A friend of mine brought me his 30-06 that was not shooting well. He had gone after the scope screws but didn't check the bases. The screws were all loose and it had been hammering on the locating pins for some time. The front screw started it because it was too long. I fixed the pins, degreased the holes, cut the screws down, and used loctite. I torqued them down and remounted the scope. It should be good to go now.
Loctite and proper torque are important. A good surface finish is just as important.