Mark,

Couple of quick things to check...make sure all the screws are tightened on the scope base and rings (scopes can creep and make life miserable). Check to see if there is sufficient clearance between the front of the scope bell and the rifle barrel...there should be at the minimum the thickness of a dollar bill. Is the gun stock wood or synthetic? If it’s wood you could be having some contact between the barrel and the stock (could happen with the synthetic stock but I really wouldn't think so) and might need to be sanded down some and maybe freefloated and glass bedded. Just a couple of things to get you started…