I just got a Rock River Arms Entry Tactical .223 AR. I went out to shoot today and had some trouble getting the scope sighted in. It's a Vortex strike fire red dot scope. . I set it in from 30 yards and it was about an inch high (which I wanted), I moved back to 60 yards and it was shooting a FOOT high. So I adjusted it and it shot great. Then I walked back up to 30 yards and it shot 10 inches low. I really don't know what to do with it.