I'd be tempted to try some lube on the lug faces first and see if that helps. If it does, and you've got alot of rounds down range without lubing the lugs periodically, look at them under a magnifier to see if they're galled. If so, the mating surfaces of the action may also be, and we're kinda back to getting the action re-cut if it's bad. If not, just take some 1200 grit compound and apply to the lug faces, chamber a fired case, and do a few lift/close cycles of the bolt.
You might also look at taking some 1200 grit valve lapping compund and working over the sear cocking cut in the bolt shroud, there's alot of drag there. It's the first thing I do to my rifles.