I'm rather new to reloading and I'm having problems with my 300 weatherby brass denting when I'm resizing. I've made certain there's no lube on the neck/shoulder areas, but they are still denting just below the shoulder. What am I doing wrong? Out of about 25 rounds 13 came out dented. If it helps any I'm using a single stage Lee press and new Redding dies. Any help would be greatly appreciated.