"I've never seen a sub sonic round that can match they're effectiveness on small game. They have 40-50% more energy at 100 than remington subsonics. I hit a coon with one at about 25 yrds square in the chest head on and it did a back flip and roles 10' to a stop. Never seen a .22 LR do that before. Needless to say, I was sold."
Sorry, but it's physically impossible for any .22 rimfire to do this. Maybe a muscle reaction to being shot.