We once had a customer bring us a rifle that had saved his life. With a stupidly overloaded round, with the remains of the case still in the breach and the casehead firmly welded, yes welded to the bolt face. I have no idea what held this rifle together but the fool actually wanted us to fix it. We couldn't even get the case head off the bolt face!!!!! We figured that the total cost would far exceed the value of the piece and told him so. After all, with preasures like that, the bolt locking lugs tend to "Seat" themselves back into the action, so once you remove the barrel from the action, you would have to turn the inside of the action flat, rechamber the barrel and have no idea if the thing would work at all. With "Set back" that severe, we suspected that even after trueing the inside of the action at the locking lugs, the metal would tend to remember where is was displaced to and .....well think you get the point. He was actually mad at us that we would not do the work!
Scott