Isn’t the appeal of those things the ability to just replace barrels and have a bunch of different calibers? I thought you could just order them from TC or dealers.
That’s a lot of single shot rounds to smoke a barrel. Unless you have at least 1200 rounds on it then I would look to something else for the cause of whatever’s going on that’s making you think the barrel is done. Ideally that barrel should make it 2000 rounds minimum with the accuracy that rifle is capable of and the speed it’s capable of firing.