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9mm crimp question


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I noticed that some headstamp brass do not even require crimp die to pass case & chamber gauge.

I made sure my seating die (RCBS) is turned way up so it does not even touch the brass, so definitely no crimping on the seating station.

My expander die is the Mr. Bullet Feeder one, and the bell is pretty obvious.

Supposedly these particular headstamp brass walls are really thin, FC for example, but when I put the flared brass (after dumping out the powder) it would fail case & chamber gauge. My question is, how could the seating process (without any crimping) remove the flare?

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