As of now it'll withstand pinging from a .45 Acp. Just beef up your safety protocols to be safe. We don't want a 400 lb man to hack into it with a 9mm.
It appears to combine the hydro-static shock of a rifle and the surgery of a broad head. I would not want to miss the vitals and hit a deer in the guts with this, what mess that would make. In my county we are forced to use shotties for deer season. I'm gonna get some of these before Albany finds out about them and comes up with some fool reason to ban them.