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Originally Posted by oldbear1950
I have both 45 acp and 9 mm factory crimp dies
and 45 acp and 9mm/38super/38auto taper crimp dies.
All are factory new and never used.
I have been told I needed the taper crimp dies for the 45 acp/9mm/38super/38auto.
So which dies do I need ?
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What make/brand of dies?
The only company I know of that sells something called a "factory crimp" die is Lee. But their die sets that include a factory crimp die are 4 die sets, not 3 die sets. So I have no idea what you have.
As a rule, semi-auto cartridges are taper crimped, and revolver rounds are roll crimped (meaning the mouth of the case is rolled/bent inwards so the sharp edge can grab onto the bullet).
With a 3 die set, the crimping operation is combined with the seating operation. This makes die adjustment critical, because you want the bullet to be fully seated by the time the crimp is applied. The purpose of a separate, fourth die for crimping is to split those two operations, so the third die only needs to seat the bullets to the correct depth, and the fourth die takes care of crimping.