The cartridges that my work for you are the 17 Fireball, 17 Remington, 204 Ruger, and 221 Fireball . Hornadys 17 Hornet cartridges rifles may be available next year. Over the years I have enjoyed tring out various cartridges and brands of rifles. My small game and varmints rifles that I have used are the 17 HM2 RF, 17 HMR RF, 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. Im not a 22 Hornet fan but like the 221 Fireball round . The 204 Ruger round is a good one to start with. Its flat shooting with little recoil with plenty of bullet energy beyond 300 yards for prairie dogs and bigger preditors within 300 yards.