Generally, in any brand of .22, the extractor(s) are spring loaded and will override the cartridge rim. Keep in mind that you load most .22 single shots by putting a cartridge in the chamber, or in a trough in front of the chamber, and closing the bolt on it. I am not home so I can't check my Model 19 for sure. You could take the bolt out and fit a .22 case in its spot with the base in the bolt face and the rim under the extractor. Then push the mouth of the case in direction opposite the extractor. If the extractor bends to allow the case rim to come unhooked you should be ok.