Actually, what Hodgdon says about 777 is that "all propellants are corrosive to some extent.", which is a weasle-worded admission that 777 IS CORROSIVE!! Yes, it is!!, and the only way I've found to keep it from rusting a bore is to thoroughly clean it out with plain water, just after you get done shooting, just as you would if you had been shooting black powder. However, it does dissolve and cleans out with just plain water much faster and easier than black powder fouling does. I tested it by leaving an old cheap gun uncleaned for a day, and it picked up rust overnight. I also tested GOEX Clear Shot the same way, and was able to leave the gun uncleaned for two weeks here in southern PA, and there was no rusting at all, so I believe GOEX's claim for this powder.

Keep yore powder dry!!