What load are you shooting and hot high is the temperature there? Best bet is to have your smith polish it out, however depending on the time frame, etc, I'd try backing off a grain or two and seeing what happens.
Your dies aren't the issue if it closes fine after loading, it's just after the round is fired correct? The brass may be grabbing the rings, again lightening the load may answer all your questions and pointing you in the direction of polishing the chamber.
