For stubborn leading in the bores the product I go to is Kano Kroil Penetrating Oil. It is also great for removing lead from rifled bores if you shoot lead bullets in pistols or rifles. The key is to give it time to soak to loosen the lead and brush the bore, and repeat. You'll see chunks of lead come out on the patch.
It is also great to have around the garage when you work on things to help loosen rusted hardware.
They sell this on Midway USA.
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