My friend and I are going to do some testing on 140gr extreme penetrator rounds in .357 mag and 10mm. We're looking at a case of printer paper, a 3/8 inch plate of 1018 steel, pine 2x4s, and some other undetermined materials as well. What are your predictions? Which round penetrates deeper through the paper? How many 2x4s does it take to stop each one? Does either of them get through the steel? What other materials would make an interesting test subject? The handguns are a 6" 686 and a 5.25 XDm. I'm undecided about chronoing the rounds, since I only have 20 of each.