Take a bamboo skewer (found at the grocery store) and split it lengthwise about an inch.
Insert a folded piece of 60 grit sandpaper and tape the end.
Put the other end of the skewer in a drill and run it slooowly in the clean, dry, cool chamber for about 30 seconds. Be sure you do get into the lead.
Swab out the barrel and repeat.
Now, stuff the CLEAN, DRY chamber full of paper towels. Throw the barrel in the oven at about 150 degrees for half an hour or so. (You will not compromise the metal until way above that temp!)
Using hot pads, pull the barrel out and remove the paper toweling. It will be soaked with cosmoline.
While it's warm, wipe the chamber with more paper towels the best you can, repeat, and keep repeating until cool.
Repeat the process, then let the barrel cool naturally. No sense in risking brittleness by cooling it with water, though the temp is low enough I doubt that would happen anyway.
The first step gets rid of surface cosmoline, which dries into a clear, hard film.
The second step sweats it out of the metal's pores.
Hope this helps!
Is it better to live by a corrupt society's standards rather than face persecution for not doing the same? This is the dilemma we now face. We must hold fast to our convictions as we confront this dilemma. Knowing one's self goes a long way in the crisis. - Me