Just picked up a 1903a3 in great shape. Took it home, doesn't close on a go gauge. It would close if you force it, it is very close (resistance is met about half way turning the bolt handle). Chambering a round (hxp, ppu, and federal hunting rounds) you feel slight resistance closing the bolt. As soon as the locking lugs engage it is tight (finger pressure will close it, some rounds close easily, others are very tight) but will close on a live round. I've cleaned the hell out of the chamber. My question is, should I buy a finish reamer to pick up a few thousands of headspace or just shoot a few hundred rounds to loosen the thing up? Tight headspace shouldnt make this thing into a grenade right?