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Old January 1, 2012, 05:39 AM   #7
Senior Member
Join Date: September 8, 2007
Location: Mississippi
Posts: 14,163
I am not rightly sure of Pyrodex and other BP substitutes, but the real Black Powder residue is hygroscopic- it attracts water ..... even out of the air.

Water will rust steel, especially when combined with the BP fouling.....
That's true but it's not an immediate reaction. I sometimes go two or three days before cleaning after shooting Pyrodex and it has a worse rep than black.
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