To me accuracy is the most important element of .22 hunting ammo, and target ammunition is where I start. An older Paco Accurizer http://pacotools.com/tool_discriptions turns the round nose ammo to flat pointed versions for squirrels, the couple woodchucks I've shot were young and I left the high speed LR rounds with their noses round for better likelihood of penetrating sufficiently. I've wound up with higher velocity rounds for squirrels simply because they shot the best in the two rifles I use; one's a HP I use as-is and the RN version gets the RNFP treatment. Have not left any squirrels stuck in a tree and hope it never happens.