Originally posted by pavan: A compound friend of mine years back tried to figure out the same thing with very light and short carbon arrows. He practiced at his long shots until he had some confidence, then bought a chrono from a friend. He backed off the measured distance of his bottom pin and shot to see how much speed the the arrow still had in it so he could decipher how much energy it had. He found that he had enough energy to totally destroy his chronograph with just one shot. He did have the right idea, how much speed did the arrow retain on long shots. I think the answer is about as far as a hunting arrow will fly is enough for deer.