17 HMR launches polymer-tipped 15.5 to 20 grain bullets at roughly 2,375 to 2,550 fps — dramatically flatter than any 22 rimfire. That speed makes it the rimfire of choice for prairie dogs, ground squirrels, and small predators out to 150+ yards, with explosive terminal effect on varmints. Match it to a quality rimfire scope and stretch what a rimfire can do.