RE: Bore Butter
Bore butter encourages corrosion. Be sure if you use bore butter, it is before shooting to possibly help the projectile slide in the barrel easier, but never leave it in the barrel. As mentioned, it will seal moisture against the steel and eat the snot out of your metal. Ruined the breech end of a really nice Encore by not fully understanding the properties of bore butter. I'll never use it as a protectant.