Re: Test medium to simulate scapula
I'm not a Veterinarian nor am I an expert on terminal ballistics. However, I did grow up on a working ranch and I went to paramedic school a long time ago so I'll throw my BS opinion into this one...
For the most accurate testing media, your idea of getting some scapulas from a meat processing plant is probably on the right track. You will still have to pay for them because they sell everything...and I do mean everything...that comes off of or out of those cattle. They often have contracts to honor and don't want to "part out" stuff to off-the-street buyers. This will all depends on where you live and how big the processing operation is. You might also consider contacting some rendering plants or large animal Vets. Don't limit yourself to cattle either. Horse scapulas can be had as well. Be prepared to carve them out of rotting carcasses.
Scapulas and pelvises (pelvi?) will probably work fine for you although the pelvis of a cow is thicker than the scapula of an elk. Even so, you could saw the pelvis in half to get the best use of the wide parts. Elk hides are actually pretty tough as is the meat and gristle that lay beneath so that would have to be simulated as well. Depending on how expensive some uncured, raw, cow hides are, you could try some of those. If not, then some old rubber floormats from a '72 Ford LTD (or similar) might work too.
I'm thinking something like this:
From outer layer to inner layer....cow hide or rubber mat...a wet phone book at least 2" thick...cow scapula or pelvis. Use some wooden dowel rods and duct tape to keep it all in place?
Just a thought....