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Alright then,I'm sure there are folks with greater expertise who can give you much advise about what to do next,but I suspect you may be getting something other than pure powder fouling .You may have already stated this,but I think perhaps if you are keeping the copper fouling cleaned out,the powder fouling has also been removed.The bore was "blued"(Hot caustic black oxide)
Perhaps,so long as the metal fouling is kept to a minimum,ignore a little black on the patch.Shooting will burnish it over time.
Now,I invite more discussion from the benchrest folks!
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