Flint or percussion? On percussion rifles, I use a drilled-out nipple and a length of rubber hose, and pump hot soapy water in and out of the barrel with a tight-fitting patch, followed by a boiling water rinse and a swab with a patch moistened with Ballistol. It's good to go until the next hunt or target shoot. My flinters have a clamp-on purge hose that fits the flash hole and they get the same procedure.
