I found this page some time ago. It has some interesting experiments especially in regards to rust. Allowing rust on a firearm is a mortal, not a venal, sin and like other sins, such as wearing a baseball cap backwards, should be avoided. Last week, on a day that it seemed that I had too much time on my hands, I took the barrel off my Stevens .40-65 to see if it would headspace correctly on my schuetzen. You know, there are days when wind is a problem. Well, it didn't but the loose Stevens threads apparently allow moisture in. I like to use WD-40 where I have used soapy water or Windex despite all the rude things said about it and have had good results up to now. I think that I will use Ballistol in the future and see if that isn't better.