I am looking for a new rifle to use for shooting ground squirrels. In the past I have mostly used a Ruger 10/22 and have also shot friends Rugers and Savages in 17HMR and one 17HM2. I am considering either a 17HMR or a new 22LR. Which would have better results on ground squirrels, I will only be using the the rifle on ground squirrels nothing else. Does the the increased ballistics of the 17HMR justify the extra cost of ammo over the 22? I appreciate the comments. Thanks.