I can sure see what the others are saying. The diagram on here def. shows no void area below the spine or above the chest. Maybe it depends on how the deer is standing, etc.. But I know I have hit a no-mans zone, lol. If it hasn't happened to you, well then that is a good thing, and I hope you dont get to see where it is, because it means a wounded deer. it happened when I was young, and I dont want it to happen again, thats for sure.

Bartz, a center chest hold in the middle of the chest cavity should be good (basically right behind the shoulder). This gives you a little leway, up, down, left or right. Personally, i dont have the fastest bow in the world, so I always aim for the heart area, expecting the deer to duck (jump the string). By aiming lower I still hit them in the lungs if they duck, and if they dont duck, then I hit the heart.