zaks got the right idea. where my arrow goes in is determined by where I want the arrow to exit. I want the arrow to pass through 2 lungs plus I want to cut something around the heart area. so my exit hole is by the far front leg. depending on the deers distance and my height in the tree and how the deer is angled to me at the time determines where my pin is aimed. so look at the pictures of deer atnatomy and figure out how to cut two lungs and heart and large arteries with one pass through the deer look at all angles and you will see where to aim.. you will also see that some angles are not possible..