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Old July 5, 2020, 08:14 AM   #26
603Country
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Like I mentioned earlier, my use of the Lee FCD was on cast bullets, which you may not be shooting. I’ll run each cast bullet reload through the FCD, but can feel that nothing is being done to most of them. Just a few. The FCD is worth having, even if it doesn’t get much work.
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Old July 5, 2020, 07:23 PM   #27
markr6754
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Quote:
Originally Posted by Aguila Blanca View Post
But they aren't the same ... or, if they are, they shouldn't be.

Per SAAMI, .380 ACP should have a case OD of .3730 at the mouth, and .3731 at .04" back from the mouth. 9mm should have an OD of .3800 at the mouth and .3811 at .04 back from the mouth. That difference of .007 could mean the difference between chambering properly, or not chambering properly.
Pretty clear that you’re confusing the finished measurements of the round with the tools needed to achieve that result.

A taper crimp die set up for a 9mm will not even touch the mouth of a 380 ACP.

Conversely, a taper crimp die set up for a .380ACP will severely over crimp the 9mm round. It’s a tapered crimp die. Thus, so long as the round can enter into the die, the amount of crimp desired is totally under your control.

See attached screenshot of Hornady dies for .380ACP and 9mm.
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