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I've been down this road. You should size the brass fired in the M1-A with a small base die, it's diameter just above the web may be your hang up. I just went through several hundred LC LR brass that I had to back up and resize with a small base die to get them to work.

55 vmax 25.0 benchmark cci br4 LC brass full prep(neck turned, flass hole deburred, etc.) makes 3100 fps from Rockriver EOP 18" bull 1/8 twist holds .3 moa out to 300 yards/turns pdogs insideout