Conclusion
The muzzle flash and report of the .22 WMR cartridge fired in a three inch revolver barrel is similar to a centerfire revolver cartridge, but its recoil is much lighter. An adversary under fire from a .22 Magnum will not be thinking, "puny .22 rimfire." You can debate the effectiveness of the .22 Magnum as a defensive cartridge, but in our experience shooters familiar with the terminal performance of the .22 WMR rate the 40 grain JHP loads just below the .32 Magnums and .38 caliber revolver cartridges and ahead of the .25s and standard .32s. It is a wicked little cartridge.