Reloading 45 ACP using Lee dies. Lee TL452230-2R slug. I set up the bullet seater die for 1.250 OAL and they varied slightly to 1.249-1.250. Using the same die set I wanted to put a slight crimp on them in the last step so that the mouth was .470 but the round changed OAL at the crimp step to 1.234 to 1.241 I don' have a taper crimp die so I was just trying to get a crimp using the roll crimper.
The seater stem was backed almost all the way out so that wasn't the cause of the OAL shrinkage.
All ideas would be appreciated. Joe