:mrgreen: :rolleyes: ;) Truth is where you find it.
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R5R and Versifier have the problem nailed for you.....its all in the crimping.
Just be aware that with a roll crimp (which is what I use) the case length is critical. Any variation in case length will cause more or less pressure during the crimping process. I would bet that your cases with the distortion were longer in length than those without the distortion. You might check your case lengths. You might also want to invest in a taper crimp die.