PRS Talk Scope angle mounting rail

20 moa is most common, but I know a few guys that prefer 30. 40 moa seems to be where more skepticism appears, depending on available internal elevation in the optic, caliber, etc.. As I understand it 20 moa became the standard at a time when scopes had less available internal elevation. The center of a lens is its most pure optically, so if you are looking through the edge as mentioned in the post above, you may not be seeing the best possible image that optic has to offer.
 
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