I had that problem with a VH after only a short time after shooting it. (Maybe 2-3 hours later after I got home). I now carry one of those TICO fuzzy sticks and before I place them in the gun draw I run it down the bores with a little oil sprayed into the chambers. I then wipe the breech face down and place them in a silicone gun sock or soft case with the sock. I can't explain why only your hammer guns do it but I'd be willing to bet that it has something to do with the surface texture of the metal (for the lack of a better term) and placing a warm gun into a cool environment causing condensation. The rougher surfaces would tend to attract debris which would attract moisture. Just a guess.
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