Some powders do burn clean or dirty. If you were reloading and the powder seemed fine so far as residue, and you went a lesser payload or powder and there was more reisue, then yes you could say there was incomplete combustion and maybe a different combination should be used. As far as wad pressure you need no more than just enough to seat the wad against the powder. Any more and you're just collapsing the cushion part of the wad which defeats it's purpose. Paul
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Paul Harm
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