Neither angular measurement is "wrong". Neither measurement is "right". Both will allow shooters to make precision shots and adjustment on targets to ranges further than people can accurately shoot to due to skill level and/or accuracy potential of their firearm/ammunition. MILS is the better platform for people engaging multiple targets at various distances from the same position in my experience. Not that it can't be done with MOA but for speed and ease of mental simplicity, MILS is where it is at for me and my mind when speed is a factor.
Jay
Jay
