I was thinking of the .17, a friend of mine has that gun and it's very accurate. I hunt out in "Amish Country" more or less. It's a nice family of Amish famers who love when I'm up there to deal with the ground hogs. The shots really do range though from 10 yards all the way to 150. Rarely do I take the long shots because it tends to be windy up on the hills.
As far as the response to fisherman66, the rifle will be for groundhog only, ammo is not that big of a deal; so long as I'm not spending $20 for a box of ammo.
If I were looking at a .17, any suggestions?