231 may seem dirty, but it's a soft dirt and cleans off real easy.
Some of the cleaner burning powders leave less residue, but it can be much harder to remove.
And 231 seems to be very consistent, with little variations in velocity.
Obviously, it's a favorite around here.
Walt Kelly, alias Pogo, sez:
“Don't take life so serious, son, it ain't nohow permanent.”