Maybe time for KG12 or Tubbs Final Finish
Kg12 is a copper cleaner specifically for barrels with a copper problem.
Tubbs Final Finish is a bore cleaning and polishing kit. Makes a smooth barrel making it hard for lead to grab hold and cling to it. I'm betting looking through it with a naked eye and a light it looks pretty good but a borescope would show you some imperfections you can't see any other way.
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