Originally Posted by Lycan
Maybe I'm missing something.....
I get a level for the rail and bag the gun in tight. I get a grid target and level it. Very few target stands are level nor are most benches.
I level the receiver and then make sure the retical is level with the target. Tighten it down and go.
You either assume the receiver is square or you don't. If you don't you need to resolve that before you address anything else.
I say this because many people are fine with moa groups on a skewed rail.....so it doesn't matter.........but if you want bugholes then you need to chase things in the right order.
I've never had the problem with the mount being off center, but I do always check that the vertical crosshair of the scope is aligned with the bore. It never hurts to double check. And I'm really anal about my scope alignment. I do the plumb level I described earlier to check elevation adjustments are truly vertical, not just on a grid target. Then I shoot the square (adjust elevation, windage set number of mils on grid target, ensure adjustments are exactly on specification. If not, programs such as Applied Ballistics or Shooter allow for scope error.)
You truly owe it to the prey, as well as your piece of mind, to ensure complete accuracy of your equipment. Now all you have to worry about it yourself.