Can someone tell me the distance used by the various gunmakers to determine a gun's POI? As an example, my gun has an adjustable rib that goes from 80/20 up to 110% high. Through a lot of shooting and adjusting it to suit, I currently have it set at 100% so I know it supposedly shoots a full pattern high...but at what distance? I am in process of setting up another gun and would like to speed up the process by eliminating all of the trial and error shooting I did before. I intend to pattern the #1 gun at 20yds and measure where the center of the pattern strikes the board, then match that with the new gun.