Do not know if you have heavily cleaned the barrels, by heavily i mean soaked with solvent , brushed and again. Then use a tornado brush or some other stiff brush with lead remover solvent and do it again. I have had a number of vintage barrels that looked like a mile of bad road because only a cursory run a patch through cleaning had ever been done leaving a hundred years of leading to accumulate. Have had some surprising results, not perfect barrels but much better than first thought.
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