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Bore tech C4 works well. Soak a cloth with it and leave it in the fouled area to soak - several hours or overnight. I soak stainless steel revolver cylinders in Bore Tech C4 overnight and the baked-on stuff wipes off with a rag.
For the cleanest shooting handloads, use lead-free primers. Most of that black crap is from regular (leaded) primers. There's an article in the April 2020 issue of Shooting Times on lead-free primers.
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