This is a Forster FLS Die. It's 308 cases when running through the die they 4 or 5 cases have came out with a ring close to the base of the case? Anyone know what could be causing this? The dies haven't seen used in a couple years. The dies were bought new and hardly used. Should I take it apart and try cleaning it out real good? Thanks! Tried to post photo but it says file is too big. There's no groove can't feel it with fingernail.
