As for shooting 45 Colt loads in a 454 Casull or 460 S&W Magnum revolver; don't. If you do it very much and then try to shoot full house 454 or 460 S&W cartridges in the cylinders designed for them, you will have extraction difficulties. If you've actually "ringed" the cylinder chambers, no amount of cleaning or scrubbing will solve your problem.
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