Check this out....
Step 1: Take your gun, buy a couple of different types of quality ammo (Berger 6.5 Creedmoor, FGMM, Hornady ELD-M)and shoot the piss out of it. It should tighten up after a few rounds.
Step 2: Keep shooting the piss out of it until accuracy starts to fall off.
Step 3: When...