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sig mcx rattler

  1. I

    5.5" BBL 5.56 Quickload Help, Please

    Can some kind soul with Quickload, please, calculate some approximate chamber pressure for some potential Trail Boss loads to shoot out of 5.56 5.5" SIG MCX Rattler? Bullets: Speer 1029 Varmint .224 50gr JSP & Speer 1023 Varmint .224 45gr JSP Loads for each bullet: 4,5,6 & 7gr of Trail Boss...
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