I have a Springfield Model 15 that I am having some problems with. After firing .22LR the cases swell up and become difficult to remove with the bolt. Often the extractor slips off the rim and I have to remove the spent cartridge with a screw driver, and once I get the case out it often has ripples in the metal. I am guessing the chamber is too big, which is causing the expansion. I have the spent cases and can post pictures later today. Is there a way to fix the chamber? I had thought about trying to convert this into a .22WMR but didn’t know if that was possible. I have read on other forums where people have successfully did that and this would serve as a perfect candidate since it is not worth that much.