Came across this 1848 letter from Thomas Boss to a client on cleaning his Boss and Co. gun:
".... in cleaning barrels, water not warmer than milk is best -- if very hot water is put into them, it extracts all the oil from the Patent breeching and nipples and makes it very difficult to screw them out again. The servant should be careful to oil the inside well after cleaning. Further, servants on cleaning the gun [need to] apply a little raw linseed oil and rub it in with a wad of cloth."
So your best bet is to instruct your servants accordingly and make sure they don't under oil your gun.
Hey, it works for
@TheGerman and I! Bottom line is to make sure you instruct your servants correctly!
Sirhr