ORIGINAL: muzzyman88
haha, atlas, maybe I mistook this part of your post
Many broadheads will pop through a shoulder blade........but to destroy a 4" solid round bone and keep pushing hard enough to get through the deer is an entirely different story.
I guess you did.
Circumference=Diameter * 3.14
Diameter=2 * Radius
4" round/3.14= 1.27 (A 4" round bone would have a 1.27" "thickness")
Hope this helps.