I discovered the problems that parallax can have on shot placement. My first question is parallax error repeatable? I have a Nikon Monarch 3x15 30mm tube with parallax adjustment. I am told that parallax is set at the factory at max magnification. Mine came pre set to 100yds and I was happy with that. First time shooting with it I set magnification to 6x and zeroed. On a recent hunt I cranked up to 15x to help count points. Shot low, missed a nice buck. Is it predictable? Can I determine at the range how much the shot changes over the range of power settings and bank on those POI changes every time? Will parallax error always cause a "low" POI or could it be all over the place. Or should I just invest in a First Focal Plane scope.