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The military designation for this round is 6.8 common cartridge. [5] The XM1186 is the general-purpose 6.8 mm round, with other versions including reduced range rounds so weapons chambered in 6.8 mm can fire on existing ranges designed for the 5.56 mm, marking rounds for force-on-force shooting, and blank and tracer rounds. [26]
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.
Cartridge, caliber 7.62mm, NATO, ball, special, M118LR: 175-grain (11.3 g) 7.62×51mm NATO match-grade round specifically designed for long-range sniping. It uses a 175-grain (11.3 g) Sierra Match King hollow point boat-tail bullet with a ballistic coefficient (G7 BC) of 0.243. [94] Produced at Lake City Army Ammunition Plant.
A popular 7 mm hunting caliber bullet is actually .283 in diameter (7.2 mm), but wildcat cartridges using this caliber bullet in a 5.56 x 45 case have so far not been successful. There is an existing and well-developed use of hunting-rifle bullets in the .277 caliber (6.8 mm), introduced by Winchester as the 270 in 1925.
The 6.5 Grendel bullets have a true diameter of 6.71mm / 0.264" and the 6.5 Grendel case can be formed from abundant 7.62x39 cases with a neck re-sizing die, and fire-forming a slight change to the shoulder, if the case is made from brass. Many of the popular 7.62x39 cases are made from steel, which will not work for reforming the shoulder.
The 7.62 mm designation refers to the internal diameter of the barrel at the lands (the raised helical ridges in rifled gun barrels). The actual bullet caliber is often 7.82 mm (0.308 in), although Soviet weapons commonly use a 7.91 mm (0.311 in) bullet, as do older British (.303 British) and Japanese (7.7×58mm Arisaka) cartridges.
The 7.62×39mm (aka 7.62 Soviet, formerly .30 Russian Short) [5] round is a rimless bottlenecked intermediate cartridge of Soviet origin. The cartridge is widely used due to the global proliferation of the AK-47 rifle and related Kalashnikov rifles, the SKS semi automatic rifle, as well as the RPD and RPK light machine guns.
The below table gives a list of firearms that can fire the 7.62×51mm NATO cartridge. This ammunition was developed following World War II as part of the NATO small arms standardization, it is made to replicate the ballistics of a pre-WWII full power rifle cartridge in a more compact package.