What you need are media of different (relevant) consistency. Expansion tests are fun, but how do we mimic the difference between hitting a deer square in the shoulder, versus a pass through behind the shoulder? Hide, shoulder muscle, scapula bone and ribs, all twice over in and out, plus the bulky front lungs in the middle, is a totally different proposition to hide and ribs only, plus thinner less bulky rear lungs. And then you’ve got all the permutations of angle to think of!
Not sure it’s worth spending any money on really.