Take a good look at your cases after they have been sized in this die. Do they have a "burnished" look to them? That is a satiny look, rather than a nice, shiny, very smooth surface where the die has swaged them back to dimension. If the burnished look is apparent, the die is damaged, and will continue to give you problems. Just package it up with a short note and ship it back to RCBS. They will send you a brand new die without any squawks at all. Regards, Eagleye.