they effectively increased the amount of hydraulic pressure inside the hollow cavity that is needed facilitates proper expansion, thereby enhancing penetration.Well that was a surprising video. That bullet was hacked and jagged. What really surprised me was how far that home made hollow point made it. I was betting on it stopping in the second, maybe the third, but no where near touching the back of the fourth jug. And then with the second shot, I figured it would have gone all the way through. Cool test though.