great info,i really hate wd-40.but thats something. you know, i have been using only bore butter from 1971 in my hawkins t/c and no rust i can see.but i had been using hoppes no.9 after washing barrel in hot water/soap then hoppes, then bore butter. now, i dont use bore butter to store. i use birchwood sheath. all those years and no trouble, now i change. oh well.