I always clean my guns as soon as I get home and have never had a rust problem with any powders I use.
I use machinist water soluble oil mixed rich with water for a patch lube and when done shooting I run a couple of pretty wet T-Shirt material patches down the bore and wipe off around the nipple with them and that may help explain why I have never had a rust problem no matter what powder I use. Then a complete cleaning first chance I get.
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