Approach the problem analytically, and accost the usual suspects.
1. Is Scope known and reliable? Parallax free at 100 yds?
2. Make sure rings and bases are tight, but not binding.
3. Check crown with 10x and Q-tip for burrs.
4. Pull bolt and check rear lug surface to make sure you have engagement on both lugs.
5. Stand rifle vertically on the butt. Loosen both screws, and allow recoil lug to engage bedding block. Tighten front screw firmly, but not to full spec. Grasp barrel and stock lightly at the forend near the stud with one hand and tighten rear screw firmly. If you felt barrel movement, you have a bedding issue. If not, tighten both screws to full spec. Make sure front screw is not too long and contacting the bolt.
6. Check to see of barrel is free floated.
7. Drop the trap door on the BDL floorplate and see if mag box moves freely. If not, you may have a bedding issue. Disassemble, remove mag box, and reassemble as described in #5.
8. While floor plate is dropped, cycle bolt to make sure it is not binding. If bolt will not drop freely rearward when rifle is vertical (Barrel pointing to ceiling) you have stress on the action.
9. Check head space and free bore.
10. Shoot and report back.
