I know all chambers are different but you may want to check the base to ogive length of all your rounds because I just measured some loaded basically identical to yours, just a different case make and powder charge, but in a saami 7mm rm chamber, I'm using the same comperator you are and I get 2.754" base to ogive and that's a .010" jam in the rifle I speak of. If yours is similar that's like a .065" jam, good reason it wouldn't want to close. Also bergers can vary in ogive length quite a bit from lot to lot, buy 500 at a time. My total oal is 3.412" btw. Only other 2 possibilities are case stretch or case head expansion on the verge of seperation, mic the belt, if its larger than .535" toss the cases or your about to have a really bad problem.