I've seen this in a few threads but haven't seen an explanation. What happens to stainless in the cold and at what temp does it become a problem? Thanks

Now, there's a topic that I've never heard of or even considered being a problem. Will be interesting to see the comments.

It's no secret that some steels get brittle at low temperatures. I don't know how bad stainless barrel steel is, but Krieger doesn't recommend it. There's links in my post in this thread.
http://www.shootersforum.com/showthread.htm?t=44076

Of course, kdub is more concerned about barrels melting in the Arizona summer. :p

Bye
Jack

Tikka had a major problem with this about 3 or 4 years ago, they were fine until about 10 to 20 degrees Fahrenheit, then a few of them split into a rather neat banana peel shape.

Of course, not all stainless steel is like that, and Tikka has corrected the problem, but it can and does happen.