Just to add to Al's post, seldom do a set of mounts actually fit the receiver 100%. A set of Kokopelli bars will show you at a glance how far the rings are out of alignment. Finding where, the fit between the mount and receiver, the rings, etc is the fun part.
In that picture you can see a shim under the front of the mount. After the action was straightened, the ring deburred and the screws were just snugged (not tightened or torqued) the bars indicated the front was low. BTW, don't think for a moment you can't flex a one piece mount with those little 6-48 screws! After bedding the mount to the receiver I also bed the rings. For that I use one of a series of tubes I ground from.995" to 1.005" in .001" increments that is .002"-.003" under the tube diameter. Lapping is fine, but it also makes the ID of the rings larger...you may lose some clamping force on the tube. When the scope is set in the rings, the top halves installed and the screw lightly tightened you can't move the scope by hand. If any adjustments are required, the top needs to be loosened, the scope lifted free of the bedding and everything re-tightened. I also use a bore sighter during the initial setup to help make sure if the barrel is pointed north and the scope isn't pointed east! Its just a rough "guessestimate" that two agree to some extent.
The final results, the mount(s) fit the receiver perfectly, the scope is held securely and unstressed , but most importantly, nothing moves. BTW, I do not use Loctite on the screws and to date have never antythng come loose.
Right, wrong, agree , disagree or indifferent, for the last 20 or so years its how I do them.
Bill
