I wonder what your “go to test medium” is?
Other than having dead bears handy.
I have tested numerous caliber on bears, both alive and dead, and have a good idea of how deep different calibers and bullets penetrate.
So using plastic bags to hold them I simply used a stack of 1” dry magazine, followed by 4” of damp magazine, another 1” dry, then another 4” wet until I had a couple feet available.
It may or may not have been exact but it was amazingly close to what I got in a real bear
Then I could honestly compare my 30 Tokarev, 9mm , 357 and 44 loads
