So many years ago I made two hickory broad heads just for the fun of it, hafted them on a cane shaft with goose fletch. I used to target shoot them into a cardboard box stuffed with towels. Never had a clue how powerful these guys are until I missed the target at Patrick's place. I hit the wooden fence and jammed the arrow half way into the fence. By comparison, I did the same thing with a steel broad head and got the same penetration.
After digging the arrow out the fence I expected the hickory broadhead to be destroyed. Nope, a little sanding and reshaping the slightly flattened tip and it was good to go again. Hopefully Patrick or Josh will be along to post pics. Rhe bow was only a 37# bow at 26" either so tjere is lots of potential in wooden heads. It also was not heat hardened.