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Get a smith to cut off the back end. Then rechamber. Only a little (2" or so) needs to be cut off. I've had this done a few times and it certainly didn't affect the accuracy of an old Husqvarna that I've had since I was 9. In my cases throat erosion was the problem.
I have lined a bunch of rimfire chambers and it works out fine. Some are more easily done than others. Often a slight set-back is the easier and more effective option. Regards, Bill.