Oh, another thing: Make sure your chamber is clean. With a .22, it's possible for the chamber to get so dirty that a round doesn't chamber cleanly and easily, and then the extractor acts as a fixed firing pin. This is particularly dangerous because it can happen with the round only halfway chambered--an "out of battery" ignition, which is LOUD and sends brass shrapnel out the ejection port (and also sometimes wrecks the magazine).
This isn't normally a problem with factory 10/22s, as they come from the factory with very generous chambers. But the SR22s seem to shoot more accurately than regular 10/22s, which leads me to believe they might have different barrel specs, including tighter chambers.