yeah thats good info but id say in most cases youll never use that formula because like he said the angles you typically shoot are not very steep. if im shooting on an angle i think is significant enough to make an adjustment i just dial my turret to the line of sight distance and hold low on the area of acceptance that id like my bullet to strike within. or maybe give it a click or two less "UP" and hold low also depending on how dramatic the angle apears. then again i usually shoot at targets 18 inches wide and 30 inches tall with a little peice missing on each side of the head i mean... top square area.