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It's not possible to "embed" steel wool in gun stainless- no matter how hard you rub.
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I retired as an engineer from a multi-billion dollar world wide corporation. When I was working, I supervised two large, state of the art, metrology labs. I can assure you that you can embed steel into stainless steel and cause discoloration of the stainless. All materials have a "textured" finish to some degree. This is easily seen under magnification and it varies with the surface finish and material being observed. When two surfaces are rubbed together, they exchange material with each other. There are also different types of stainless and different types of steel. Depending on the interaction taking place, enough steel wool particulates can be "embedded" in the stainless to leave discoloration. Many, many gun owners have observed discoloration on their stainless steel guns and don't know what is causing it. In many cases, it's something "embedded" in the surface. That's just the way it is.
Example:
http://nanovea.com/App-Notes/steel-s...terization.pdf
Note 1 Cause:
http://www.sperkoengineering.com/html/Rust.pdf