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Old April 22, 2021, 10:06 AM   #6
FrankenMauser
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Join Date: August 25, 2008
Location: In the valley above the plain
Posts: 12,799
What you describe is an indication of poor chamber seal, as mentioned by others.

But the 'de-coppering' powders, in general, are very dirty. The primary additive for "de-coppering" is usually Tin dioxide or Bismuth. Doing their job requires leaving residue behind. As such, they're dirty powders.
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