Richard I would check the scope rings and bases to make sure they are tight. i had one ring loosen up on a Ruger 416 Taylor and didn't figure it for several rounds. Next check the guard screws in the trigger group and floorplate. If there is a screw in the forarm (I don't recall as its been a long time since I owned a post 64 70) check that as well. to tight is as much a problem as to loose. My longest shot at a Whitetail was with a post 64 M70 in 243. 447 paces across a winter wheat field to a 130 class 9 point. he resides with honor on the wall next to the gun room entrance. Those guns will shoot. I have had a scope go bad once or twice as well.
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