6 8 mm

6 8 Mm - The 6.8mm Remington Special Purpose (6.8 SPC, 6.8 SPC II or 6.8×43mm) cartridge is a Remington bottled intermediate rifle cartridge developed by Remington Arms for the United States Army and United States Special Forces marksmanship units in cooperation with members of the command . .

Probably to convert the 5.56 NATO cartridge to short barreled rifles (SBR) and carbines. Based on the .30 Remington cartridge,

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Its bore diameter is between NATO 5.56x45mm and NATO 7.62x51mm. It uses a bullet of the same diameter (usually not the same mass) as the .270 Winchester hunting cartridge.

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The 6.8mm SPC cartridge is designed to compensate for the terminal ballistic deficiencies of the 5.56x45mm NATO cartridge, which serves the armed forces of all NATO countries.

This cartridge was the result of Hensed's rifle cartridge program. The 6.8 SPC (6.8x43mm) was originally developed by Master Sergeants Steve Holland and Chris Murray, gunners in a US Army marksmanship unit.

Offering superior lethality with minimal loss of magazine capacity and a slight increase in recoil compared to the 5.56 NATO/.223 Remington in the M16 pattern service rifle.

The program began the design using a .30 Remington frame that had been modified in length to accommodate magazines loaded by the magazine wells of the M16 family of rifles and carbines used by the United States Armed Forces.

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In tests comparing different caliber bullets using Remington's 30.30 fragment case, Holland and Murray determined that the 6.5mm caliber projectile had the best accuracy and penetration, with decades of historical data from the US military following foreign ballistics testing and terminal, but the 7. mm projectile had excellent terminal performance. The combination of cartridge case, powder charge and projectile easily outperformed the Soviet 7.62x39mm and 5.45x39mm cartridges, with the new cartridge proving to be about 61 m/s (200 ft/s) faster than the 7.62x. 39.

The 6.8mm Remington SPC was designed to perform better in short-barreled CQB rifles after the underperformance of the 5.56 NATO where the M16A4 was converted from a rifle configuration to the Kurt M4 carbine. The 6.8 SPC delivers 44% more energy than the 5.56mm NATO (M4 configuration) at 100-300 meters (980-330 feet). The 6.8mm SPC is not the ballistic equivalent of the 7.62x51mm NATO cartridge, but it has less recoil, is said to be more controllable in rapid fire, and is lighter, allowing operators to carry more ammunition. Otherwise, it enables large caliber. The 6.8 mm round produces about 2,385 J (1,759 ft⋅lbf) of muzzle energy with a 7.5 g (115 g) bullet. In comparison, the 5.56×45mm round (designed to replace the 6.8) produces about 1,796 J (1,325 ft⋅lbf) with a 4.0 g (62 g) bullet, giving the 6.8 the ultimate ballistic advantage. 5.56 mm 588 J (434 ft⋅lbf). A distinctive feature of this cartridge is that it is designed for the short-barreled LGH rifle, as opposed to the standard LGH rifle (typically 41 cm (16 in)). Bullets with a standard 410 mm (16 in) barrel (all things equal) increase only 7.6–10.7 m/s (25–35 ft/s) per 25 mm of barrel length from the LG 560–610 barrel. mm (22 to 24 inches) without any gain or loss. It also works well in rifles with barrels shorter than 410 mm (16 in). In precision developments (2008–2012) the performance of the 6.8 SPC ranged from about 61 to 91 m/s (200 to 300 ft/s) by ammunition manufacturer Silver State Armory LLC (SSA) and increased a. Some custom rifle manufacturers use and design exact chamber and barrel specifications. The 6.8mm Remington SPC cartridge weighs between 16.8 and 17.6 grams (259 and 272 g), depending on the manufacturer and load. In addition, LWRC, Magpul and Alliant Tech Systems (ATK) introduced a new AR-15 chambered in 6.8 SPC chambered for Magpul's proprietary 6.8 P-mags and the 5.9 cm (2.32 in) L. Allows Jeth cartridge. A personal defense weapon (PDW) called the "Six8" SPC II with a 1:250 mm (10 in) twist and capable of using all factory 6.8 SPC ammunition.

Typical velocity data from carabiners with drop and velocity at 91 m (100 yd) zero at sea level.

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As of late 2004, the 6.8x43mm SPC is said to be performing well in special operations against AMI fighters in the field.

However, these cartridges were not used by conventional US military personnel. Due to the resistance of the authorities, it was not accepted for widespread use.

The 6.8 SPC is designed to improve the terminal's effectiveness in the short-range civilian combat experienced in Iraq. As the war in Afghanistan escalated, the gauges grew further apart, where the 6.8 SPC began to weaken. Experts suggested that the relatively short 6.8mm bullets would become ineffective at longer ranges.

In 2007, US SOCOM and the US Marine Corps decided not to field 6.8 mm chambered weapons due to logistical and cost issues.

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Although there have been many rumors of the cartridge being evaluated by several major federal and local law enforcement agencies, the US Drug Enforcement Administration has authorized individual forces to purchase the M6A2 D-DEA - which uses the 6.8mm Remington SPC - An authorized substitute as their duty. Weapons In 2010, Jordanian state arms manufacturer KADDB announced that it would produce 6.8mm rifles and carbines for the Jordanian military.

There is also a contract between LWRC, Magpul, Alliant Tech Systems and the Royal Saudi Guard for approximately 36,000 Six8 PDW and an unspecified amount of ATK/Federal XD68GD (90g "Gold Dot Training" ammo) exclusively for the Pmagpul 68. LWRC Six 8.

The first major manufacturer to offer a 6.8mm version of the Remington SPC AR-15 was Barrett Firearms Inc., which offered the Barrett M468 and later the REC7. As of 2007, the largest manufacturers of AR-15 rifles were offering rifles in this caliber for the civilian firearms market. Round-specific AR upper receiver assemblies are produced by several small companies, including Daniel Defuss. Ruger Firearms no longer manufactures the 6.8mm for its piston-type AR-15 Ruger SR-556.

Stag Arms Hunter and Tactical models use new chambers (SPC II) and defined twist rates to accommodate higher pressure loads as well as upper receivers in a left-handed configuration. Rock River Arms has the LAR-6.8 X Series rifle and stock. Microtech Small Arms Research offers their version of the Steyr AUG in 6.8. The Robinson Arms Company XCR-L is offered in 6.8, easily interchangeable between 6.8, 5.56 and 7.62×39. Bushmaster released the 6.8 SPC II conversion kit in October 2018. Ruger Firearms kept their Mini-14 farm rifle in this round for years. However, it has stopped.

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