Over at americanrifleman.org, Richard Mann tested .22 Magnum cartridges for personal self-defense. He concludes “I still believe any gun is better than no gun. I also believe there are a lot of cartridges better suited for personal protection than a .22 WMR. Still, as a deterrent, it’s probably as effective as anything else. As for being able to bring about voluntary submission it’s anybody’s guess how this cartridge should be rated; we simply cannot predict psychological reactions. Where the .22 WMR appears to fall short is in its ability to bring about instant involuntary incapacitation.” We haven’t had a good caliber war here for a while. Would you feel confident deploying a .22 wheelgun against a bad guy?