Get one of the CO2 dischargers for muzzleloaders....works like a charm. A full CO2 cartridge will blow out both balls and the powder with no problem. Spray a shot of WD-40 or simular down the barrell for some extra slip. you could also take the nipple out and use an air blow gun with a rubber tip connected to a compressed air line. MAKE SURE THE BARRELL IS POINTED IN A SAFE DIRECTION. Those balls will come rocketing out the barrel.