I always run/crimp my 9mm reloads (and other cartridges too) through a Lee Factory Crimp Die (FCD) that guarantees they meet specs for the dimensions of the brass. It may not make a difference, but it certainly doesn't hurt any and I have few if any problems.
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My avatars are the Bulgarian word for "Fire", as seen on my 1900, 1906 and 1908 Bulgarian Contract DWM Lugers.
Looking for a DWM Commercial side plate #95
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