This probably won't answer your question directly but I've read where Winchester 'blued' stainless barrels with what was essentially a coating in hopes of extending barrel life. I mostly think they used the processes on barrel burners. I recently came across this on a 220 swift barrel I acquired. It was stainless (I verified it wouldn't take cold blue, only turned gray) but I was questioned on it and found some obscure references to the process. my bartel was about the same time frame so might be a similar process.....?
Bookmarks