Re: action and barrel coating
All of my hunting rifles are stainless... I would never even consider a blued action/barrel. But what benchracer said is right on. if your gun is never going to see rain/snow/humidity/etc, then stainless will not do much for you. I backpack hunt and my gun is going to be more or less wet every morning. in the tent there is too much condensation from breathing, and outside everything is covered in dew.
although, the first elk rifle i bought over two decades ago was blued, and when I installed a custom stainless barrel I had the entire setup teflon coated. I hunted with that rifle for years in a lot of bad weather and the teflon protected the action perfectly.
And even though my guns are stainless, i still teflon coat them. The guy that did the work on my rifles owns blackicecoatings.com and his work is exellent. I would highly recommend them. Very affordable too.