Quote:
Originally Posted by Dean2
Use a level and Plumb Bob to put a perfectly level + on a wall ten feet or more away. Mount the gun on your shoulder using sticks, bipod or offhand depending how you shoot. Level the reticle to the shoulder mounted rifle. What is important is that the reticle is level and square vertically when you are shooting it. Being square while the gun is in a vice is actually irrelevant unless you are mounting a scope strictly for shooting from a bench mounted rest like BR competition. Getting it square in a vice may not make it square when you are shooting it because your body and shoulder are not perfectly vertical or horizontally true.
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I want the rifle vertical , when the reticle is vertical, then I can work at holding the rifle vertical. If the rifle is not vertical, you are introducing angular error at any distance except the distance the scope is zeroed at. If you use turrets, or a BDC reticle, with angular error present, the point of impact will be off at longer distances.