I just learned the hard way. If you are going to shoot this round, buy 454casull dies or even 45colt dies. One, you only need to resize the front of the case. Two, if you bought 460 dies, you can't crimp 45colts with RCBS, but if you buy 45colt dies, you can size, and crimp no problems all three 454cassul, 45colts and 460.