My dad built an autoloading 17 HMR rifle out of a 10/22 22 Mag. He put an aftermarket stock on, and a carbon fiber barrel, along with a heavier bolt and spring. He never shot it. I inherited it from him and replaced the trigger. It shoots like a dream. The autoloader needs more mass in the bolt and a heavier spring than a standard 22 Mag, or the brass can separate near the case head.
