The barrel can be repaired if its the chamber, I did one on an old Enfield replica for a friend as it was a favorite of his, he was recalled to active service for Desert shield/Storm and at the moment the news arrived he was target shooting in his back yard, he became so distracted he walked into the house and just put the enfield away.... loaded, well a few weeks later his wife just put the old rifle on the rack over their fireplace, due to injuries it was 6 years before he got that rifle down off that rack, he had long forgotten it was loaded when put away and intended to just pop a musket cap to clear the flash hole well it went BOOM.... insert t.v memory flash back effect here... he went to run a cleaning patch down it and got bad news at the bottom, the chamber was jugged.... he asked me for ideas as he really didn't want to rebarrel it, what I came up with was to cut out the chamber I then threaded the barrel and made a sleeve just like making a internal choke tube for a shotgun except this one was installed with red loctite then the plug threads were recut, he's been useing that rifle at least twice aweek ever since without any problems in fact I reminded him a couple months ago and he had completally forgotten about it being repaired!
If ya have a smith ya trust in your area remove the plug and have him inspect it with the intention of fitting a new "chamber" into it, I have since done a couple more without even threading them just sweated the sleeve into place both have worked out fine.