It is very difficult to make a semi-auto .22 Magnum. Long, thin walled cartridge that is susceptible to jamming/crushing. It has been done, but only in a couple pistols (AMT Automag II, and Kel-Tec PMR-30). Ruger made a 10/22 version for a couple years, and then discontinued it. You can still find them used for $700-$900!
The urge to save humanity is almost always a false-face for the urge to rule it.
- H. L. Mencken -