I have a Savage 10 myself and I live in Central Texas so it's hot and extremely humid.. I have not ran into your problem and haven't shot the gun in a year but do check it and all of them about every 6 months or so... I simply run an oily patch after cleaning of slip 2000 ewl and use foaming bore cleaner myself.... I would stop using that stuff , that's twice it has happened to you... I think you have figured out the problem... My Savage 10 was checked about 2-3 weeks ago and no signs of rust anywhere... It's happened to your gun twice since I last shot mine... My storage conditions are the same as yours....
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