6.8mm Remington SPC: Difference between revisions

6.8×43mm Remington SPC
6.8×43mm Remington SPC
	6.8 SPC (left), 5.56×45mm NATO (right)
Place of origin	United States
Production history
Designer	Remington Arms, USSOCOM
Designed	2002–2004
Specifications
Parent case	.30 Remington
Case type	Rimless, bottlenecked
Bullet diameter	0.277 in (7.0 mm)
Land diameter	0.270 in (6.9 mm)
Neck diameter	0.306 in (7.8 mm)
Shoulder diameter	0.402 in (10.2 mm)
Base diameter	0.422 in (10.7 mm)
Rim diameter	0.422 in (10.7 mm)
Rim thickness	0.049 in (1.2 mm)
Case length	1.687 in (42.8 mm)
Overall length	2.260 in (57.4 mm)
Case capacity	34.8–36.9 gr H2O (2.26–2.39 cm3)
Primer type	Large Rifle
Maximum pressure (C.I.P)	58,700 psi (405 MPa)
Maximum pressure (SAAMI)	55,000 psi (380 MPa)
Ballistic performance
	Test barrel length: 410 mm (16 in) ; Source(s):

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The 6.8mm Remington Special Purpose Cartridge (6.8 SPC, 6.8 SPC II or 6.8×43mm) is a rimless bottlenecked intermediate rifle cartridge that was developed by Remington Arms in collaboration with members of the U.S. Army Marksmanship Unit and United States Special Operations Command^[6] to possibly replace the 5.56 NATO cartridge in short barreled rifles (SBR) and carbines. Based on the .30 Remington cartridge,^[7] it is midway between the 5.56×45mm NATO and 7.62×51mm NATO in bore diameter. It uses the same diameter bullet (usually not the same mass) as the .270 Winchester hunting cartridge.

Development

The 6.8 SPC was designed to address the deficiencies of the terminal ballistics of the 5.56×45mm NATO cartridge currently in service with the armed forces of all NATO-aligned countries.^[8] The cartridge was the result of the Enhanced Rifle Cartridge Program. The 6.8 SPC (6.8×43mm) was initially developed by Master Sergeant Steve Holland and Chris Murray, a United States Army Marksmanship Unit gunsmith,^[9] to offer superior downrange lethality over the 5.56 NATO/.223 Remington in an M16-pattern service rifle with minimal loss of magazine capacity and a negligible increase in recoil.^[10]

The program started the design by using a .30 Remington case, which was modified in length to fit into magazines that would be accommodated by the magazine wells of the M16 family of rifles and carbines that are currently in service with the U.S. Armed Forces.^[11]

In tests comparing various caliber bullets using a .30 Remington parent case, Holland and Murray determined that a 6.5 mm caliber projectile had the best accuracy and penetration, with historical data going back for decades of US Army exterior and terminal ballistic testing, but a 7 mm projectile had the best terminal performance. The combination of the cartridge case, powder load, and projectile easily outperformed the 7.62×39mm and 5.45×39mm Soviet cartridges, with the new cartridge's muzzle velocity proving to be about 61 m/s (200 ft/s) faster than the 7.62 x 39.^[12]

The 6.8mm Remington SPC was designed to perform better in short-barreled CQB rifles after diminished performance from the 5.56 NATO when the M16A4 was changed from the rifle configuration to the current M4 carbine. The 6.8 SPC delivers 44% more energy than the 5.56mm NATO (M4 configuration) at 100–300 m (330–980 ft). The 6.8mm SPC is not the ballistic equal of the 7.62×51mm NATO cartridge, but it has less recoil, has been said to be more controllable in rapid fire, and is lighter, allowing operators to carry more ammunition than would otherwise be possible with the larger caliber round. The 6.8 mm generates around 2,385 J (1,759 ft⋅lbf) of muzzle energy with a 7.5-gram (115 gr) bullet. In comparison, the 5.56×45mm round (which the 6.8 is designed to replace) generates around 1,796 J (1,325 ft⋅lbf) with a 4.0 g (62 gr) bullet, giving the 6.8 mm a terminal ballistic advantage over the 5.56 mm of 588 J (434 ft⋅lbf). One of the enigmatic features of this cartridge is its being designed for a short-barrel carbine length rifle than the standard rifle length is (usually 41 cm (16 in)). The round only gains about 7.6–10.7 m/s (25–35 ft/s) for every 25 mm of barrel length past the standard 410 mm (16 in) barrel (all else being equal) up to barrel's length around 560–610 mm (22–24 in) with no gain or loss in accuracy. It also does well in rifles with less than 410 mm (16 in) barrels. In recent developments (the period 2008–2012) the performance of the 6.8 SPC has been increased by approximately 61 to 91 m/s (200 to 300 ft/s) by the work of ammunition manufacturer Silver State Armory LLC (SSA) and a few custom rifle builders using and designing the correct chamber and barrel specifications. The 6.8mm Remington SPC cartridge weighs, depending on the manufacturer and load, between 16.8 and 17.6 grams (259 and 272 gr). Also, more recently, LWRC, Magpul and Alliant Techsystems (ATK) introduced a new AR-15 designed for the 6.8 SPC which allows for a proprietary 6.8 Magpul P-mags and an overall cartridge length of 5.9 cm (2.32 in). The personal defense weapon (PDW) known as the "Six8" is SPC II w 1:250 mm (10 in) twist and is able to use all current 6.8 SPC factory ammunition.^[13]

Muzzle velocity from a 610-millimeter (24 in) barrel

7.1-gram (110 gr) Nosler Accubond	870 m/s (2,840 ft/s) – Silver State Armory (SSA)
7.5-gram (115 gr) OTM	850 m/s (2,800 ft/s) – Remington Premier Match
5.5-gram (85 gr) Nosler E-Tip	940 m/s (3,100 ft/s) – SSA
5.8-gram (90 gr) Nosler BSB	910 m/s (2,980 ft/s) – SSA
7.1-gram (110 gr) Hornady BTHP TAP	820 m/s (2,700 ft/s) – Hornady Law Enforcement "tactical" factory load
7.5-gram (115 gr) OTM (FMJ)	831 m/s (2,725 ft/s) – SSA
7.5-gram (115 gr) Boat tail hollow point (BTHP)	850 m/s (2,800 ft/s)
7.5-gram (115 gr) Sierra Match King (SMK)	850 m/s (2,800 ft/s)
7.1-gram (110 gr) Hornady V-MAX	850 m/s (2,800 ft/s)
7.1-gram (110 gr) SCHP	850 m/s (2,800 ft/s) – SSA "combat" factory load
7.1-gram (110 gr) BTHP OTM & Barnes TSX	840 m/s (2,750 ft/s) – Wilson "combat" factory load
5.5-gram (85 gr) Barnes TSX	970 m/s (3,180 ft/s) – SSA "tactical" factory load
5.8-gram (90 gr) Speer Gold Dot	930 m/s (3,050 ft/s) – Federal(ATK) "tac/mil" load

^[14]

Muzzle velocity from a 510-millimeter (20 in) barrel

7.1-gram (110 gr) Nosler Accubond	850 m/s (2,800 ft/s)- Silver State Armory (SSA)
7.5-gram (115 gr) OTM	820 m/s (2,700 ft/s)- Remington Premier Match
6.2-gram (95 gr) Barnes TTSX	880 m/s (2,880 ft/s) – Doubletap
5.8-gram (90 gr) Bonded Defense JSP	910 m/s (2,980 ft/s) – Doubletap
6.5-gram (100 gr) Nosler Accubond	855 m/s (2,805 ft/s) – Doubletap
7.1-gram (110 gr) Nosler Accubond	830 m/s (2,710 ft/s) – Doubletap
7.5-gram (115 gr) Full metal jacket boat tail	806 m/s (2,645 ft/s) – Doubletap
5.8-gram (90 gr) Speer TNT	910 m/s (2,980 ft/s)- SSA

Muzzle velocity from a 410-millimeter (16 in) barrel

7.1-gram (110 gr) Nosler Accubond	820 m/s (2,700 ft/s)- Silver State Armory (SSA)
7.5-gram (115 gr) OTM	800 m/s (2,625 ft/s)- Remington Premier Match
5.5-gram (85 gr) Barnes TSX	920 m/s (3,030 ft/s) – SSA
5.5-gram (85 gr) Nosler E-Tip	900 m/s (2,950 ft/s) – SSA
5.8-gram (90 gr) Nosler BSB	870 m/s (2,840 ft/s) – SSA
7.1-gram (110 gr) Hornady V-MAX	810 m/s (2,650 ft/s)
7.5-gram (115 gr) Sierra Match King (SMK)	810 m/s (2,650 ft/s)
7.5-gram (115 gr) OTM (FMJ)	785 m/s (2,575 ft/s) – SSA
5.5-gram (85 gr) Barnes TSX	940 m/s (3,070 ft/s) – SSA "tactical" factory load
5.8-gram (90 gr) Speer Gold Dot	880 m/s (2,900 ft/s)- Federal(ATK) "tac/mil" load
6.2-gram (95 gr) Barnes TTSX	790 m/s (2,600 ft/s) – Wilson Combat factory load^[15]
7.1-gram (110 gr) SCHP	810 m/s (2,650 ft/s) – SSA "combat" factory load
7.1-gram (110 gr) Hornady BTHP TAP	780 m/s (2,550 ft/s) – Hornady Law Enforcement "tactical" factory load^[16]
7.1-gram (110 gr) BTHP OTM & Barnes TSX	790 m/s (2,600 ft/s) – Wilson "combat" factory load^[17]
9.1-gram (140 gr) Berger VLD	732 m/s (2,401 ft/s) – SSA factory load. (Discontinued)

Comparison to other military calibers

Cartridge	Muzzle velocity	180 m (200 yd) drop	180 m (200 yd) velocity	370 m (400 yd) drop	370 m (400 yd) velocity
5.56×45mm 3.6 g (55 gr) M193	937 m/s (3,073 ft/s)	56 mm (2.2 in)	717 m/s (2,353 ft/s)	710 mm (27.8 in)	531 m/s (1,743 ft/s)
5.56×45mm 5.0 g (77 gr) OTM	817 m/s (2,679 ft/s)	84 mm (3.3 in)	675 m/s (2,216 ft/s)	830 mm (32.7 in)	550 m/s (1,810 ft/s)
6.8×43mm SPC 7.5 g (115 gr) SMK	810 m/s (2,650 ft/s)	89 mm (3.5 in)	653 m/s (2,143 ft/s)	900 mm (35.4 in)	511 m/s (1,677 ft/s)
6.8×43mm SPC 7.1 g (110 gr) V-MAX	810 m/s (2,650 ft/s)	84 mm (3.3 in)	673 m/s (2,208 ft/s)	790 mm (31.1 in)	552 m/s (1,811 ft/s)
7.62×39mm	700 m/s (2,300 ft/s)	84 mm (3.3 in)	545 m/s (1,787 ft/s)	1,370 mm (53.8 in)	404 m/s (1,324 ft/s)
7.62×51mm 10.9 g (168 gr) SMK	790 m/s (2,600 ft/s)	86 mm (3.4 in)	681 m/s (2,235 ft/s)	820 mm (32.3 in)	576 m/s (1,891 ft/s)

Typical trajectory information from carbines with drop and velocity calculated at sea level with a 91 m (100 yd) zero.^[18]

Applications

Military and law enforcement adoption

By late 2004 the 6.8×43mm SPC was said ^{[by whom?]} to be performing well in the field against enemy combatants in special operations. However the cartridge was not used by conventional US military personnel. It was not adopted for widespread use due to resistance from officials.^[19] The 6.8 SPC was designed for better terminal effectiveness at the shorter ranges of urban combat experienced in Iraq. When fighting in Afghanistan began to intensify, engagements began taking place at greater distances, where the 6.8 SPC begins to falter. Experiments suggested that the comparatively short 6.8 mm bullets became ineffective at longer ranges.^[20] In 2007, both the U.S. SOCOM and the U.S. Marine Corps decided not to field weapons chambered in 6.8 mm due to logistical and cost issues.^[21]

While there are many rumors of evaluations of the cartridge by several major federal and local law enforcement agencies, the US Drug Enforcement Administration has allowed individual agents to purchase the M6A2 D-DEA – which uses the 6.8mm Remington SPC – as an authorized alternative to their duty weapon. In 2010 the Jordanian state-owned arms manufacturer KADDB announced that they would be producing 6.8 mm rifles and carbines for the Jordanian Army.^[22] There is also a contract between LWRC, Magpul, Alliant Techsystems and the Saudi Royal Guard for around 36,000 Six8 PDWs and an undisclosed amount of ATK/Federal XD68GD (90gr Gold Dot "training" ammo) and proprietary Magpul 6.8 Pmags specifically for the LWRC Six8.

Semiautomatic action

The first major manufacturer to offer a 6.8mm Remington SPC-chambered version of the AR-15 was Barrett Firearms Company, offering the Barrett M468 and later the REC7. By 2007, most major manufacturers of AR-15-type rifles for the civilian gun market were offering rifles in this caliber. Dedicated AR upper receiver assemblies chambered for the round are produced by a number of smaller firms, including Daniel Defense. Ruger Firearms no longer produces a 6.8 mm for their Ruger SR-556 piston-driven AR-15 variant.^[23] The Stag Arms hunter and tactical models utilize the newer chamber (SPC II) and specified twist rates to accommodate higher pressure loadings, as well as upper receivers in left-handed configurations. Rock River Arms has an LAR-6.8 X Series rifle and uppers. Microtech Small Arms Research offers their version of the Steyr AUG in 6.8. Robinson Armament Co. offers the XCR-L in 6.8, which can be easily converted between 6.8, 5.56, and 7.62×39. Bushmaster delivered a 6.8 SPC II conversion kit to the market as of October 2018. Ruger Firearms chambered their Mini-14 ranch rifle in this round for several years; however, it has been discontinued.

Notes

^ ^a ^b ^c "C.I.P. TDCC sheet 6,8 Rem. SPC" (PDF). Archived (PDF) from the original on 2018-04-13. Retrieved 2022-02-06.
^ "Silver State Armory specializes in 6.8 SPC Ammunition, 115gr OTM, and custom brass cases – 6.8 Ammunition, 6.8 SPC Ammunition, SSarmory.com, SilverStateArmory.com". Ssarmory.com. Archived from the original on 2011-10-28. Retrieved 2011-09-15.
^ "Hornady Manufacturing Company :: Ammunition :: Rifle :: Choose by Caliber :: 6.8mm SPC :: 6.8mm SPC 120 GR SST". Hornady.com. Archived from the original on 2011-09-29. Retrieved 2011-09-15.
^ "6.8 SPC 110 grain Sierra Pro Hunter Ammunition, 20 rounds/box., SilverStateArmory.com". Ssarmory.com. Archived from the original on 2012-05-22. Retrieved 2012-05-26.
^ "Not So Special: A Critical View of the 6.8mm SPC -". 4 April 2015.
^ Not a private endeavor or fully sanctioned government project
^ "30 Rem". Chuckhawks.com. Retrieved 2011-09-15.
^ John Pike. "5.56-mm Cartridges". Globalsecurity.org. Retrieved 2011-09-15.
^ "6.8 Project". Wilson Combat. Archived from the original on 2015-05-04. Retrieved 2015-03-21.
^ "6.8 mm SPC Cartridge History & Development. Hornady's Ammunition. The Stag Carbine". Demigodllc.com. 2006-07-31. Retrieved 2011-09-15.
^ Paul, Gary (2011-01-04). "The 6.8mm Remington SPC". Rifleshootermag.com. Archived from the original on 2010-11-24. Retrieved 2011-09-15.
^ "6.8 mm SPC Cartridge History & Development. Hornady's Ammunition. The Stag Carbine". Demigodllc.com. Retrieved 2011-09-15.
^ Fortier, David M. "LWRCI's Great SIX8" (PDF). Archived from the original (PDF) on 2014-02-21. Retrieved 2014-02-10.
^ "DTIC.mil". Archived from the original on 2011-06-29. Retrieved 2011-09-15.
^ "6.8 SPC WC Ammo".
^ "Hornady : Law Enforcement | Products | 6.8MM SPC - 6.8MM SPC 110gr. V-MAX?". Archived from the original on 2012-04-23. Retrieved 2012-05-18.
^ "110 gr. Hornady BTHP, 2600 FPS - 16" Barrel-Wilson Combat". Shopwilsoncombat.com. Retrieved 2011-09-15.
^ "6.8mm SPC article". Demigodllc.com. Retrieved 2011-09-15.
^ Another 7.62mm Bullet For M-16s – Strategypage.com, 8 January 2012
^ The 6.5×40 Cartridge: Longer Reach for the M4 & M16 – SAdefensejournal.com, 26 March 2014
^ Dan Lamothe. "Corps to pass on Army upgrades to M4". Army Times Publishing Company. Archived from the original on 2010-09-25. Retrieved 11 September 2010.
^ "LWRC rifles to be license-produced in Jordan". Thefirearmblog.com. 2010-05-13. Retrieved 2011-09-15.
^ "Information on the 6.8 SPC Mini". Ruger-firearms.com. Retrieved 2011-09-15.

External links

Definitive history of 6.8 SPC- The 6.8 SPC, Is it all that?
6.8 SPC FAQ
Remington Ammunition Information Archived 2007-09-30 at the Wayback Machine
M468 Rifle Archived 2019-06-16 at the Wayback Machine
Defense Review
Gunblast.com article
Sharper Shooting: Upgrading Ammunition Lethality
First Look: The 6.8mm Remington SPC

[cip-1] "C.I.P. TDCC sheet 6,8 Rem. SPC" (PDF). Archived (PDF) from the original on 2018-04-13. Retrieved 2022-02-06.

[2] "Silver State Armory specializes in 6.8 SPC Ammunition, 115gr OTM, and custom brass cases – 6.8 Ammunition, 6.8 SPC Ammunition, SSarmory.com, SilverStateArmory.com". Ssarmory.com. Archived from the original on 2011-10-28. Retrieved 2011-09-15.

[3] "Hornady Manufacturing Company :: Ammunition :: Rifle :: Choose by Caliber :: 6.8mm SPC :: 6.8mm SPC 120 GR SST". Hornady.com. Archived from the original on 2011-09-29. Retrieved 2011-09-15.

[4] "6.8 SPC 110 grain Sierra Pro Hunter Ammunition, 20 rounds/box., SilverStateArmory.com". Ssarmory.com. Archived from the original on 2012-05-22. Retrieved 2012-05-26.

[5] "Not So Special: A Critical View of the 6.8mm SPC -". 4 April 2015.

[6] Not a private endeavor or fully sanctioned government project

[7] "30 Rem". Chuckhawks.com. Retrieved 2011-09-15.

[globalsecurity1-8] John Pike. "5.56-mm Cartridges". Globalsecurity.org. Retrieved 2011-09-15.

[9] "6.8 Project". Wilson Combat. Archived from the original on 2015-05-04. Retrieved 2015-03-21.

[10] "6.8 mm SPC Cartridge History & Development. Hornady's Ammunition. The Stag Carbine". Demigodllc.com. 2006-07-31. Retrieved 2011-09-15.

[11] Paul, Gary (2011-01-04). "The 6.8mm Remington SPC". Rifleshootermag.com. Archived from the original on 2010-11-24. Retrieved 2011-09-15.

[12] "6.8 mm SPC Cartridge History & Development. Hornady's Ammunition. The Stag Carbine". Demigodllc.com. Retrieved 2011-09-15.

[13] Fortier, David M. "LWRCI's Great SIX8" (PDF). Archived from the original (PDF) on 2014-02-21. Retrieved 2014-02-10.

[autogeneratedmil-14] "DTIC.mil". Archived from the original on 2011-06-29. Retrieved 2011-09-15.

[15] "6.8 SPC WC Ammo".

[16] "Hornady : Law Enforcement | Products | 6.8MM SPC - 6.8MM SPC 110gr. V-MAX?". Archived from the original on 2012-04-23. Retrieved 2012-05-18.

[17] "110 gr. Hornady BTHP, 2600 FPS - 16" Barrel-Wilson Combat". Shopwilsoncombat.com. Retrieved 2011-09-15.

[18] "6.8mm SPC article". Demigodllc.com. Retrieved 2011-09-15.

[19] Another 7.62mm Bullet For M-16s – Strategypage.com, 8 January 2012

[20] The 6.5×40 Cartridge: Longer Reach for the M4 & M16 – SAdefensejournal.com, 26 March 2014

[21] Dan Lamothe. "Corps to pass on Army upgrades to M4". Army Times Publishing Company. Archived from the original on 2010-09-25. Retrieved 11 September 2010.

[22] "LWRC rifles to be license-produced in Jordan". Thefirearmblog.com. 2010-05-13. Retrieved 2011-09-15.

[23] "Information on the 6.8 SPC Mini". Ruger-firearms.com. Retrieved 2011-09-15.

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@@ Line 12: / Line 12: @@
 | case_type = [[Rimless]], bottlenecked
 | bullet = 0.277
-| land = {{convert|0.270|in|mm|abbr=on}}<ref name="cip">{{Cite web |url=http://www.cip-bobp.org/homologation/uploads/tdcc/tab-i/tabical-en-page31.pdf |title=C.I.P. TDCC sheet 6,8 Rem. SPC |access-date=2022-02-06 |archive-url=https://web.archive.org/web/20180413143509/https://www.cip-bobp.org/homologation/uploads/tdcc/tab-i/tabical-en-page31.pdf |archive-date=2018-04-18 |url-status=live}}</ref>
+| land = {{convert|0.270|in|mm|abbr=on}}<ref name="cip">{{Cite web |url=http://www.cip-bobp.org/homologation/uploads/tdcc/tab-i/tabical-en-page31.pdf |title=C.I.P. TDCC sheet 6,8 Rem. SPC |access-date=2022-02-06 |archive-url=https://web.archive.org/web/20180413143509/https://www.cip-bobp.org/homologation/uploads/tdcc/tab-i/tabical-en-page31.pdf |archive-date=2018-04-13 |url-status=live}}</ref>
 | neck = 0.306
 | shoulder = 0.402
@@ Line 22: / Line 22: @@
 | case_capacity = 34.8-36.9
 | rifling =
-| primer =
+| primer = Large Rifle
 | max_pressure = 58700
 | pressure_method = C.I.P
@@ Line 47: / Line 47: @@
 <!-- Ballistics data source -->
 | test_barrel_length = {{convert|16|in|order=flip|abbr=on}}
-<ref>{{cite web |url=http://www.ssarmory.com/6.8_spc_ammo_115gr_OTM.aspx |title=Silver State Armory specializes in 6.8 SPC Ammunition, 115gr OTM, and custom brass cases – 6.8 Ammunition, 6.8 SPC Ammunition, SSarmory.com, SilverStateArmory.com |publisher=Ssarmory.com |access-date=2011-09-15 |archive-date=2011-10-28 |archive-url=https://web.archive.org/web/20111028232233/http://www.ssarmory.com/6.8_spc_ammo_115gr_OTM.aspx |url-status=dead }}</ref><ref>{{cite web |url=http://www.hornady.com/store/6.8mm-SPC-120-GR-SST/ |title=Hornady Manufacturing Company :: Ammunition :: Rifle :: Choose by Caliber :: 6.8mm SPC :: 6.8mm SPC 120 GR SST® |publisher=Hornady.com |access-date=2011-09-15 |archive-url=https://web.archive.org/web/20110929212504/http://www.hornady.com/store/6.8mm-SPC-120-GR-SST |archive-date=2011-09-29 |url-status=dead }}</ref><ref>{{cite web|url=http://www.ssarmory.com/6.8_spc_ammo-2-1-1-1-1.aspx|title=6.8 SPC 110 grain Sierra Pro Hunter Ammunition, 20 rounds/box., SilverStateArmory.com|publisher=Ssarmory.com|access-date=2012-05-26|archive-date=2012-05-22|archive-url=https://web.archive.org/web/20120522080429/http://www.ssarmory.com/6.8_spc_ammo-2-1-1-1-1.aspx|url-status=dead}}</ref>
+<ref>{{cite web |url=http://www.ssarmory.com/6.8_spc_ammo_115gr_OTM.aspx |title=Silver State Armory specializes in 6.8 SPC Ammunition, 115gr OTM, and custom brass cases – 6.8 Ammunition, 6.8 SPC Ammunition, SSarmory.com, SilverStateArmory.com |publisher=Ssarmory.com |access-date=2011-09-15 |archive-date=2011-10-28 |archive-url=https://web.archive.org/web/20111028232233/http://www.ssarmory.com/6.8_spc_ammo_115gr_OTM.aspx |url-status=dead }}</ref><ref>{{cite web |url=http://www.hornady.com/store/6.8mm-SPC-120-GR-SST/ |title=Hornady Manufacturing Company :: Ammunition :: Rifle :: Choose by Caliber :: 6.8mm SPC :: 6.8mm SPC 120 GR SST |publisher=Hornady.com |access-date=2011-09-15 |archive-url=https://web.archive.org/web/20110929212504/http://www.hornady.com/store/6.8mm-SPC-120-GR-SST |archive-date=2011-09-29 |url-status=dead }}</ref><ref>{{cite web|url=http://www.ssarmory.com/6.8_spc_ammo-2-1-1-1-1.aspx|title=6.8 SPC 110 grain Sierra Pro Hunter Ammunition, 20 rounds/box., SilverStateArmory.com|publisher=Ssarmory.com|access-date=2012-05-26|archive-date=2012-05-22|archive-url=https://web.archive.org/web/20120522080429/http://www.ssarmory.com/6.8_spc_ammo-2-1-1-1-1.aspx|url-status=dead}}</ref>
 |vel4=3070|en4=1780|bw4=5.5 [[Gram|g]] (85 [[Grain (unit)|gr]])|btype4=Barnes TSX with "tactical" factory SSA load
 | balsrc = <ref>{{Cite web|url=http://www.thefirearmblog.com/blog/2015/04/04/not-so-special-a-critical-view-of-the-6-8mm-spc/|title = Not So Special: A Critical View of the 6.8mm SPC -|date = 4 April 2015}}</ref>
@@ Line 55: / Line 55: @@
 == Development ==
-The 6.8mm SPC [[Cartridge (firearms)|cartridge]] was designed to address the deficiencies of the [[terminal ballistics]] of the [[5.56×45mm NATO]] cartridge currently in service with the armed forces of all [[NATO]]-aligned countries.<ref name="globalsecurity1">{{cite web|author=John Pike |url=http://www.globalsecurity.org/military/systems/munitions/68spc.htm |title=5.56-mm Cartridges |publisher=Globalsecurity.org |access-date=2011-09-15}}</ref> The cartridge was the result of the Enhanced Rifle Cartridge Program. The 6.8 SPC (6.8×43mm) was initially developed by Master Sergeant Steve Holland and Chris Murray, a United States Army Marksmanship Unit gunsmith,<ref>{{Cite web |url=http://www.wilsoncombat.com/68project.htm |title=Archived copy |access-date=2015-03-21 |archive-url=https://web.archive.org/web/20150504000240/http://www.wilsoncombat.com/68project.htm |archive-date=2015-05-04 |url-status=dead }}</ref> to offer superior downrange lethality over the 5.56 NATO/.223 Remington in an M16-pattern service rifle with minimal loss of magazine capacity and a negligible increase in recoil.<ref>{{cite web|url=http://demigodllc.com/articles/6.8-mm-spc-cartridge-history-development-hornady-stag-arms-carbine/ |title=6.8 mm SPC Cartridge History & Development. Hornady's Ammunition. The Stag Carbine |publisher=Demigodllc.com |date=2006-07-31 |access-date=2011-09-15}}</ref>
+The 6.8 SPC was designed to address the deficiencies of the [[terminal ballistics]] of the [[5.56×45mm NATO]] cartridge currently in service with the armed forces of all [[NATO]]-aligned countries.<ref name="globalsecurity1">{{cite web|author=John Pike |url=http://www.globalsecurity.org/military/systems/munitions/68spc.htm |title=5.56-mm Cartridges |publisher=Globalsecurity.org |access-date=2011-09-15}}</ref> The cartridge was the result of the Enhanced Rifle Cartridge Program. The 6.8 SPC (6.8×43mm) was initially developed by Master Sergeant Steve Holland and Chris Murray, a United States Army Marksmanship Unit gunsmith,<ref>{{Cite web |url=http://www.wilsoncombat.com/68project.htm |title=6.8 Project |publisher=Wilson Combat |access-date=2015-03-21 |archive-url=https://web.archive.org/web/20150504000240/http://www.wilsoncombat.com/68project.htm |archive-date=2015-05-04 |url-status=dead }}</ref> to offer superior downrange lethality over the 5.56 NATO/.223 Remington in an M16-pattern service rifle with minimal loss of magazine capacity and a negligible increase in recoil.<ref>{{cite web|url=http://demigodllc.com/articles/6.8-mm-spc-cartridge-history-development-hornady-stag-arms-carbine/ |title=6.8 mm SPC Cartridge History & Development. Hornady's Ammunition. The Stag Carbine |publisher=Demigodllc.com |date=2006-07-31 |access-date=2011-09-15}}</ref>
-The program started the design by using a .30 Remington case, which was modified in length to fit into [[Magazine (firearms)|magazines]] that would be accommodated by the magazine wells of the [[M16 rifle|M16]] family of rifles and carbines that are currently in service with the U.S. Armed Forces.<ref>{{cite web |last=Paul |first=Gary |url=http://www.rifleshootermag.com/ammunition/remington_0303/ |title=The 6.8mm Remington SPC |publisher=Rifleshootermag.com |date=2011-01-04 |access-date=2011-09-15 |archive-url=https://web.archive.org/web/20101124220935/http://www.rifleshootermag.com/ammunition/remington_0303/ |archive-date=2010-11-24 |url-status=dead }}</ref>
+The program started the design by using a [[.30 Remington]] case, which was modified in length to fit into [[Magazine (firearms)|magazines]] that would be accommodated by the magazine wells of the [[M16 rifle|M16]] family of rifles and carbines that are currently in service with the U.S. Armed Forces.<ref>{{cite web |last=Paul |first=Gary |url=http://www.rifleshootermag.com/ammunition/remington_0303/ |title=The 6.8mm Remington SPC |publisher=Rifleshootermag.com |date=2011-01-04 |access-date=2011-09-15 |archive-url=https://web.archive.org/web/20101124220935/http://www.rifleshootermag.com/ammunition/remington_0303/ |archive-date=2010-11-24 |url-status=dead }}</ref>
-In tests comparing various caliber bullets using a [[.30 Remington]] parent case, Holland and Murray determined that a 6.5&nbsp;mm [[caliber]] projectile had the best accuracy and penetration, with historical data going back for decades of [[United States Army|US Army]] exterior and terminal ballistic testing, but a 7&nbsp;mm projectile had the best terminal performance. The combination of the cartridge case, powder load, and projectile easily outperformed the [[7.62×39mm]] and [[5.45×39mm]] Soviet cartridges, with the new cartridge's muzzle velocity proving to be about {{convert|200|ft/s|abbr=on|order=flip}} faster than the 7.62 x 39.<ref>{{cite web|url=http://demigodllc.com/articles/6.8-mm-spc-cartridge-history-development-hornady-stag-arms-carbine/?p=2 |title=6.8 mm SPC Cartridge History & Development. Hornady's Ammunition. The Stag Carbine |publisher=Demigodllc.com |access-date=2011-09-15}}</ref>
+In tests comparing various caliber bullets using a .30 Remington parent case, Holland and Murray determined that a 6.5&nbsp;mm [[caliber]] projectile had the best accuracy and penetration, with historical data going back for decades of [[United States Army|US Army]] exterior and terminal ballistic testing, but a 7&nbsp;mm projectile had the best terminal performance. The combination of the cartridge case, powder load, and projectile easily outperformed the [[7.62×39mm]] and [[5.45×39mm]] Soviet cartridges, with the new cartridge's muzzle velocity proving to be about {{convert|200|ft/s|abbr=on|order=flip}} faster than the 7.62 x 39.<ref>{{cite web|url=http://demigodllc.com/articles/6.8-mm-spc-cartridge-history-development-hornady-stag-arms-carbine/?p=2 |title=6.8 mm SPC Cartridge History & Development. Hornady's Ammunition. The Stag Carbine |publisher=Demigodllc.com |access-date=2011-09-15}}</ref>
 The 6.8mm Remington SPC was designed to perform better in short-barreled [[Close Quarters Battle|CQB]] rifles after diminished performance from the 5.56 NATO when the M16A4 was changed from the rifle configuration to the current [[M4 carbine]]. The 6.8 SPC delivers 44% more energy than the 5.56mm NATO (M4 configuration) at {{convert|100|-|300|m|abbr=on}}. The 6.8mm SPC is not the ballistic equal of the 7.62×51mm NATO cartridge, but it has less recoil, has been said to be more controllable in rapid fire, and is lighter, allowing operators to carry more ammunition than would otherwise be possible with the larger caliber round. The 6.8&nbsp;mm generates around {{convert|1759|ftlbf|J|abbr=on|order=flip}} of muzzle energy with a {{convert|115|gr|adj=on|order=flip}} bullet. In comparison, the 5.56×45mm round (which the 6.8 is designed to replace) generates around {{convert|1325|ftlbf|J|abbr=on|order=flip}} with a {{convert|62|gr|adj=on|abbr=on|order=flip}} bullet, giving the 6.8&nbsp;mm a terminal ballistic advantage over the 5.56&nbsp;mm of {{convert|434|ftlbf|J|abbr=on|order=flip}}.
-One of the enigmatic features of this cartridge is its being designed for a short-barrel carbine length rifle than the standard rifle length is (usually {{convert|16|in|cm|abbr=on|order=flip}}). The round only gains about {{convert|25|-|35|ft/s|m/s|abbr=on|order=flip}} for every 25&nbsp;mm of barrel length past the standard {{convert|16|in|order=flip|adj=on|abbr=on}} barrel (all else being equal) up to barrel's length around {{convert|22|-|24|in|abbr=on|order=flip}} with no gain or loss in accuracy. It also does well in rifles with less than {{convert|16|in|order=flip|abbr=on}} barrels. In recent developments (the period 2008–2012) the performance of the 6.8 SPC has been increased by approximately {{convert|200|to|300|ft/s|m/s|abbr=on|order=flip}} by the work of ammunition manufacturer Silver State Armory LLC (SSA) and a few custom rifle builders using and designing the correct chamber and barrel specifications. The 6.8mm Remington SPC cartridge weighs, depending on the manufacturer and load, between {{convert|16.8|and|17.6|g|gr}}. Also, more recently, [[LWRC]], [[Magpul]] and [[Alliant Techsystems]] (ATK) introduced a new AR-15 designed for the 6.8 SPC which allows for a proprietary 6.8 Magpul P-mags and an overall cartridge length of {{convert|2.32|in|cm|order=flip|abbr=on}}. The personal defense weapon (PDW) known as the "[[LWRC M6#Six8|Six8]]" is SPC II w 1:{{convert|10|in|order=flip|abbr=on}} twist and is able to use all current 6.8 SPC factory ammunition.<ref>{{Cite web |url=https://www.lwrci.com/articles/SGNLWRCsix8.pdf |title=Archived copy |access-date=2014-02-10 |archive-url=https://web.archive.org/web/20140221182650/https://www.lwrci.com/articles/SGNLWRCsix8.pdf |archive-date=2014-02-21 |url-status=dead }}</ref>
+One of the enigmatic features of this cartridge is its being designed for a short-barrel carbine length rifle than the standard rifle length is (usually {{convert|16|in|cm|abbr=on|order=flip}}). The round only gains about {{convert|25|-|35|ft/s|m/s|abbr=on|order=flip}} for every 25&nbsp;mm of barrel length past the standard {{convert|16|in|order=flip|adj=on|abbr=on}} barrel (all else being equal) up to barrel's length around {{convert|22|-|24|in|abbr=on|order=flip}} with no gain or loss in accuracy. It also does well in rifles with less than {{convert|16|in|order=flip|abbr=on}} barrels. In recent developments (the period 2008–2012) the performance of the 6.8 SPC has been increased by approximately {{convert|200|to|300|ft/s|m/s|abbr=on|order=flip}} by the work of ammunition manufacturer Silver State Armory LLC (SSA) and a few custom rifle builders using and designing the correct chamber and barrel specifications. The 6.8mm Remington SPC cartridge weighs, depending on the manufacturer and load, between {{convert|16.8|and|17.6|g|gr}}. Also, more recently, [[LWRC]], [[Magpul]] and [[Alliant Techsystems]] (ATK) introduced a new AR-15 designed for the 6.8 SPC which allows for a proprietary 6.8 Magpul P-mags and an overall cartridge length of {{convert|2.32|in|cm|order=flip|abbr=on}}. The personal defense weapon (PDW) known as the "[[LWRC M6#Six8|Six8]]" is SPC II w 1:{{convert|10|in|order=flip|abbr=on}} twist and is able to use all current 6.8 SPC factory ammunition.<ref>{{Cite web |url=https://www.lwrci.com/articles/SGNLWRCsix8.pdf |title=LWRCI's Great SIX8 |first=David M. |last=Fortier |access-date=2014-02-10 |archive-url=https://web.archive.org/web/20140221182650/https://www.lwrci.com/articles/SGNLWRCsix8.pdf |archive-date=2014-02-21 |url-status=dead }}</ref>
 === Muzzle velocity from a {{convert|24|in|mm|adj=on|order=flip|sp=us}} barrel ===
@@ Line 117: / Line 117: @@
 |{{convert|2645|ft/s|abbr=on|order=flip}} –  Doubletap
 |-
-|{{convert|90|gr|adj=on|order=flip}}    Speer® TNT
+|{{convert|90|gr|adj=on|order=flip}}    Speer TNT
 |{{convert|2980|ft/s|abbr=on|order=flip}}- SSA
 |}
@@ Line 160: / Line 160: @@
 |-
 |{{convert|110|gr|adj=on|order=flip}} Hornady BTHP TAP
-|{{convert|2550|ft/s|abbr=on|order=flip}} – Hornady Law Enforcement "tactical" factory load<ref>{{Cite web|title=Hornady : Law Enforcement &#124; Products &#124; 6.8MM SPC - 6.8MM SPC 110gr. V-MAX?|url=http://www.hornadyle.com/products/more_detail0a5d.html?id=72&sID=151&pID=1|url-status=dead|archive-url=https://web.archive.org/web/20120423104633/http://www.hornadyle.com/products/more_detail0a5d.html?id=72&sID=151&pID=1|archive-date=2012-04-23|access-date=2012-05-18}}</ref>
+|{{convert|2550|ft/s|abbr=on|order=flip}} – Hornady Law Enforcement "tactical" factory load<ref>{{Cite web|title=Hornady : Law Enforcement {{pipe}} Products {{pipe}} 6.8MM SPC - 6.8MM SPC 110gr. V-MAX?|url=http://www.hornadyle.com/products/more_detail0a5d.html?id=72&sID=151&pID=1|url-status=dead|archive-url=https://web.archive.org/web/20120423104633/http://www.hornadyle.com/products/more_detail0a5d.html?id=72&sID=151&pID=1|archive-date=2012-04-23|access-date=2012-05-18}}</ref>
 |-
 |{{convert|110|gr|adj=on|order=flip}} BTHP OTM & Barnes TSX
@@ Line 227: / Line 227: @@
 ==Applications==
 ===Military and law enforcement adoption===
-By late 2004 the 6.8×43mm SPC was said to be performing well in the field against enemy combatants in [[special operations]].<ref name="globalsecurity1"/> However the cartridge was not used by conventional US military personnel.  It was not adopted for widespread use due to resistance from officials.<ref>[https://www.strategypage.com/dls/articles/Another-7.62mm-Bullet-For-M-16s-1-8-2012.asp Another 7.62mm Bullet For M-16s] – Strategypage.com, 8 January 2012</ref> The 6.8 SPC was designed for better terminal effectiveness at the shorter ranges of urban combat experienced in Iraq.  When fighting in Afghanistan began to intensify, engagements began taking place at greater distances, where the 6.8 SPC begins to falter.  Experiments suggested that the comparatively short 6.8&nbsp;mm bullets became ineffective at longer ranges.<ref>[http://sadefensejournal.com/wp/?p=2414 The 6.5×40 Cartridge: Longer Reach for the M4 & M16] – SAdefensejournal.com, 26 March 2014</ref> In 2007, both the [[U.S. SOCOM]] and the [[U.S. Marine Corps]] decided not to field weapons chambered in 6.8&nbsp;mm due to logistical and cost issues.<ref>{{cite web |title= Corps to pass on Army upgrades to M4 |url= http://marinecorpstimes.com/news/2010/09/marine-corps-passes-on-army-carbine-updates-091110w/ |publisher= Army Times Publishing Company |access-date= 11 September 2010 |author= Dan Lamothe |archive-url= https://web.archive.org/web/20100925141339/http://www.marinecorpstimes.com/news/2010/09/marine-corps-passes-on-army-carbine-updates-091110w/ |archive-date= 2010-09-25 |url-status= dead }}</ref>
+By late 2004 the 6.8×43mm SPC was said {{By whom|date=November 2023}} to be performing well in the field against enemy combatants in [[special operations]]. However the cartridge was not used by conventional US military personnel.  It was not adopted for widespread use due to resistance from officials.<ref>[https://www.strategypage.com/dls/articles/Another-7.62mm-Bullet-For-M-16s-1-8-2012.asp Another 7.62mm Bullet For M-16s] – Strategypage.com, 8 January 2012</ref> The 6.8 SPC was designed for better terminal effectiveness at the shorter ranges of urban combat experienced in Iraq.  When fighting in Afghanistan began to intensify, engagements began taking place at greater distances, where the 6.8 SPC begins to falter.  Experiments suggested that the comparatively short 6.8&nbsp;mm bullets became ineffective at longer ranges.<ref>[http://sadefensejournal.com/wp/?p=2414 The 6.5×40 Cartridge: Longer Reach for the M4 & M16] – SAdefensejournal.com, 26 March 2014</ref> In 2007, both the [[U.S. SOCOM]] and the [[U.S. Marine Corps]] decided not to field weapons chambered in 6.8&nbsp;mm due to logistical and cost issues.<ref>{{cite web |title= Corps to pass on Army upgrades to M4 |url= http://marinecorpstimes.com/news/2010/09/marine-corps-passes-on-army-carbine-updates-091110w/ |publisher= Army Times Publishing Company |access-date= 11 September 2010 |author= Dan Lamothe |archive-url= https://web.archive.org/web/20100925141339/http://www.marinecorpstimes.com/news/2010/09/marine-corps-passes-on-army-carbine-updates-091110w/ |archive-date= 2010-09-25 |url-status= dead }}</ref>
 While there are many rumors of evaluations of the cartridge by several major federal and local law enforcement agencies, the [[US Drug Enforcement Administration]] has allowed individual agents to purchase the [[LWRC M6#Six8|M6A2 D-DEA]] – which uses the 6.8mm Remington SPC – as an authorized alternative to their duty weapon.  In 2010 the Jordanian state-owned arms manufacturer KADDB announced that they would be producing 6.8&nbsp;mm rifles and carbines for the [[Jordanian Army]].<ref>{{cite web|url=http://www.thefirearmblog.com/blog/2010/05/13/lwrc-rifles-to-be-license-produced-in-jordan/ |title=LWRC rifles to be license-produced in Jordan |publisher=Thefirearmblog.com |date=2010-05-13 |access-date=2011-09-15}}</ref>  There is also a contract between [[LWRC]], [[Magpul]], [[Alliant Techsystems]] and the Saudi Royal Guard for around 36,000 Six8 PDWs and an undisclosed amount of ATK/Federal XD68GD (90gr Gold Dot "training" ammo) and proprietary Magpul 6.8 Pmags specifically for the [[LWRC M6#Six8|LWRC Six8]].
 ====Semiautomatic action====
-The first major manufacturer to offer a 6.8mm Remington SPC-chambered version of the [[AR-15]] was [[Barrett Firearms Company]], offering the [[Barrett M468]] and later the [[REC7]].  By 2007, most major manufacturers of AR-15-type rifles for the civilian gun market were offering rifles in this caliber. Dedicated AR upper receiver assemblies chambered for the round are produced by a number of smaller firms, including Daniel Defense.  Ruger Firearms no longer produces a 6.8&nbsp;mm for their [[Ruger SR-556]] piston-driven AR-15 variant.<ref>{{cite web|url=http://www.ruger-firearms.com/Firearms/FAProdView?model=5814&return=Y |title=Information on the 6.8 SPC Mini |publisher=Ruger-firearms.com |access-date=2011-09-15}}</ref> The [[Stag Arms]] hunter and tactical models utilize the newer chamber (SPC II) and specified twist rates to accommodate higher pressure loadings, as well as upper receivers in left-handed configurations. Rock River Arms has an LAR-6.8 X Series rifle and uppers. [[Microtech Small Arms Research]] offers their version of the [[Steyr AUG]] in 6.8. [[Robinson Armament Co.]] offers the XCR-L in 6.8, which can be easily converted between 6.8, 5.56, and 7.62×39. [[Bushmaster Firearms International|Bushmaster]] delivered a 6.8 SPC II conversion kit to the market as of October 2018.  Ruger Firearms chambered their Mini-14 ranch rifle in this round for several years; however, it has been discontinued.
+The first major manufacturer to offer a 6.8mm Remington SPC-chambered version of the [[AR-15]] was [[Barrett Firearms Company]], offering the [[Barrett M468]] and later the [[REC7]].  By 2007, most major manufacturers of AR-15-type rifles for the civilian gun market were offering rifles in this caliber. Dedicated AR upper receiver assemblies chambered for the round are produced by a number of smaller firms, including Daniel Defense.  Ruger Firearms no longer produces a 6.8&nbsp;mm for their [[Ruger SR-556]] piston-driven AR-15 variant.<ref>{{cite web|url=http://www.ruger-firearms.com/Firearms/FAProdView?model=5814&return=Y |title=Information on the 6.8 SPC Mini |publisher=Ruger-firearms.com |access-date=2011-09-15}}</ref> The [[Stag Arms]] hunter and tactical models utilize the newer chamber (SPC II) and specified twist rates to accommodate higher pressure loadings, as well as upper receivers in left-handed configurations. Rock River Arms has an LAR-6.8 X Series rifle and uppers. [[Microtech Small Arms Research]] offers their version of the [[Steyr AUG]] in 6.8. [[Robinson Armament Co.]] offers the XCR-L in 6.8, which can be easily converted between 6.8, 5.56, and 7.62×39. [[Bushmaster Firearms International|Bushmaster]] delivered a 6.8 SPC II conversion kit to the market as of October 2018.  Ruger Firearms chambered their [[Mini-14]] ranch rifle in this round for several years; however, it has been discontinued.
 == See also ==
-* [[.224 Valkyrie]] – 6.8 SPC derivative cartridge
+* [[.224 Valkyrie]], 6.8 SPC derivative cartridge
+* [[6mm ARC]]
-* [[6 mm caliber]] and [[7 mm caliber]] — other cartridges of similar size
-* [[6mm SAW]] — similar cartridge developed to approximate both 7.62×51mm and 5.56×45mm cartridges
+* [[6mm SAW]], similar cartridge developed to approximate both 7.62×51mm and 5.56×45mm cartridges
-* [[.280 British]] — similar cartridge developed during the 1940s in the UK
+* [[.277 Fury]]
+* [[.280 British]], similar cartridge developed during the 1940s in the UK
-* [[.276 Pedersen]] — similar cartridge developed in 1923 in the US
+* [[.276 Pedersen]], similar cartridge developed in 1923 in the US
-* [[.277 Wolverine]] — 6.8mm AR-15 wildcat based on [[5.56×45mm]] case
+* [[.277 Wolverine]], 6.8mm AR-15 wildcat based on [[5.56×45mm]] case
 * [[List of AR platform cartridges]]
 * [[List of individual weapons of the U.S. Armed Forces]]
@@ Line 257: / Line 258: @@
 * [https://web.archive.org/web/20090218084936/http://rifleshootermag.com/ammunition/remington_0303/ First Look: The 6.8mm Remington SPC]
+{{Intermediate cartridges}}
 {{30Remington}}

v t e Intermediate cartridges
LE & Paramilitary	.22 Spitfire .221 Remington Fireball .300 AAC Blackout .375 SOCOM .450 Bushmaster .45 Raptor .458 HAM'R .458 SOCOM .50 Beowulf .500 Auto Max 6.5mm Grendel 7.62×37mm Musang 7.62×45mm Pindad 8.6 mm Blackout 9×39mm .510 Whisper
Service issue	5.45×39mm 5.56×45mm NATO 5.8×42mm .30 Carbine 7.62×39mm 7.62×45mm 7.92×33mm Kurz
Premodern	10.4x38mmR 10.4×47mmR 11x42mmR Albini-Comblain 11×50mmR Comblain 11mm Beaumont 12.17×42mm RF 12x46mmR Musket Spain XPL .22 Winchester Centerfire .25-20 Winchester .32-20 Winchester .43 Spanish Carbine .45-60 Winchester .45-75 WCF .433 Egyptian .50-70 Government 14×33mmR Wänzl 15.24х40R Krnka
Commercial	Calhoon cartridges .20 VarTarg 5 mm/35 SMc .20 Tactical .204 Ruger 5.6×39mm .22-250 Remington .22 PPC .219 Zipper .224 Valkyrie .222 Remington .225 Winchester 6mm BR 6mm PPC 6 mm XC 6mm ARC 6.5mm Creedmoor 6mm AR 6×45mm .25-45 Sharps .250-3000 Savage 6.5×47mm Lapua .277 Wolverine 7mm BR Remington 7×33mm Sako 7.62×40mm Wilson Tactical .30 Remington AR .350 Legend .35 Remington .360 Buckhammer .401 Winchester Self-Loading
Prototype	.351 Winchester Self-Loading .345 Winchester Self-Loading 4.85×49mm 5.6x48mm Eiger 6×45mm SAW 6.45×48mm XPL Swiss 6.5×39mm 6.8mm Remington SPC .280 British 7.5×38mm 7.5×38mm 7.65×33mm 7.65×35mm 7.75×39mm GeCo 7.92×41mm 12.7×55mm STs-130