Re: How much parallax is acceptable?
Short answer is ZERO!
Most fixed objective scopes are set to have zero parallax at something like 150 yds.
However, with the Leuy VX-IIs that I've had parallax has not been a problem.
A workaround is to back off the scope enough so that you have a black ring, small or large, around the reticle center. This is not the best for hunting except for chucks and such and targets, but it helps w/the parallax problelm.