The excess residue is caused by not burning all of the powder.The modern hot loads get additional velocity by using powders that burn almost completely.That is why they leave the barrels cleaner looking.Another problem with modern Hoppes #9 is that they have reformulated it and it is not as strong as it used to be.As Horace would say "they took the animosity out of it."I bought a full bottle of the old stuff at an antique mall of all places.when you opened it,the odor hit you.It smells like a gun.The new stuff just ain't the same.
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