RE: 17m2 or hmr
I currently have a CZ-452 American in the .17HMR caliber. Yes it's pretty accurate, but at longer ranges, the wind plays havoc with that little .17 grain bullet!! If I had to do it all over again, I'd go witha T/C .22 semi-auto. At ranges up to 50 yards away, it will place the bullets into one ragged hole. My cousin bought one the same time I got my .17HMR, and I'm constantly amazed at the groups that gun shoots!!
For a dedicated Squirrel/rabbit gun, it can't be beat!! Besides the shells cost much less as well.