I took my m44 to the range today and after I shot what I think was 8 shots, I went to eject the second shells out of the last 4 shells I put into the carbine AND IT WOULDN'T COME OUT. We looked into the chamber and the shell swelled up and plugged the chamber. I know that some loads swell when you shoot them. when we got home I messed around with it and tried to fix it and came to the conclusion that the bolt needed to be cleaned to the point that the extractor was so dirty that it wouldn't move enough to clip onto the rim of the shell and properly extract the shell after firing. My dad's 91-30 had the same swelling problem but I could always get the bolt up eventually. I know there are other factors that come into effect and cause mosins (including the m44) to do that. Please help!!!!!!!!! I shoot the old surplus shells.