Good Thread, I'm particularly interested in your theory that Rabbits die quicker than birds. I have in the past cleanly (Head/Heart) shot quite a few Pigeons at around 25-30m that seemed to flap for quite a while, though obviously dead. My thoughts are that with the .22 pellet passing through thin bone at a relatively high velocity the internal trauma is 'minimised', However with rabbits the pellet is striking a comparitively thicker bone structure and taking more of the bone mass through the brain, causing far greater trauma and an instant death.
My logic here is that if you shoot at a ba