From what I understand ,no you cant because some scopes allow for more vertical adjustment in one direction and it may not be good for the scopes springs to be maxed out. you're sure to get it exactly right without possibly stretching your springs by putting it flat against a mirror and you'll see 2 sets of cross hairs. The shadowy one is the reflection and if its high right your poi is high right relative to OC. Adjust the turrents as you're looking through to easily achieve OC. What I do then is bend my barrel to match poi to poa. I've not found anything that makes me wrry about bending barrels,just the opposite. heres a target pistol.
does this idea of optically centering scopes and using adjustable mounts to zero the reticle really only apply to air gunners or do shooters of regular firearms also do this?