I have used a funny looking yellow waxy feeling lead removal cloth product for at least 40 years. Mine is currently locked in the tool box in the camper so I don't know what the name or MFG is.  I think it was called "lead wipe-away" or something like that. It was used by revolver shooters to wipe cylinder gap and magna-port  flash deposits. I have no idea what is in it.  It comes sealed in a plastic bag I have bought several over the years.  I open the bag cut a patch and then seal it back up.  I use the patch with a pretty tight jag and it usually wipes it right out in a pass or too--if the bore is decent.   
I have also used the brass wire Lewis Lead Remover patches and finer grades of steel wool wound on an old brass bore brush

On a leaded pitted bore one old trick was to cork up a couple ounces of mercury in it and then slosh it back and forth for a couple times every day.  After a few days of this uncork it and pour the HG back into the storage container and it will take the lead with it.  Not sure of the chemical or mechanics of it---but it works.  Of course we all know that HG is toxic, like lead is, or maybe a little more so, and its probably a federal offense to own nowadays so I doubt that anyone has any on hand, but if they did  .  .  .  .  .

Chore Boy is a coarse copper wool ball used to scrub pots, wrapped around a bronze bore brush it takes the lead out from my 1911 barrels in about 60 seconds, no chemicals, very fast.