RE: Bore Butter causes rust??
I remove the breech plug, put the end in a bucket of soapy water, pump a patch up and down. Turn the barrel around and do the same. Then I run a presoaked patch of TC#13 up and down, in and out. Then I run a brush through a couple of times. Then an alcohol patch. Then I take a mop and liberally saturate it with BC Sheath and run it through till it drips out the ends. Then I run a dry patch thru to take up the excess BC Sheath. I do it again with a fresh dry patch to make sure it is dry. I install my cleaned and anti-seized plug.
The moisture is totally removed with the BC Sheath and then the excess Sheath is removed. I run the Sheath before installing the plug so no puddles form at the bottom of the barrel. I don't Sheath the plug. When I go to shoot I just run an alcohol patch to remove the thin film of Sheath that remained. Sounds complicated but takes 20 minutes at most.