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I have had bad results with aa 2, seemed awful sooty, but maybe that was just my minimal loads. I think that 231 was the cleanest I have used for low pressure loads in that round.
The point was made that graphite contributes to soot. It really does. try to minimize use of heavily graphited powders, for example, if it is just black as pitch and shines like a mirror, there is a bit of graphite on it.
If you are using the light loads, the faster powders will leave less residue since it will burn most efficiently.
Your question would be answered far more capably by sending a posted letter to either hodgdon or alliant, as well as inquiring on the website.
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