Had a similar problem once. I drilled the bullet through the barrel with a 1/4" diameter aircraft (12" long) drill bit, protected by a 3/8" diameter piece of wooden dowel rod that I drilled and turned down a bit on the lathe. You could also protect the barrel with a short length of neoprene or poly tubing. After drilling the bullet, I poured WD-40 down the barrel to neutralize the powder.
After I was satisfied that the cartridge was rendered inert, I turned an aluminum barrel plug with a hole tapped for a Zerk (grease) fitting, which I fit tightly to the end of the barrel and held in place with a modified C-clamp along its length. Now for the easy part: snap a grease gun onto the fitting, and in a dozen or so pumps, the cartridge will be forced out. A grease gun exerts tons of pressure, but makes a terrific mess.
You can bring this gun back to life.
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