I started shooting prairie dogs in 1949. Started looking for an ultimate varmint rifle some years ago. Sofar I have tryed out the 17 HM2, 17HMR, 17 Fireball, 17 Rem, 204 Ruger, 22 LR RF, 22 WMR RF, 22 Hornet, 221 Fireball, 222 Rem, 223 Rem, 22-250 Rem, 220 Swift,and 243 Win rifles. I wont to try out the 17 Hornet and the 5.7X28MM rifles. Back in the 50s when I only could afford a 270 Win I used it to shoot p dogs ,other unwonted critters, pronghorn ,mule deer, and elk. But now the 204 Ruger is hard one to over look for a handy varmint rifle.