well I clean the screw holes, degrease the action, rough it up a bit, clean again, add bedding compound to the base, let it setup, then attach the rings, center the reticle, cradle it in the rings and snug. I then set the rifle in front of a plumb line, and sight on the edge of the line and turn the scope till its as plumb as I can get it by eye. Then I turn the up adjustment stop to stop as I watch the reticle in relation to the line, if it wonders any back or forth on the line I loosen the screws, turn the scope a bit, turn it just a td and do it again, when it no longer waivers I tighten the ring screws, recenter the the reticle, turn it up the height of my scope above center of bore, if using a 20 MOA base, I turn it down 20 MOA, then pull the bolt and boresight, I mostly am on paper at 300 yards.
RR