I've got a dillon F.C. die for my 9mm and a RCBS taper crimp die for my.45 I'don't see much difference, and I don't think there's a lot of difference between the three lee,rcbs,dillon,they all basically all do the same thing,the important thing here is that you are crimping in a different opreation, instead of trying to seat/crimp at the same time,by crimping seperatly you will eliminate most, if not all of your feeding problems, I do it with ALL of my handgun ammo now,