Tom2008

I just grabbed this from an article by Chuck Adams.

"The largest single problem tree-stand hunters grapple with is learning how to compensate for downward arrow flight. An arrow always hits higher than normal on downward shots because gravity has less effect on its trajectory. This means you must aim lower than normal for killing hits. Hitting much lower depends on several factors, including the speed of your arrow, the angle of your shot, and the distance to your target. As a general rule, you should aim for the horizontal distance to an animal. In other words, a deer standing ten yards from the base of your tree-stand tree requires a ten-yard shot - even if actual shooting range is 15 yards. Some bowhunters pace off level distances around a stand to predetermine shooting yardages from the base of their trees."