what round is the us military changing to

Intermediate rifle cartridge

vi.8×43mm Remington SPC
half-dozen.8 SPC (left), five.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)
State diameter	0.270 in (half dozen.ix mm)[1]
Neck diameter	0.306 in (7.viii mm)
Shoulder bore	0.402 in (x.ii mm)
Base bore	0.422 in (ten.7 mm)[1]
Rim diameter	0.422 in (10.seven mm)
Rim thickness	0.049 in (ane.2 mm)
Example length	one.687 in (42.8 mm)[i]
Overall length	ii.260 in (57.4 mm)
Case chapters	34.viii–36.9 gr H2O (2.26–2.39 cm3)
Maximum pressure (C.I.P)	58,700 psi (405 MPa)
Maximum pressure (SAAMI)	55,000 psi (380 MPa)
Ballistic performance
Bullet mass/type Velocity Energy 7.45 g (115 gr) Full Metal Jacket 2,575 ft/s (785 g/s) i,694 ft⋅lbf (2,297 J) 7.78 g (120 gr) SST 2,460 ft/southward (750 m/due south) 1,612 ft⋅lbf (2,186 J) 7.1 g (110 gr) Sierra Pro Hunter 2,500 ft/s (760 m/southward) one,525 ft⋅lbf (2,068 J) 5.5 g (85 gr) Barnes TSX with "tactical" manufactory SSA load iii,070 ft/s (940 m/s) 1,780 ft⋅lbf (2,410 J)
Test barrel length: 410 millimetres (sixteen in) [2] [3] [4] Source(s): [v]

The 6.8mm Remington Special Purpose Cartridge (6.8 SPC, six.viii 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.Southward. Army Marksmanship Unit and United states Special Operations Command^[6] to possibly supplant the 5.56 NATO cartridge in Short Barreled Rifles (SBR) and Carbines. Based on the .30 Remington cartridge,^[7] it is midway between the v.56×45mm NATO and seven.62×51mm NATO in bore bore. It uses the same bore bullet (usually not the same weight) as the .270 Winchester hunting cartridge.

Development [edit]

The 6.8mm SPC cartridge was designed to address the deficiencies of the final ballistics of the 5.56×45mm NATO cartridge currently in service with the armed forces of all NATO-aligned countries.^[viii] The cartridge was the result of the Enhanced Rifle Cartridge Plan. The vi.8 SPC (six.8×43mm) was initially developed by Primary Sergeant Steve The netherlands and Chris Murray, a U.s. Ground forces Marksmanship Unit gunsmith,^[ix] to offer superior downrange lethality over the 5.56 NATO/.223 Remington in an M16-design service burglarize with minimal loss of magazine capacity and a negligible increase in recoil.^[ten]

The program started the pattern by using a .30 Remington case, which was modified in length to fit into magazines that would exist 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 diverse caliber bullets using a .30 Remington parent case, Holland and Murray determined that a half dozen.five mm caliber projectile had the best accurateness and penetration, with historical information going dorsum for decades of United states of america Army exterior and concluding ballistic testing, but a 7 mm projectile had the best terminal functioning. The combination of the cartridge case, pulverization load, and projectile hands outperformed the 7.62×39mm and 5.45×39mm Soviet cartridges, with the new cartridge's muzzle velocity proving to be nigh 61 g/south (200 ft/s) faster than the vii.62 x 39.^[12]

The six.8mm Remington SPC was designed to perform improve in brusque-barreled CQB rifles after diminished performance from the v.56 NATO when the M16A2 was changed from the rifle configuration to the current M4 carbine. The 6.eight SPC delivers 44% more than free energy than the five.56mm NATO (M4 configuration) at 100–300 metres (330–980 ft). The vi.8mm SPC is not the ballistic equal of the 7.62×51mm NATO cartridge, but information technology 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 vi.8 mm generates effectually 2,385 J (one,759 ft⋅lbf) of muzzle energy with a vii.5-gram (115 gr) bullet. In comparison, the 5.56×45mm circular (which the 6.eight is designed to supersede) generates around 1,796 J (one,325 ft⋅lbf) with a four.0 grand (62 gr) bullet, giving the half-dozen.eight mm a terminal ballistic reward over the 5.56 mm of 588 J (434 ft⋅lbf). 1 of the enigmatic features of this cartridge is its existence designed for a curt barrel carbine length rifle than the standard rifle length is (unremarkably 41 cm (16 in)). The round simply gains about 7.half-dozen–10.7 thousand/south (25–35 ft/s) for every 25 mm of barrel length by the standard 410-millimetre (sixteen in) barrel (all else being equal) up to butt's length around 560–610 mm (22–24 in) with no gain or loss in accurateness. Information technology likewise does well in rifles with less than 410 mm (16 in) barrels. In contempo developments (the flow 2008–2012) the performance of the vi.eight SPC has been increased by approximately 61 to 91 k/s (200 to 300 ft/south) past the work of ammunition manufacturer Silver State Armory LLC (SSA) and a few custom rifle builders using and designing the correct sleeping accommodation and barrel specifications. The 6.8mm Remington SPC cartridge weighs depending on the manufacturer and load between sixteen.viii and 17.6 grams (259 and 272 gr). As well, 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.eight Magpul P-mags and an overall cartridge length of 5.ix centimetres (2.32 in). The personal defense weapon (PDW) known equally the "Six8" is SPC II w i:250 millimetres (10 in) twist and is able to use all current 6.viii SPC factory ammunition.^[13]

Muzzle velocity from a 610-millimetre (24 in) barrel [edit]

7.1-gram (110 gr) Nosler Accubond	870 grand/s (two,840 ft/south) – Silverish Land Armory (SSA)
7.five-gram (115 gr) OTM	850 grand/southward (2,800 ft/southward) – Remington Premier Lucifer
5.5-gram (85 gr) Nosler E-Tip	940 m/due south (iii,100 ft/s) – SSA
5.8-gram (90 gr) Nosler BSB	910 grand/s (2,980 ft/due south) – SSA
7.1-gram (110 gr) Hornady BTHP TAP	820 one thousand/s (2,700 ft/s) – Hornady Police Enforcement "tactical" manufactory load
7.5-gram (115 gr) OTM (FMJ)	831 g/s (2,725 ft/south) – SSA
vii.5-gram (115 gr) Gunkhole tail hollow indicate (BTHP)	850 m/southward (two,800 ft/s)
7.five-gram (115 gr) Sierra Match King (SMK)	850 m/south (two,800 ft/s)
7.one-gram (110 gr) Hornady V-MAX	850 1000/s (2,800 ft/s)
7.1-gram (110 gr) SCHP	850 m/southward (two,800 ft/s) – SSA "combat" manufactory load
vii.1-gram (110 gr) BTHP OTM & Barnes TSX	840 m/due south (ii,750 ft/s) – Wilson "combat" manufactory load
five.5-gram (85 gr) Barnes TSX	970 m/due south (iii,180 ft/southward) – SSA "tactical" factory load
5.8-gram (90 gr) Speer Gilded Dot	930 m/s (3,050 ft/southward) – Federal(ATK) "tac/mil" load

^[14]

Cage velocity from a 510-millimetre (20 in) barrel [edit]

7.i-gram (110 gr) Nosler Accubond	850 one thousand/s (2,800 ft/s)- Silvery State Armory (SSA)
vii.v-gram (115 gr) OTM	820 m/due south (2,700 ft/south)- Remington Premier Match
vi.ii-gram (95 gr) Barnes TTSX	880 m/south (2,880 ft/s) – Doubletap
5.viii-gram (90 gr) Bonded Defense JSP	910 grand/s (2,980 ft/s) – Doubletap
6.5-gram (100 gr) Nosler Accubond	855 m/s (ii,805 ft/s) – Doubletap
7.1-gram (110 gr) Nosler Accubond	830 grand/due south (2,710 ft/s) – Doubletap
7.5-gram (115 gr) Full metal jacket boat tail	806 m/southward (2,645 ft/s) – Doubletap
5.8-gram (90 gr) Speer® TNT	910 one thousand/due south (2,980 ft/s)- SSA

Muzzle velocity from a 410-millimetre (16 in) barrel [edit]

seven.one-gram (110 gr) Nosler Accubond	820 m/s (2,700 ft/due south)- Argent Country Armory (SSA)
7.5-gram (115 gr) OTM	800 m/s (2,625 ft/due south)- Remington Premier Lucifer
5.5-gram (85 gr) Barnes TSX	920 grand/s (3,030 ft/south) – SSA
5.5-gram (85 gr) Nosler E-Tip	900 m/s (2,950 ft/southward) – SSA
5.eight-gram (90 gr) Nosler BSB	870 grand/s (ii,840 ft/s) – SSA
7.1-gram (110 gr) Hornady V-MAX	810 m/southward (2,650 ft/s)
seven.5-gram (115 gr) Sierra Match King (SMK)	810 m/s (ii,650 ft/south)
7.5-gram (115 gr) OTM (FMJ)	785 m/s (ii,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 Aureate Dot	880 g/s (2,900 ft/s)- Federal(ATK) "tac/mil" load
six.two-gram (95 gr) Barnes TTSX	790 g/s (2,600 ft/due south) – Wilson Combat factory load[15]
7.1-gram (110 gr) SCHP	810 m/south (2,650 ft/southward) – SSA "combat" factory load
7.i-gram (110 gr) Hornady BTHP TAP	780 k/southward (2,550 ft/due south) – Hornady Police force Enforcement "tactical" mill load[16]
7.1-gram (110 gr) BTHP OTM & Barnes TSX	790 one thousand/south (two,600 ft/south) – Wilson "gainsay" mill load[17]
9.1-gram (140 gr) Berger VLD	732 g/s (two,401 ft/due south) – SSA factory load. (Discontinued)

Comparing to other military calibers [edit]

Cartridge	Muzzle velocity	180 metres (200 yd) driblet	180 metres (200 yd) velocity	370 metres (400 yd) drop	370 metres (400 yd) velocity
v.56×45mm 3.6 g (55 gr) M193	937 m/s (3,073 ft/southward)	56 mm (two.2 in)	717 m/south (ii,353 ft/s)	710 mm (27.8 in)	531 one thousand/south (one,743 ft/s)
5.56×45mm 5.0 g (77 gr) OTM	817 thousand/s (2,679 ft/southward)	84 mm (iii.three in)	675 thousand/s (2,216 ft/due south)	830 mm (32.vii in)	550 m/s (ane,810 ft/southward)
half-dozen.viii×43mm SPC vii.v thou (115 gr) SMK	810 k/due south (2,650 ft/s)	89 mm (iii.v in)	653 m/s (2,143 ft/s)	900 mm (35.four in)	511 1000/due south (ane,677 ft/s)
6.8×43mm SPC 7.1 g (110 gr) 5-MAX	810 m/southward (2,650 ft/south)	84 mm (3.three in)	673 m/due south (2,208 ft/s)	790 mm (31.ane in)	552 g/s (i,811 ft/southward)
vii.62×39mm	700 thousand/s (2,300 ft/s)	84 mm (3.iii in)	545 m/s (1,787 ft/southward)	1,370 mm (53.eight in)	404 thousand/s (1,324 ft/s)
7.62×51mm 10.9 grand (168 gr) SMK	790 grand/s (2,600 ft/s)	86 mm (3.iv in)	681 m/south (two,235 ft/s)	820 mm (32.3 in)	576 k/due south (1,891 ft/southward)

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

ATK Gold Dot [edit]

When the LWRC Six8 was being developed, Alliant Techsystems was contracted to develop a new six.8×43 mm circular for the weapon. Dissimilar smaller commercial firms, ATK is a big ammunition supplier that delivers products for the U.S. Army, so it has large resource and manufacturing capabilities at its disposal. Commercial cartridges varied in instance capacity and thickness, but LWRC wanted a thick and durable case for military machine uses. A 90 gr (5.viii g) load was adult specifically for a loftier muzzle velocity and low felt recoil from the Six8'due south viii.5 in (220 mm) barrel. Constructive range is over 300 yd (274 grand) and the bullet still has enough energy to penetrate intermediate barriers. Three ninety gr loads were constructed for testing that included Gold Dot, Monolithic Hollow Point, and FMJ. The Gold Dot bullet was selected with a .035 in (0.89 mm) jacket and a bonded cadre. The propellant was designed for reduced muzzle flash stable performance at temperatures between -29.2 to 125.half dozen degrees F. Cage velocity averaged at a 200 ft/s (61 m/s) divergence at the required temperature extremes from the viii.5 in barrel. From a 24 in (610 mm) barrel, the round produced a grouping of one.56 in (40 mm) at 200 yd (183 m).^[19]

Butt length	Muzzle velocity	Muzzle energy
220 mm (viii.5 in)	750 m/s (2,450 ft/due south)	ane,626 J (i,199 ft⋅lb)
410 mm (16 in)	880 chiliad/s (2,900 ft/s)	2,280 J (one,680 ft⋅lb)
610 mm (24 in)	930 m/s (3,050 ft/s)	2,519 J (1,858 ft⋅lb)

Applications [edit]

Military and law enforcement adoption [edit]

Past late 2004 the 6.eight×43mm SPC was said to be performing well in the field against enemy combatants in special operations.^[eight] Nevertheless the cartridge was non used by conventional US military personnel. It was not adopted for widespread use due to resistance from officials.^[20] The half dozen.eight SPC was designed for better terminal effectiveness at the shorter ranges of urban combat experienced in Iraq. When fighting in Transitional islamic state of 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.^[21] In 2007, both the U.S. SOCOM and the U.S. Marine Corps decided non to field weapons chambered in half dozen.8 mm due to logistical and price bug.^[22]

While there are many rumors of evaluations of the cartridge past several major federal and local law enforcement agencies, the US Drug Enforcement Administration has allowed private agents to purchase the M6A2 D-DEA – which uses the half-dozen.8mm Remington SPC – as an authorized alternative to their duty weapon. In 2010 the Jordanian state-endemic arms manufacturer KADDB announced that they would be producing six.8 mm rifles and carbines for the Jordanian Army.^[23] There is besides 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.eight Pmags specifically for the LWRC Six8.

Current chamberings [edit]

There are several different chambers for the vi.8 SPC which yield different results. They are:

• Original Murray six.eight×43 ERC adult in 2002
• The Remington SAAMI submitted specifications. It was supposed to have a one.three mm (0.050 in) freebore, 45° cone angle, 7.1 mm (0.278 in) ⌀ freebore. The reamers and PTG prints had an 80° cervix to freebore cone angle, which was a result of a mistake in the reamer cartoon submitted, and was never corrected by the reamer maker or Remington during the procedure of tooling upward for the testing protocols that eventually drove the SAAMI submission.
• SPC II is the current standard chamber used by most barrel articles. It has been said to be very close to the original Enhanced Burglarize Cartridge Program chamber. Information technology has a 2.five mm (0.100 in) freebore, 45° cone bending, 7.1 mm (0.278 in) ⌀ freebore, and 7.84 mm (0.3085 in) neck.^{[ needs update ]}
• Murray DMR sleeping room, which was meant to address improved accuracy expectations for the ERC Special Purpose Burglarize Plan in SOCOM.
• 6.viii ARP created by AR Functioning. It has a two.four mm (0.095 in) freebore, 45° cone angle, and a 7.05 mm (0.2775 in) ⌀ freebore, and 7.84 to 7.85 mm (0.3085 to 0.309 in) neck.
• Noveske Mod i designed by Noveske Rifleworks. It has been said to have a 2.v mm (0.100 in) freebore.
• Bison Armory half dozen.eight Bison, introduced December 2017, which decreases the freebore of the six.viii SPC II chamber to1.8 mm (0.072 in).

Semiautomatic activity [edit]

The outset major manufacturer to offer a 6.8mm Remington SPC-chambered version of the AR-15 was Barrett Firearms Visitor, offering the Barrett M468 and subsequently the REC7. Past 2007, most major manufacturers of AR-15-type rifles for the noncombatant gun marketplace 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 half-dozen.8 mm for their Ruger SR-556 piston-driven AR-15 variant.^[24] The Stag Arms hunter and tactical models utilise the newer chamber (SPC II) and specified twist rates to arrange higher pressure level loadings, equally well as upper receivers in left-handed configurations. Rock River Artillery has an LAR-6.8 X Serial burglarize and uppers. Microtech Small Arms Research offers their version of the Steyr AUG in six.8. Robinson Armament Co. offers the XCR-L in 6.8, which tin can be hands converted between 6.8, v.56, and 7.62×39. Bushmaster delivered a vi.8 SPC II conversion kit to the marketplace as of Oct 2018. Ruger Firearms chambered their Mini-14 ranch rifle in this round for several years; notwithstanding, it has been discontinued.

See also [edit]

• .224 Valkyrie – 6.eight SPC derivative cartridge
• 6 mm caliber and 7 mm caliber — other cartridges of like size
• 6mm SAW — like cartridge developed to approximate both 7.62×51mm and 5.56×45mm cartridges
• .280 British — similar cartridge developed during the 1940s in the United kingdom
• .276 Pedersen — like cartridge developed in 1923 in the US
• .277 Wolverine — 6.8mm AR-15 wildcat based on 5.56×45mm instance
• List of AR platform cartridges
• List of individual weapons of the U.S. Armed forces
• vi.5×42mm, also known as 6.five MPC (Multi Purpose Cartridge), based on a necked up .223 Remington example.^[25]

Notes [edit]

1. ^ ^{a b c} "C.I.P. TDCC sheet six,viii Rem. SPC" (PDF). Archived (PDF) from the original on 2018-04-xviii. 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 :: Burglarize :: Choose past Caliber :: 6.8mm SPC :: half dozen.8mm SPC 120 GR SST®". Hornady.com. Archived from the original on 2011-09-29. Retrieved 2011-09-fifteen .
4. ^ "vi.eight 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 -". four April 2015.
6. ^ Non a individual endeavor or fully sanctioned regime projection
7. ^ "thirty Rem". Chuckhawks.com. Retrieved 2011-09-15 .
8. ^ ^{a b} John Freeway. "5.56-mm Cartridges". Globalsecurity.org. Retrieved 2011-09-15 .
9. ^ "Archived re-create". Archived from the original on 2015-05-04. Retrieved 2015-03-21 . {{cite web}}: CS1 maint: archived re-create every bit title (link)
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 six.8mm Remington SPC". Rifleshootermag.com. Archived from the original on 2010-11-24. Retrieved 2011-09-15 .
12. ^ "6.eight mm SPC Cartridge History & Development. Hornady's Ammunition. The Stag Carbine". Demigodllc.com. Retrieved 2011-09-fifteen .
13. ^ "Archived copy" (PDF). Archived from the original (PDF) on 2014-02-21. Retrieved 2014-02-10 . {{cite web}}: CS1 maint: archived copy as title (link)
14. ^ "DTIC.mil". Archived from the original on 2011-06-29. Retrieved 2011-09-xv .
15. ^ "6.eight SPC WC Ammo".
16. ^ "Archived copy". Archived from the original on 2012-04-23. Retrieved 2012-05-18 . {{cite web}}: CS1 maint: archived copy every bit title (link)
17. ^ "110 gr. Hornady BTHP, 2600 FPS - xvi" Barrel-Wilson Combat". Shopwilsoncombat.com. Retrieved 2011-09-15 .
18. ^ "6.8mm SPC article". Demigodllc.com. Retrieved 2011-09-15 .
19. ^ LWRCI UCIW SIX8 Review Archived 2014-04-29 at the Wayback Machine – Shotgunnews.com, 9 November 2012
20. ^ Another 7.62mm Bullet For M-16s – Strategypage.com, 8 January 2012
21. ^ The half dozen.v×40 Cartridge: Longer Reach for the M4 & M16 – SAdefensejournal.com, 26 March 2014
22. ^ Dan Lamothe. "Corps to pass on Army upgrades to M4". Regular army Times Publishing Company. Archived from the original on 2010-09-25. Retrieved 11 September 2010.
23. ^ "LWRC rifles to be license-produced in Jordan". Thefirearmblog.com. 2010-05-13. Retrieved 2011-09-fifteen .
24. ^ "Information on the 6.8 SPC Mini". Ruger-firearms.com. Retrieved 2011-09-15 .
25. ^ The six.5 MPC cartridge by SSK developed by J.D. Jones at SSK Industries | Commodity on DefenseReview.com

External links [edit]

• Definitive history of 6.8 SPC- The 6.eight SPC, Is it all that?
• 6.eight SPC FAQ
• Remington Armament Information Archived 2007-09-xxx 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

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Source: https://en.wikipedia.org/wiki/6.8mm_Remington_SPC

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