Petzal's said a couple of times that it's not meant to mimic game results. Like it says, it's just a repeatable, standardized medium that will expose any weaknesses in bullet design, unlike gelatin that can be way too forgiving.
As to producing results that are remotely comparable to game animals... what animal? where's it hit? etc... We all know that the results, shot to shot, for identical bullets in similar animals, even with very similar placement can vary hugely. One Nosler ballistic tip hits a rib of a deer bang on and blows up and leaves no exit. The next one slips between two ribs and leaves a fist size exit hole out the far side. One TSX hits the shoulder and loses its petals and then the guy's #####ing about it pencilling through, the next TSX hits the shoulder a little different and expands perfectly.
Terminal ballistics, I figure, has too many variables and unknowns to ever get a test medium that's gonna really replicate what happens when a bullet hits the bone. I think Petzal's just going for something that lets him see different bullets side by side in similar conditions.
