OK from what I see with my 22LR match rifles setting the AO at 150 yards would mean about 1/2" at 25 yards. Still well withing the kill zone. Unless at extreme long range I still don't see how an AO will help with a deer rifle at normal ranges IE up to 100 yards. My largest scope is a 3X9, set at 3 unless I go to the corn fields. Then I have plently of time to adjust. Still most shots are within 100 yards and to me no need for AO.