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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 below table gives a list of firearms that can fire the 7.62×39mm cartridge, first developed and used by the Soviet Union in the late 1940s. [1] The cartridge is widely used due to the worldwide proliferation of Russian SKS and AK-47 pattern rifles, as well as RPD and RPK light machine guns.
The carbine weighs in at 3.6 kg (7.9 lbs) without accessories [5] and 4.5 kg (9.92 lbs.) with accessories (like a loaded magazine and sling). [6] A Short-Barreled Rifle (SBR) version with a 13-inch barrel is also rumored to be in the works. It comes with polymer 30-round AK-style magazines manufactured by US-Palm. [7]
The 7.62×39mm (also called 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-pattern rifles, the SKS semi-automatic rifle, and the RPD/RPK light machine guns.
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 Heckler & Koch HK417 is a battle rifle designed and manufactured by Heckler & Koch. [1]Being the larger caliber version of the Heckler & Koch HK416, and chambered for the 7.62×51mm NATO rifle cartridge, it is intended for use where the penetrative power, stopping power, and range of the 5.56×45mm NATO HK416 would otherwise be insufficient.
Service rifle cartridge cases: (left to right) 7.62×54mmR, 7.62×51mm NATO, 7.62×39mm, 5.56×45mm NATO, 5.45×39mm The development of the cartridge that eventually became the .223 Remington (from which 5.56mm NATO would eventually be developed) would be intrinsically linked to the development of a new lightweight combat rifle.
The GP (General Purpose) WASR-10 is a 7.62×39mm caliber semi-automatic rifle that has been offered since the end of the Federal assault weapons ban. Factory-original rifles only support single-stack, low-capacity magazines (10-rounds). After import, Century Arms offered WASR rifles modified to accept double-stack, standard-capacity magazines.