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  1. Ballistics - Internal and External
    I was reading my Lyman 50th edition today looking for guidance on loading .223 Remington with the military SS109 62 grain bullets, WW748 powder, and AR primers like Federal Premium AR Match. So Lyman says they tested with both a Universal Receiver, 24", 1 in 12 twist, & a Colt AR15 w/20" barrel...