Just for reference, I went to the Titegroup after terrible problems tying up the revolver with unburned powder using Clays at similar power levels. Since I shoot only one match per year at the lower power factors, it's really not an issue. For USPSA major, which is pretty much all I shoot, it's clean, clean, clean. The soot I refer to is the dark deposit left on the gun after firing, not the flakey stuff you describe.
Overall, very happy with the powder, just need to recognize its limitations.
Steve
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