Did you check the action? I have read that sometime's the action get's soft under the rear tang from cleaning solvent getting on it. I always bed the action in either glass or better, I think, liquid steel. If that rear tang bed surface get's soft you can pull it down tight and actually get a small bit of bind in the receiver. You might try tighting the front screw down and just getting the rear screw snug and see how it shoot's. If that help's tape around the barrel at the fore end tip, put bedding compound under the rear tang and tighten down the front screw. Tape at the front of the barrel channel is to keep the barrel from pulling down and taking pressure off the rear tang.will say i floated the barrel recently plus just got new scope.