The .17hmr is an awesome round. I have a savage mod 93R17that will put 5 rounds under a quarter at 100 yds. I myself would stick with the .17hmr for a rimfire gun for extreme accuracy and great killing power on varmints. I have heard guys taking coyotes up to 100 yds. Maybe a little light though. The .17hmr is here to stay IMO but I don't think the .17 mach 2 will. Sales on the mach 2 are slow but dealers sell the heck out of the .17hmr. I have an AccutriggerSavage 93R17BTVS on order and can't wait.Here it is.