I personally have run into this problem more than once, every time it was with an rcbs die. My first one was a .223 bolt action I took that die to a machine shop and has .020 removed from the die. I thought it was an extremely tight chamber, works perfectly now. The next one was a .30-06, same problem with that one. Bolt lacked a little bit of closing once again had .020 removed worked fine spoke with rcbs after this they informed me it must be an isolated problem, you know me being the only one with such a problem. I must not have learned my lesson so I got a set of .308 dies guess what same old problem once again so I returned those to midwayusa and ordered a set of Dillon .308 worked great straight out of the box. the last time was just a few months ago with a set of .270 dies that I took to a buddys work and put in a lay and removed .020 . I will not be buying anymore rcbs dies everything else rcbs seems to be fine just some quality control with the dies. a friend of mine that lives out of state has had this same problem on multiple times as well. hope this helps you and also hope rcbs gets its act together and once again produces the dies I know they can, because they have in the past.