I like the way this guy thinks. And the creativity of attempting such a thing is not lost on me at all. Still, I can't help but think he would achieved much more in terms of ballistics by scaling back just a bit to something like a .50 caliber with the same pressure.
I suppose that wasn't the point, and the idea was to prove it was possible which was great and I enjoyed seeing it done. But the 20mm really seemed to bottom our very early even at close range. I hope he tries some lighter loads. That was really different to watch. :D Thanks for posting.