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The 6.8 mm 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, United States Special Operations Command to possibly replace the 5.56 NATO cartridge in a Short Barreled Rifle(SBR)/Carbine.
Based upon the .30 Remington cartridge, it is midway between the 5.56×45mm NATO and 7.62×39mm in bore diameter. It uses the same diameter bullet (usually not the same weight) as the .270 Winchester hunting cartridge.

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