Lube/powder combination that causes rust?

[Silvercreek Farmer]

I have a faint memory of some lube/smokeless powder combination that resulted in rapid barrel rusting. Anyone recall this?

[Outpost75]

Any combination with Pyrodex. More corrosive than black.

[Walks]

Yup,
1st used Pyrodex in early 1990's. Shot in Uberti 1860. Ran an oiled patch down bore and chambers. Got home an hour later, rust was forming on outside of bbl assembly and frame. Not enough to pit, but enough to remove blue. Never used in Handguns again.