For rabbits and squirells I like the Remington Yellow Jackets, they do the same damage as stingers for less $. I've sold guns that don't like the little bees. If you can find them, the CCI SGB (small game bullet) do one hell of a number on thicker skinned varmints. They make this lovely "thock" when the hit, kind of like flicking an empty milk carton.
