i got my own range at home out to 300 yards but its in the bush so there is no wind to worry about. im out at my buddies farm this weekend and first time shooting out to 600 yards from a hill across a open field using my .223 with 55gr federal v shok ammo. im getting on a 15x15" peice of paper. but im hitting 8 inches low and 10 inches right from my point of aim. on my scope 1/8" clicks at 100 yards. so at 600 yards im 120 clicks up. but im still 8" low, how do i fine tune to get up more. like how much is one click gonna move it at that distance?