That's why the kind of durable electro-nickel plating that Traditions coats their barrels with inside and outis so desirable. Nickelsimply doesnotrust.
There's different kinds of stainlessand I don't know much about them, but nickel isan ingredient in many alloys including SSbecause it's strong, heat resistantandwon't rust.
There's Chromium lined barrels too, and Investarms used to make them a long time ago. But every process is different regarding howaccuracy will beaffected.
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The added nickel helps to determines thepropertiesof a SS alloy, so it'sa very goodelement to have a barrel coated with. The Traditions coating is matte, it's slick and shoots very accurately. I believe that it can stain if not properly cleaned but I haven't actually experienced that.
Stainless steel is an alloy that starts with basic iron with up to 8 alloys added, depending on the quality. The major alloys in stainless steel are chromium and nickel. The chromium provides rust and corrosion resistance and durability. Nickel provides additional rust resistance, hardness, and high polishing characteristics.
The numbers 18/0, 18/8 and 8/10 refer to the percentage of content of chromium and nickel. To be classified as stainless steel, the metal must contain at least 11 % chromium (no nickel required). Stainless steel used in cookware is normally 18% chromium and 8% to 10% nickel.
http://missvickie.com/resources/cookware/1stainless.html