BWalker-
I do appreciate your input. But you weren't there and didn't closely examine the wound channel -- nor did you extract the bullet. (And I've tested quite a few of these, both on game and in test medium.)
You are correct in the statement that many bullets do indeed tumble near the end of their journey, and I've examined plenty of wound channels which indicated as much. But that is simply not the case here.
These perform quite differently than typical Barnes bullets. I suggest you get a couple boxes and try them yourself.
