Any suggestions for removing heavy leading from shotgun barrels? I use a Payne-Gallwey brush but mechanical action only seems to go so far. As lead is inert I suspect there won't be many chemical solutions to the problem. I have just had my gunsmith lap and polish the barrel of one gun so hopefully the high finish will reduce leading in that but I can't afford to do them all. Turks head brushes might seem the way forward but my gunsmith reckons they're not any more effective than a Payne-Gallwey and in any case nobody seems to stock them. I'm disinclined to use the old method of mopping up the lead in mercury - too toxic even for me!