Bergmann
40 Cal
I've had good luck using cans of compressed air designed for cleaning computers! The main thing is to blow any oil or fouling into the bore so a patch can pick it up and remove it! Electrical contact cleaner works well also; for me the canned air is just cheaper and easier to come by! I haven't tried Brake cleaner - yet.A majority of all misfires upon loading the first shot on a clean rifle is a dirty nipple, drum or bolster regardless of powder used. One or all of them is full of oil and uncleaned crud. I rarely shoot percussion anymore but when I do I pull the nipple and clean it and blast everything out with a can of brake cleaner (using the straw that comes with the can) prior to shooting. Let it evaporate and then put in a little powder and fire off a blank. If everything is full of oil and crud, firing off a few caps won’t clear a fouled up mess of oil and crud. If everything is clean you shouldn’t need a musket cap period.