To be fair, RJM, I've noticed the same thing with a LEE Factory Crimp Die. I use one for my .22 Hornet, but absolutely nothing else. They can really bugger up some .45 ACP, and .40 S&W/10mm. It didn't take me 10000 rounds to figure it out, though, and I quickly lost interest in them after a short trial. IIRC, I walked out back and threw them as far as I could.
I am beginning to wonder about this Lee FCD with 180 XTP's in the 10mm. There is no doubt that when I run a loaded cartridge into the thing, it passes thru a section that is smaller diameter than the loaded cartridge before it hits the crimp collar. I feel that I am getting more consistency with factory loaded sig 180 FMJ loads than my hand loads with the xtp and 13.7 grains of AA #9 using the FCD.
