For each scoped gun I have, I've put the gun in a soft jaw vise, point it towards a known perfectly vertical line (eg. door frame,) and set a small "torpedo" level on a level part on the gun (usually on top of the rear iron sight.) When the gun is perfectly level, I rotate the scope in the rings so that the vertical cross hair is aligned with the known vertical reference, and then tighten the scope ring screws evenly, 1/4 turn at a time. Done, with no fuss...
Finding a level part on the gun can be the hardest part of using these levels, I have experienced that the inside rail and top edge of the reciever sometimes dont provide a level surface for the "level level level"... This I noticed on the weekend with a Model 70.
Adjusting the scope to the lowest setting, stepping back behind the butt and running an imaginary line up the center of the butt plate through the recticle of the scope has always been "close enuf" for me. Some people dont shoulder the gun straight either.
The LEVEL LEVEL LEVEL is an inexpensive tool that is generally worth it though.

For each scoped gun I have, I've put the gun in a soft jaw vise, point it towards a known perfectly vertical line (eg. door frame,) and set a small "torpedo" level on a level part on the gun (usually on top of the rear iron sight.) When the gun is perfectly level, I rotate the scope in the rings so that the vertical cross hair is aligned with the known vertical reference, and then tighten the scope ring screws evenly, 1/4 turn at a time. Done, with no fuss...



























