When I first sighted in the scope, I thought I had made a HUGE mistake. First shot at 100yds was off target. Shots at 50yds were still off target. Tears were forming by this time. To make a long story short, the turrents were turned a full rotation off. It took me about 20 rounds to figure this out. When set correctly, shots were only an inch high. I was able to test this scope on my AR-10 today and was very impressed. Had a slight wind from my 4:00. Only making elevation adjustments for the required distance resulted in bullets impacting a little high and slightly left. Shooting 3-5 rounds at 100, 200, 300, 400, and 600 yards gave me a 9" overall group. I'm very pleased and looking forward to seeing what happens at 700 and 800 yards.