What's "over crimped?" I've reloaded a few hundred LC 52 through 55s and had not a single problem, until the cases grew long enough to pinch in the bore just ahead of the chamber.
Was using lead bullets and a bit too much crimp. Trimmed 'em and never had a problem again.
If you mean that the primer pockets are crimped, that's a simple one-time operation to take it out.
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