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8.6 Blackout, also sometimes referred to as the 8.6 BLK or the 8.6 Creedmoor, is a centerfire rifle cartridge developed by the weapons manufacturer Q. It utilizes a shortened casing from the 6.5mm Creedmoor necked up to an 8.6mm (0.338 in) projectile and designed for use in bolt action rifles or as a caliber conversion for AR10 and AR308 rifles. 8.6 Blackout barrels use a 1:3 or 1:4 twist rate and bullet weights between 160 - 225 grain for supersonic, and 285 - 350 grain for subsonic.

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