This video from Classic Firearms, featuring instructor Ky, provides a comprehensive, apples-to-apples comparison of how different .300 Blackout barrel lengths affect bullet velocity. The test utilizes multiple barrel lengths from 5.5 inches to 16 inches, alongside various supersonic and subsonic ammunition types, all measured with a Garmin chronograph. The analysis highlights the significant impact of barrel length on FPS and offers insights into optimal configurations for different shooting applications.
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