I had the same problem with a cleaning brush. Here's what a gunsmith told me. If your patch won't hold back enough gas to clear the barrel, take out the nipple/ touch hole. Heat bee's wax( not parafin, it cools to quick) Run a swab up the barrel to the obstruction and let it there. Pour enough wax into the touch hole to form a plug( leave enough room for powder) Let it cool, remove the swab, work powder into the touch hole, and fire the plug out. Make sure there isn't any extra room between the powder and the plug or it'll act like a ball that's not seated. It worked great for me.