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  1. S

    300 Blackout load not rechambering

    My bolt will go back far enough to eject spent brass but won't load new round too. I am using a DPMS upper with a Colt AR lower. Do I need to try a different powder or go up a few tenths over max?
  2. S

    300 Blackout load not rechambering

    I started loading a Hornady 208 grain a-max with 4227. Got all the way up to the max load, from the IMR load data on web, which was 10.3 grains. Could not get rounds to rechamber. Has anyone had this problem before?
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