I have to confess (if you read my previous post) I believe I was fortunate once when I shot a 1500 pound bull bison with a 125 grain Magnus Stinger broadside at 35 yards and watch the arrow pass completely through and kept flying across the prairie never to be seen again. After examination, the arrow passed neatly between the ribs on both sides. That bull made three 360* rotations, ran about 25 yards and collapsed. But on the other hand I can remember hitting a whitetail's rib so squarely it sounded like a 22 LR going off.