Well i took me brand new Sportster out with a new BSA 3-12 Sweet 17. I set the AO for 50yrds and had at it. Good 1" groups considering no tinkering, new barrel, Remington ammo which i heard sportsters don't like. Went to 100yrds and AHH the image is blurry..messed with the focus on the eye bell, little bit better....oh AO is still at 50yrds :-D. so stupid me made me panic for nothing. Never got a 100yrd group really just kinda 1 shot adjust, 1more adjust, another adjust. im just messin right now.