The .22 WMR has the advantage, if no other, of being slightly larger than .22 L.R. cartridges (Duh!) which is a big help when your hands are cold.
The .22 WMR revolver also took the .22 WRF cartridges, which were flat point lead bullets at slightly lower velocities. This made a good combination for gray squirrels in tall timber. The .22 WRF didn't destroy meat, gave about the same performance as high velocity .22 L.R.
Loaded with .22 WMR hollow points, the magnum works good on small game and varmints.