RE: downhill shooting
As most 3Ders know, it is the horizontal distance as stated above. If a pole goes straight up from the deer...your shot would be the distance from you to the pole straight out from you. If the pole is straight out from you at 20 yards, you would shoot your 20 yard pin. The deer could be 30 or 40 yards from you as you look at him (depending how steep the hill), but the shot is only 20 yards as that is the distance gravity is affecting the arrow.