Winchester 17 Win Super Mag - Tiny bullets going really, really, really fast. Fun to shoot!
I loved my .17HMR hated to trade it, but it was for the better it got me a kick ass Burris scope. And it went to a friend of mine so I know it's in good hands. I wish this caliber was avaliable in semi-auto. But I prefer bolt action Savage Arms.
.... fast (for a rimfire)
Pricey but good~ www.volquartsen.com