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8 March 2020, 13:08 #6
I really appreciate that you've shared your experience here so we can all learn from it. I never form my own brass but that's largely because I really don't like the idea of having brass that doesn't match its headstamp. For 300 BLK brass my preferred approach is to shoot factory ammo and save the brass. The S&B loaded ammo can be a pretty good value compared to buying just brass.
For the rounds you already have loaded, should you inspect each round with a case gauge? That should pick up any bulging issues, I would think. I never do that with loaded ammo but in this case it seems like it would tell you if you have any more rounds out of spec.
Also, I wonder if running the formed brass through a Lee Collet neck sizer as one last step would help. If the neck is too thick, I suspect the brass would mushroom and be ruined in the collett die.