.17 Mach II is what I'm using now. Shot one on Sunday @ 7 yds horizontal distance, about 50' vertical. Entered between the front legs, out the top of the shoulders. No bloodshot meat, no reminants of the bullet in the meat. Outside of the shoulderblades was fine, just a 50 cent piece exit wound.
I'd hate to see what a .17 HMR would do.
I too have used a lot of different things to take squirrels, but I think I'll be sticking with the .17 Mach II for a while.
