Elmer ditched the .45 because they weren't strong enough for what he wanted to accomplish.
The material I use is Sim-Test and it stops a 230gr Federal HST from a .45ACP in 4". It stopped a 225gr .338 in 11". It's tougher stuff than ballistic gel.
Why ballistic testing media? Because it'll actually stop a bullet, where they usually exit on critters. It's VASTLY more consistent to compare loads to each other than shooting critters and it's more consistent from test to test than wet newsprint. If you think you can do better, you're more than welcome to try.
