Make sure you are not jamming the mouth up into the die. Back off a quarter tern and measure again. I also deburr and polish the collet fingers so it doesn't mark cases. The fingers fit together better after this. I also polish down some of the machining ribs or marks then some auto re assembly moly lube sparingly applied and the entire operation is much smoother. First time I tried one in 375 I was waiting for that partial "toggle over" feel and blew the cap right off my brand new die and jammed the case. Boy was I disappointed. Threw the die to the back of the bench and left it there for a couple of years. Will send back to Lee and I bet they send me a new one maybe with a PS " your an idiot" but probably not.

I really like them now I am over the dumbazz curve.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli