[Unclenick]

Regarding carbon, that is broadly true. But adding graphite doesn't help and a powder whose burn rate is controlled by surface deterrent coatings, like 231, will need even more pressure not to be dirtier.

On a couple of different occasions, I've done some high volume shooting with one of my 1911's, running 750 to 1000 rounds a day for three days without cleaning, shooting loads of about 5 grains of Bullseye behind 200-grain LSWC's. My hands would come away looking like I'd spent all day working in a pencil lead factory, and the gun had silvery graphite streaks spreading out from under the edges of the grip panels and over the Pakerizing and through the trigger guard and about anywhere else. Not carbon streaks, to the naked eye; just graphite. Apparently, graphite blows around more easily. Quite a mess.