Originally Posted by Bottomsup
There is no such thing as level mounting. What are you going to go off of? The action rarely has the bases true or level IMO and the receiver is rarely square in the stock or square with the butt plate. This has always bugged the hell out of me but I had to live with it. One good friend who used to do pillar bedding and testing on some Shillen barrels told me that he mounts the bases then lays a level across them. When its level he sets the scope in the lower rings and looks for a vertical line like the corner of a building far away to line up the vertical cross hair with.
I would always line hone the rings after mounting to make sure they are true to each other. You dont want a one piece base to jump the action as this can cause a bind or pressure on the action and or base if the base to action fit isnt perfect. Same for honing rings is to make sure they are true after mounting so as to not to put a bind on the scope.
Most people way over tighten the bases and rings. This is the number one way scope tubes are marked by the rings.
I tighten to scope mount specs with a torque wrench. I then set a 4' level (leveled) 100 yards out and after leveling the base, I check off of the turrets versus the 4' level so I'm checking vertical versus horizontal. To date, no problems. From there, I set the eye relief to the "comfort zone".