Of course there is a small caliber that I really like...North American Arms that holds 2 22mag rounds. I keep it next to my wallet...pull out my wallet and let em have it :)
Heh. Check this out:
"Used for self defence in a revolver, the .22 WMR has compiled a 42% one shot stop rate according to Marshall and Sanow. This is far superior to the .22 LR and .25 ACP, and makes the .22 WMR the best of the small bore handgun cartridges." Something like Mach 1.5 out of a 6-1/2" barrel.
Oh good. A shopping excuse. Now I want one.