RE: slick trick vs. after shock.
 

http://www.corbins.com/sim-test.htm

This might help you.

RE: slick trick vs. after shock.
 

I've looked at that stuff before for testing out different bullets but it would cost over $200 to get enough to work with.

It's nice stuff though, especially since it doesn't have to be refrigerated and can be reused.

RE: slick trick vs. after shock.
 

I have read in some ballistics tests, I believe by the FBI, that pvc pipe was used to simulate bone because it had similar properties. Just FYI.