You know, I have read and heard about burning up barrels. I think that with the steel that they are using today, and the powders, technology has come a along way in firearms.
On another forum, I know a guy that has a ruger mark II 264, stainless steel barrel (90's model) and he says that he is at 600 rounds and counting, no accuracy issues as of yet, and I also know a guy on that same forum, that bought a Sendero in 264 and he states that he is at 400 and counting, says that the accuracy is actually getting better as he shoots it more.
So I think that barrel issue may be just the older firearms.
The interarms that I mentioned in the post above, could have a barrel that could burn up in a couple hundred rounds.
Also I don't shoot that much, if i get 100 rounds fired a year out of the 7 rifles that I own, I might be lucky. I would like to shoot more than i do, but unfortunately the things in my life are not permitting me to do so.
Anyway, I think I just talked myself out of the Interarms.