i was a former bore butter addict. used it for years on my muzzleloaders inside and out. it was o.k. in general but didnt protect very well around the nipple on the barrel. i had nasty almost burn like stains in the metal. several years back i had a barrel sent into thompson center because a nipple snapped off ( threads coated with bore butter) and they re-finished the barrel back to new. since then i have always used gun oil like sheath or shooters choice fp-10 and synthetic grease on the nipple threads. the barrel still looks brand new. my own conclusion is that bore butter doesnt not compete with a modern gun oil. just because the oil doenst slap on and stick like greasey bore butter doesnt mean its not doing anything. some oils penetrate the pores of the metal and protect very well. i also love the natural lanolin based stuff called- fluid film. that stuff goes on kinda thick and has long term protecting qualities.