I am so happy this thread came about.. I have been waiting the share this one. I am a pistolsmith in the Carson City area of Nevada. I do some general smithing but no barrels or muzzle brakes, there is a wizard in Carson that does that kind of work on an hourly basis. well a guy came into my shop and asked me to inspect his rifle and tell him if there was anything wrong with it. I start tearing it apart and see nothing wrong with it, the lugs are great, the bolt lugs are great, no setback on the receiver, the pin ejector was not even stuck/bent. I then measured the bore. OOOPSIE! did you know you can get a 338 Win Mag in a 300 RUM chamber? It will fire and come out the barrel. well I told the guy what damage had happened to his gun. the story on the 338 through the 300 is his friend borrowed the rifle for a Elk hunt, his kid handed him a round, he chambered it an fired it. the kid was holding the ammo for all the guys in the hunting party, he got the boxes mixed up and gave this guy the wrong ammo. Now the gun has a 0.311" bore. I sort of started laughing and told the guy he could start using 7.62X54 slugs. The guy laughed with me and said he would like the barrel replaced. I had my doubts but a quick check of the ring of the receiver showed the ring had not been expanded. I asked Remington themselves and they said it should be good still. the wizard was 3 months behind so the gun went off the Hart barrels and came back with a new hart attached. the guy reports the gun shoots so well that he has vowed never to lend the gun out again.
I personally would not have wanted to be the guy shooting this gun with a 338 Win Mag in the chamber. it must have done some real hard recoiling.