I have personally tried using a 357 case , sharpened and flared to fit the cylinder well . It was only partially successful . It did NOT completely remove all the crud . The bore brush , a piece of Chore Boy and some solvent cured my problem . YOu can spin the bore brush on a drill or just do the scrubbing by hand , either way works well . Now it's up to you to find out what works and what doesn't work , good luck .