I have a 50 caliber Hawken style rifle that has a ball lodged in the barrel. I had loaded it for a deer hunt, but did not get a shot that weekend, and went the following week. when I shot it the percussion cap went off, and there was a small flash from the nipple but the main charge did not go off. I tried shooting it again but all the went off was the cap. I tried the screw on the end of the ramrod but it won't screw into the lead. I thought about removing the nipple and pouring ten grains of FFFg into the hole and seeing if that will ignite the charge, but am hesitant to blow something up. I was on a range at Grafenwoher, Germany when a 120mm main gun round on a M1A1 tank in 4/8 Cavalry went off in the turret, killing the gunner and TC, so you can understand my caution were gunpowder is concerned. Does anyone have a suggestion? I have heard you can screw a grease fitting in place of the nipple and pump enough grease to push it out but not sure I want to clean up the mess.