Which is newer/stonger - Winchester "nickel steel" or "proof steel"?

AEM

New member
I'm looking into buying a replacement barrel for a 12 guage Winchester Model 12. I've seen two; one has the legend "Winchester nickel steel" and the other "Winchester proof steel." Somewhere I've read that one is newer and perhaps stronger than the other.

Can you tell me if that is true, and which would be newer?

Thanks.
 
I dunno the answer but I do have my grand pappy's pre WWI Model 12 and it says "Winchester Nickel Steel" -- Kernel
 
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