Quote:
Not stupid at all. I think, but you need to measure, that you will find sized 9mm cases will be 0.005” undersized before expanding.
Expanders, can be cut 0.001-0.003” with sand paper and something to rotate it.
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I must be fundamentally misunderstanding what the OP has written. I read he used a case mouth expander--which I take to mean flaring the mouth just enough to get the bullet seating going.
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