This is driving me nuts, cases measure out same as new factory 223/5.56, only difference is COAL, but COAL is as specified by Speer and Hornady reloading books.
I've thoroughly cleaned the chamber and lugs, cleaned and oiled the BCG, it's a little better, but still won't close. The only thing I can see is the base is rough from the extractor.
As an added note I breoke the charging handle trying to remove a stuck loaded case.
Any ideas? Help!