I recently zero my rifles before going to a match. A lot of snow drifts. So I set the target in the low spot a 100 yards away. When I shot the match I shot high on all my dope. Could not figure this out. Got back to the house and looked at my target. It was placed at a 7 degree angle for my shooting bench. Shoot the gun at a level 100 yards and rezero the gun. How much do you think this would have an effect on a shot at 800 yards? Or do you think this would not have any affect on the bullets impact.