Any center fire from .17 caliber up to .25 caliber willdo a good job.

I have a few favorites depending on wheather and hunting situations.
Calm days no windshots out to 250 yards .17 hornet.22 hornet or .17 rem and over 250 yards.17 rem,.204 ruger, .223 or .22-250
Days with a lightbreeze.204 ruger, .223, .22-250or .243