Copper seems to be the best for purging lead from the barrel. If you feel safe shooting it, shoot some copper plated ammo through it. That should remove the bulk of the lead. If you don't feel safe shooting it, give it a generous soaking of Hoppe's solvent over a few hours - then pull strands from a copper pot scrubbing pad and wrap several strands around a bore brush. You'll want to have a quality cleaning rod because it will take some force to push it through the barrel. The copper is harder than the lead, but softer than the barrel. Add strands of copper until you reach your comfort level of what you can push through your barrel. Usually a few passes will clear the majority of the lead.
After experiencing some lead fouling in the past, I try to end my shooting sessions with a few copper jacketed rounds.
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