I guess I could have worded that a little better. When I am shooting at an archery target downhill, I will pick a tree next to the target and follow the verticle line above the target until it is eye level. I will shoot the target for that distance and not the line to the target. I do just the reverse for uphill shots. It usually puts me right on the spot. It is hard to think about it and talk about it when you are so used to just doing it!! I guess that it would be a little more difficult shooting at 300 yards with a rifle across open country, but the same laws would apply. This should be about as clear as mud by now with me trying to explain it.........