My uncle bought a .454 'raging bull'. The chambers in the cylinder were ground with a reverse taper, and the machining was so bad it looked threaded. He fired 6 rounds, and every piece of brass remained permanently wedged into the cylinder for years. I think he traded it for an air compressor.
I was a kid, but wanted to shoot that thing - no amount of hammering on the ejector would dislodge those cases, so it just sat on the tailgate whenever we were shooting. Used it as a warning about Taurus to every guest we brought with us, or happened to meet while out shooting.