Thats a good one Andy. I dont think a rib slows down much. I punctured right thru the center of a rib on both sides with a cut on contact head. It also tore my fletchings off which would slow the arrow down some as well but I still got a complete pass thru and the arrow traveled another 12 yards before going into the dirt. I was shooting from the ground on that deer.

Now the leg bone, I can see that stopping an arrow very fast.