The nice thing about high magnification is that you can see your heartbeat and shoot between the beats.
Mirage etc is another issue.
Old AR Sporter with the Colt scope, 3x, would group at 1.5" or less prone at 100yds.
I have a 2.5x28mm Leupold that is also used on our ARs and the 458 No.1H.
pic circa 1980.