Once you shoot 17HMR, you won't be happy shooting 22LR! The 17HMR is far more accurate and suitable for longer distances. Either CCI or Hornady Vmax 17HMR ammo works well. CCI makes Hornady's ammo if you didn't know. They both shoot the same in my experience. There is no comparison between shooting 17HMR and 22LR. LAXammo is a good place to buy 17HMR online.