I've been shooting them in my Woodsman, and i really like them. I'm going to buy up a few more boxes to have around for a low noise, short range small game dispatcher.
They appear to be the Yellow Jacket bullet, with some cuts in it to make it expand at the lower velocity of this round. As a game killer, i find the Viper/Yellow jacket bullet an EXCELLENT design and this is just more of the same.
DM