I knocked the ring out of the bottom of my fcd over 5000 rounds ago. My plated and coated bullet accuracy went up without affecting reliability. It's a modified taper die that won't collapse the case. The case length variance of mixed brass makes it better than an older style taper crimp die. Just my experience. Best wishes. Btw I knocked the bottom ring out of my 9,40, and 45acp. I have extra fcd for bulge busting.
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