I always check the loading block for even powder levels in each case before seating bullets so I really doubt it was a no powder situation and even more so because of 4 in the same lot. I also do use a very heavy roll crimp on these loads and have been known to crush a case or two trying to crimp too much. I'm gonna pull all my loaded rounds and step it up a bit to maybe 4.8 or 5 gr just to be safe, but I think I'm leaning towards a bad batch of primers.
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