IIRC some but not all .22 WMR will also shoot .22 LR??? I know my Ruger single six had two cylinders (.22 LR / .22 WMR). Will any repeating rifle fire both? I have never had a .22 WMR rifle to base any experience on. No, I don't work for Ruger, they just figured out how to do the .22 right.
Since the cases are different, I never seen one. Not saying there aren't any, just I've never heard of one. Some of the single barrel rifles may have different barrels for each, but not both in the same barrel.