I like to play with small cal. varmint rifles. I`ve never owned a .17 Mach IV, but do have a .17 Rem., a .17-223 and a .17 AH. I also have a .204 and 6 different rounds in .22 cal. I can also tell you the advantages of each and show you on paper to prove it. In fact I have to show you on paper because in the field there is little difference in the performance of any of them on game up to and including groundhogs. My little .17 AH, using 10.4 gn`s. of powder shoots flat to abt. 290 yrds. with a 19 gn. bullet. The .17 Rem. and the .17-223 are so close they are abt. identical, but the new .17 Fireball would be abt. 1/2 between them and my .17 AH.
The real reason they bring out these new round is not to fill a nitch that has never been filled befor, it is TO SELL GUNS! You see there are guys like me that just have to try every new factory round, and when they don`t bring them out fast enough we build Wildcats.