First off, it isnt a hunt. It is killing livestock. Something that runs towards you at the sight of you, expecting food, isnt something that one can "hunt". Like someone else mentioned, why not try it on your dog that is going to be euthanized.[:'(]
I know bows and sharp BHs are lethal and all, but not as much as a bullet between the eyes. Why make the cow suffer more than it needs to, just because you want to test your equipment?

I understand how shooting through thick hide would be interesting to test a bow on, but try it on a dead cow dude, and dont call it hunting. I have enough confidence in my bow that I dont need to shoot betsy and see how far the arrow penetrates.
All that said, it has been mighty tempting in the past when the herd wanders by the stand ruining an afternoonhunt.[:@]