Quote:
I am used to using WD40 rust preventative, as a black powder shooter.


I normally only use WD-40 when there is nothing else in the truck. But last season I decided to try it in the barrels of my Brit twist steel hammergun after a few limits of doves with old Gamebore BP loads. I field cleaned the barrels with Ballistol and water, then dried them and swabbed the bores with WD-40. Nine months later, no signs of rust.