KansasPaul, if the Lee FC die is just what shot1 says it is, a taper crimp die, just adjust it like you would any other taper crimp die. You have to understand that alot of company's put a special name on their product, but it's no different than what other company's do. Lets call it new and improved,updated, blah,blah,blah, it's the same old thing in a new package or name. Adjust it properly, and it'll work just fine. Since your loading .45acp, my cast bullets are sized .452, and the loaded round is .473, or just a hair over, after crimping, thats at the neck, as it's fattens up some towards the base. gypsyman