My advice is to shoot a 3 or 5 shot group without moving the scope. That way you can see what the actual group size is. When your adjusting the scope after every shot you never know how tight the group is. Recheck your bases and rings for tightness first. If the gun still want group, I would try a different brand of ammo. If still no luck after that I would mount a different scope and see what the groups are. I have had a one rifle that wouldnt group any better than 3 inches at a 100 yards, I tried everything including glass bedding it, no luck. That rifle is no longer with me now.