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    subsonic 223 rem

    Actual data I just got back from the range and I thought I'd share my experience with subsonic 223. I loaded HP38 in Winchester cases with CCI primers and Winchester 55gr projectiles. I chrono'd them at about 15 feet. Rifle was an AR-15 with a 16" barrel 1/9 twist. HP38 4.0 grains, four...
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