This is what I do, but I don't consider myself an "expert".
I use the "Rifle Bar Level" (4" or 6") from http://www.deadeye2.com/
. Place it on an action such that it will tell you when the action is level and affix with included stout rubber band. Hang a quality plumb bob with brightly colored line appropriate for the job at a distance that you can see it well enough to do the job--it'll have to be inside to keep wind from affecting. Let it hang for a long time undisturbed. Using the rifle barrel level, level the action in your rifle cradle and then lock it in place when it's level. Make sure the scope crosshairs are on the plumb bob line leaving the scope fairly snug in the rings. Adjust the vertical portion of the crosshair to parallel the plumb bob line.
Sound easy? I takes me about awhile to get it just right making sure everything is lined up. But I know that the action in level and I know that the scope is about as close as humanly possibly to level as I can get it. There's probably a better way.
Some folks really like the Segway Reticle Leveler. Sinclair International and many other places have it. Probably simplest thing to do out there. It just seems to easy to me--I need an hour of frustration to feel that the job is done right, you know? [img]/ubbthreads/images/graemlins/wink.gif[/img]
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