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We wanted to test three threaded-muzzle bolt actions in a reference chambering well known to hunters and shooters, the 308 Winchester, along with a less-common bolt-action choice, the 300 AAC Blackout, which is more often chambered in AR-15 uppers because it has the same overall length, base diameter, and rim diameter as the 5.56 NATO round, so it will feed from an unmodified magwell in an AR-15 lower. The 300 Blackout can be loaded with lighter bullets, where it compares favorably to the 7.6239mm Soviet round, or loaded with heavier bullets that travel below subsonic speeds for suppressor use. At sea level, the speed of sound is roughly 1125 fps, with the "roughly" changing based on air temperature and other conditions.

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