Well, Davidmil that's what they said. They buy dead livestock and practice with them in their back range, pigs was one mentioned, could be that livestock have a weaker skeletal system, don't know. As you said maybe test conditions (barrels and plywood) don't perfectly mimic hunting conditions. That should be expected in any lab re-creation.

Myself, seeing that I was already a NAP customer, I tend to believe someone when they're being genuinely helpful and have absolutely nothing to sell me. . .