The .22 Magnum cartridge performance is kind of disappointing when it’s used in a revolver. Its velocity really drops off what with the short barrel and cylinder gap, not a whole lot quicker than some .22 LR’s. A while back I got a couple of boxes of .22 WRF’s and tried them. Used in a revolver their velocity is almost as fast as the .22 WMR, they toss a 45 grain bullet for a little more pop on squirrels and rabbits, accuracy is better (in all of my guns) and cost is about the same or a little less than the .22 Mag. In my opinion, they are a better choice for the revolver. Some gun shops stock a few boxes and Cabela's catalogs them. CCI (definitely not my favorite ammunition manufacturer) is the only brand I could find, but I hear that Winchester is about due to run some more off. The .22 WRF might be a little hard to find, but worth the look if you shoot a .22 Mag revolver.