Ruger Single Six 22/WMR. With a trigger job, it's outstanding. The WMR cylinder puts it into another realm.
GeauxTide took the words right out from under my typing fingers. I love my 5.5" Single Six, whether shooting .22 LR or .22 WMR. As a bonus, I also have an identical 5.5" stainless Ruger .44/.44 magnum.