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I've reloaded my 9mm brass with no crimping, you might make sure that your round is requiring a crimp. If you are crimping the round you could be over pressurizing the brass. Or the chamber of your gun is greater in diameter so the resizing dye is making your brass to small when you re size it. Get with a gun smith to determine a dye that works for your reloading needs. As for a crimping I strongly believe you are doing something that can be Very DANGEROUS. Consult to your book some have * to designate that a crimp is used. Be very careful and hope I've helped you on the problem.
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