I have used various subsonic .22 loads for the same purpose, and the ones I like the best are the new Remington CeeBee long rifle HP's. (not the subsonic HP's mentioned previously) I normally don't care for Remington ammunition, but this stuff is super quiet, and is accurate and deadly. It is limited to about 50 yds though. The truncated cone HP expand well on ground squirrels and kills way better than the solid point subsonics.
