When you cleaned the barrel, did you see any lead flakes come out on the patch ? Did you look down the barrel to see if there were any deposits in the barrel ? If there are remaing deposits in the barrel, they tend to promote more leading. I have fired 100's of rounds without degrade in accuracy from 1911's and revolvers using ammo with my cast bullets and properly fit to my guns. Another thing that can cause leading is revolver chamber throats that are smaller than the bore of the barrel.
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