Re: RCBS .380ACP Bullet Seating/Taper Crimp Die
Ideally a crimp is done seperately, I have had similar luck trying to crimp and seat at the same time. One thing you may be experiencing, which is normal, you are measuring OAL to the tip of your bullet, where in the manufacturing process of the bullets there are variances, this maybe why your OAL has a bit of difference.
I would first back off the case expandsion a tad, then back the seating die out to eliminate the crimp, then run the seating plug down to proper seating depth. In other words set up as if you are seating without a crimp. After you're done seating the bullets take the seating plug out of the die and run it down to a proper crimp and follow through with the crimping process. I would recommend purchasing a lee factory crimp die, what you are experiencing is common, hence the reason crimp dies were born.
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Last edited by 312shooter; 02-06-2012 at 10:03 AM..