interesting expansion. As for penetration, with that very light load VS a say, hunting charge, that might make all the difference. Also you'd wonder what happens when you push that bullet real hard for accuracy and distance. But a most interesting test there. I can picture a use for that out of say my Knight LK-II which is my short range Tree rifle. I normally shoot 80 grains of T-7 2f out of it. That might be a good deer stopper there. I will have to look that bullet up.