I haven't read all of the posts. Like ingwe said, many times squirrels jump after being hit. I like the fact that he reports a shoulder shot would limit/prevent that. I know one time, I had a squirrel standing straight up, like a prairie dog, and I shot him square on the chest. He jumped straight up/down, three times, before dropping. It was...interesting, but as ingwe said, it probably scared off the rest. I have yet to shoot on with my 17 Mach 2