Bernie at Old West Bullet Moulds makes the slickest crimp die for the heeled bullets by modifying a Lee F.C die for, I believe, a .35 Remington. The one he sent me comes with an adjustable length shell holder and works great when you get the shell holder length set for the case length. I am still waiting for R&D to send me the conversion cylinder so I just loaded a couple of dummy rounds to see how the crimp die worked-and it worked perfectly. I'm getting anxious to see how the '51 conversion will shoot.
Lone Oak