It's best to use Cerrosafe, as it's shrinkage is known, which is a very small amount, and it is easier to do. You can get it from Brownell's.
To use it, you have to oil and plug the bore about an inch or so back from the muzzle with a patch, and pour this in the muzzle. Then, using a cleaning rod, you tap it out the front. It's the same process as casting the chamber, but from the other end.
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