Never tested them myself...

I not sure if anyone ever really has. I know that Dr. Ashby tested (not on deer though) some of them (mechanicals), but Ibelieve that his number one determinant of penetration is arrow and broadhead integrity (including components). I don't believe that any mechanical head past this. I believe his second is broadhead mechanical advantage which I don't believe mechanicals passed either. If you're interested on researching, I could show you where to look.