Английская Википедия:6.8mm Remington SPC

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Шаблон:Short description Шаблон:Infobox firearm cartridge

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[1] to possibly replace the 5.56 NATO cartridge in short barreled rifles (SBR) and carbines. Based on the .30 Remington cartridge,[2] 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 6.8mm SPC 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.[3] 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,[4] 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.[5]

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.[6]

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 Шаблон:Convert faster than the 7.62 x 39.[7]

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 Шаблон:Convert. 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 Шаблон:Convert of muzzle energy with a Шаблон:Convert bullet. In comparison, the 5.56×45mm round (which the 6.8 is designed to replace) generates around Шаблон:Convert with a Шаблон:Convert bullet, giving the 6.8 mm a terminal ballistic advantage over the 5.56 mm of Шаблон:Convert. 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 Шаблон:Convert). The round only gains about Шаблон:Convert for every 25 mm of barrel length past the standard Шаблон:Convert barrel (all else being equal) up to barrel's length around Шаблон:Convert with no gain or loss in accuracy. It also does well in rifles with less than Шаблон:Convert barrels. In recent developments (the period 2008–2012) the performance of the 6.8 SPC has been increased by approximately Шаблон:Convert 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 Шаблон:Convert. 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 Шаблон:Convert. The personal defense weapon (PDW) known as the "Six8" is SPC II w 1:Шаблон:Convert twist and is able to use all current 6.8 SPC factory ammunition.[8]

Muzzle velocity from a Шаблон:Convert barrel

Шаблон:Convert Nosler Accubond Шаблон:Convert – Silver State Armory (SSA)
Шаблон:Convert OTM Шаблон:Convert – Remington Premier Match
Шаблон:Convert Nosler E-Tip Шаблон:Convert – SSA
Шаблон:Convert Nosler BSB Шаблон:Convert – SSA
Шаблон:Convert Hornady BTHP TAP Шаблон:Convert – Hornady Law Enforcement "tactical" factory load
Шаблон:Convert OTM (FMJ) Шаблон:Convert – SSA
Шаблон:Convert Boat tail hollow point (BTHP) Шаблон:Convert
Шаблон:Convert Sierra Match King (SMK) Шаблон:Convert
Шаблон:Convert Hornady V-MAX Шаблон:Convert
Шаблон:Convert SCHP Шаблон:Convert – SSA "combat" factory load
Шаблон:Convert BTHP OTM & Barnes TSX Шаблон:Convert – Wilson "combat" factory load
Шаблон:Convert Barnes TSX Шаблон:Convert – SSA "tactical" factory load
Шаблон:Convert Speer Gold Dot Шаблон:Convert – Federal(ATK) "tac/mil" load

[9]

Muzzle velocity from a Шаблон:Convert barrel

Шаблон:Convert Nosler Accubond Шаблон:Convert- Silver State Armory (SSA)
Шаблон:Convert OTM Шаблон:Convert- Remington Premier Match
Шаблон:Convert Barnes TTSX Шаблон:Convert – Doubletap
Шаблон:Convert Bonded Defense JSP Шаблон:Convert – Doubletap
Шаблон:Convert Nosler Accubond Шаблон:Convert – Doubletap
Шаблон:Convert Nosler Accubond Шаблон:Convert – Doubletap
Шаблон:Convert Full metal jacket boat tail Шаблон:Convert – Doubletap
Шаблон:Convert Speer® TNT Шаблон:Convert- SSA

Muzzle velocity from a Шаблон:Convert barrel

Шаблон:Convert Nosler Accubond Шаблон:Convert- Silver State Armory (SSA)
Шаблон:Convert OTM Шаблон:Convert- Remington Premier Match
Шаблон:Convert Barnes TSX Шаблон:Convert – SSA
Шаблон:Convert Nosler E-Tip Шаблон:Convert – SSA
Шаблон:Convert Nosler BSB Шаблон:Convert – SSA
Шаблон:Convert Hornady V-MAX Шаблон:Convert
Шаблон:Convert Sierra Match King (SMK) Шаблон:Convert
Шаблон:Convert OTM (FMJ) Шаблон:Convert – SSA
Шаблон:Convert Barnes TSX Шаблон:Convert – SSA "tactical" factory load
Шаблон:Convert Speer Gold Dot Шаблон:Convert- Federal(ATK) "tac/mil" load
Шаблон:Convert Barnes TTSX Шаблон:Convert – Wilson Combat factory load[10]
Шаблон:Convert SCHP Шаблон:Convert – SSA "combat" factory load
Шаблон:Convert Hornady BTHP TAP Шаблон:Convert – Hornady Law Enforcement "tactical" factory load[11]
Шаблон:Convert BTHP OTM & Barnes TSX Шаблон:Convert – Wilson "combat" factory load[12]
Шаблон:Convert Berger VLD Шаблон:Convert – SSA factory load. (Discontinued)

Comparison to other military calibers

Cartridge Muzzle velocity Шаблон:Convert drop Шаблон:Convert velocity Шаблон:Convert drop Шаблон:Convert velocity
5.56×45mm Шаблон:Convert M193 Шаблон:Convert Шаблон:Convert Шаблон:Convert Шаблон:Convert Шаблон:Convert
5.56×45mm Шаблон:Convert OTM Шаблон:Convert Шаблон:Convert Шаблон:Convert Шаблон:Convert Шаблон:Convert
6.8×43mm SPC Шаблон:Convert SMK Шаблон:Convert Шаблон:Convert Шаблон:Convert Шаблон:Convert Шаблон:Convert
6.8×43mm SPC Шаблон:Convert V-MAX Шаблон:Convert Шаблон:Convert Шаблон:Convert Шаблон:Convert Шаблон:Convert
7.62×39mm Шаблон:Convert Шаблон:Convert Шаблон:Convert Шаблон:Convert Шаблон:Convert
7.62×51mm Шаблон:Convert SMK Шаблон:Convert Шаблон:Convert Шаблон:Convert Шаблон:Convert Шаблон:Convert

Typical trajectory information from carbines with drop and velocity calculated at sea level with a Шаблон:Convert zero.[13]

Applications

Military and law enforcement adoption

By late 2004 the 6.8×43mm SPC was said Шаблон: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.[14] 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.[15] 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.[16]

In April 2022, after enduring over 100 technical tests and firing more than 1.5 million rounds, the Army awarded a contract to Sig Sauer to produce the Next Generation Squad Weapon — or NGSW — XM7 Rifle, XM250 Automatic Rifle and a 6.8mm family of ammunition to replace the M4A1 Carbine, M249 Squad Automatic Weapon and 5.56mm family of ammunition within the close combat force.[17]

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.[18] 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.[19] 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.

See also

Notes

Шаблон:Reflist

External links

Шаблон:30Remington

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  1. ↑ Not a private endeavor or fully sanctioned government project
  2. ↑ Шаблон:Cite web
  3. ↑ Шаблон:Cite web
  4. ↑ Шаблон:Cite web
  5. ↑ Шаблон:Cite web
  6. ↑ Шаблон:Cite web
  7. ↑ Шаблон:Cite web
  8. ↑ Шаблон:Cite web
  9. ↑ Шаблон:Cite web
  10. ↑ Шаблон:Cite web
  11. ↑ Шаблон:Cite web
  12. ↑ Шаблон:Cite web
  13. ↑ Шаблон:Cite web
  14. ↑ Another 7.62mm Bullet For M-16s – Strategypage.com, 8 January 2012
  15. ↑ The 6.5×40 Cartridge: Longer Reach for the M4 & M16 – SAdefensejournal.com, 26 March 2014
  16. ↑ Шаблон:Cite web
  17. ↑ Шаблон:Cite web
  18. ↑ Шаблон:Cite web
  19. ↑ Шаблон:Cite web
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