bad_aim_billy, a .177 in a pellet gun is suffice to kill a squirrel (provided you have the right fps for the range). If you are worried about the recoil of a .22 LR then the .177 pellet gun will be your best bet.
How do ya score a squirrel's rack?
John 828, I love that CZ .22.
There is actually a "Squirrel Roundup"
In Northern California.
Read about it here.