@WapitiBob hit it but generally people would be better off if they focused on getting their hardware properly degreased, torqued, loctited with decent rings that are aligned with each other than all the silly leveling gizmos. Having a scope with a scope level mounted true to the reticle that the shooter uses when shooting makes a difference. If a shooter isn’t going to use a level on the scope when shooting, doing anything more than eyeballing it as plumb with bore while mounting is a waste of time.
Some other recent threads about leveling scopes that touch on it:
I just got my new nx8 2.5-20 scope in. I installed it on the rifle and to me it looks canted. I am using an unknown munitions bubble level on the rail, while it was level I leveled the reticle to a “plumb bob” string. Theoretically this should be perfectly level but when I level the bubble it...
www.hunttalk.com
No doubt the topic of scope leveling has come up many times, often including mention of the gadgets that are available to make it easier. But IMHO, the greater challenge is finding the best way and tool to level the action when mounting a new optic. After all, if the action isn't level, what...
www.hunttalk.com