how many of you with pa on your scopes really use it. im getting to understand it better. basically you want to adjust for the distance you are shooting to elimate the parralex and get your cross hairs to appear "fixed" instead of the illusion of movement...something like that. ive read a lot about the fact that the actual distance points on most scopes are not even correct. they suggest you re-mark every 50 yards by checking it yourself. ive got a burris sig. select with pa that ive yet to mount. guess i need to play with it a bit. how many guys with high power scopes dont use them and feel they dont need to?