I'm new to reloading and I have a problem. When I resize the case, some of the shoulder gets dented. This is happening with both 22-250 and .300 win mag. I have taken apart both dies and cleaned them although I didn't see anything wrong with them and I still have the problem. Re seting does not help. This does not happen on every shell but does 50% of the time. I can get one perfect and then 2 dented and then back to perfect. Anybody know what I'm doing wrong?