No Mike... Bore Butter was the likely source of his rusty bore. In 25 years, you just have never made a mistake applying it -- while the prior user in this case did.

Usinggood gun oils, you can sweep away any left-over moisture in the rifling.... ie... water soluble.With thickened, non-soluble bore butter, it goes right over the top of the moisture & traps it underneath -- causing rust within days sometimes.

If not lubing conicals, throw that BB right in the garbage. Why???... because no one alive is perfect & mistakes are common with every person breathing on earth.

Posters Mike Hill and poster Roundball have been mistake-free thus far. But tomorrow is another day & your odds at maintaining that perfect score for another 25 years are not very good.