RR,
That could be, but, the pictures I've seen of late are "freshly" blown guns, usually, with a description of how they did it. One unlucky gun had been re-case colored, not by the torch, but a legitamate bone/charcoal outfit. I wish Dr. Gaddy were here to comment.

Silvers,
The comparison between Fox "Chromox" barrels and Winchester "Proof Steel" tubes is flawed by the fact that Winchester used chrome moly steel, not chrome vanadium. "More Difficult" to wet in a soldering operation doesn't mean "Impossible to wet" either, as there are many that haven't had a problem. A popped rib is an ugly problem to have, however.
Best,
Ted