Im using a Lee neck collet for reloading my .308 Win. I have been reloading Federal cases (they were left overs I saved before getting my reloading equipment. The cases have beed shot 3 times now. About 1/2 of them aren't neck sizing correctly. They are really loose. I can easily place a bullet in them. need trimming yet. My load through them have bee 44gr Varget with a cci br2 primer and a SMK 175 gr. Any ideas on whats going on with them?