What I do to get mine vertical is put the gun in the soft jaws of the vice and use a spirit level on the top of the bases (or across any flat horizontal surface on the rifle itself) then make sure it is secured in the vice. Once this is done check that the rifle is still level.
(across the rifle, as forward back along the rifle wont matter while doing this, it will be presumed that the scope rings will end up being parralell to the bore)
The while the scope is slightly loose in the rings, use the spirit level to check the turret on top is also level. (as long as it is flat across the top which most are.). Tighten and check level again. Tightening the screws on one side can "pull" the scope over so this last check is definitely warranted.
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