it really depends. hard to say without actually being in the situation. on a calm deer, almost without exception (20 yds and in)aim for the heart. this way, even if the deer does jump the string, I have a very good chance at centerpunching the lungs. case in point-hunting last year pre rut. passed a nice eight, then had a doe going bonkers around my stand for an hour. just would NOT calm down. squirrely wind had her spooked. finally, she follows two yearlings in to about 15yds on an oak flat that I am sitting. I know she is spooky even though she does not appear it. I put my 20 yd pin all but underneather her and let it fly. I hit her 6" above where I was aiming, perfect double lung shot. It is something that you just have to experiment with. if you have the luxury of putting a stand up say in your back yard, take the time to shoot from it and experiment at different ranges. I did this yesterday and am happy to say I am right on. I use to shoot from my parents rooftops as well. 30 yds looks alot further than it really is. hope this helps.