A big part of the "dirty" equation is not the powder, but the lube on the bullets. I use Bullseye in both my 1911 .45 wad gun and a 1911 .38 Special conversion. The .45 is always gunks up from the lube on the bullets, whereas the .38 doesn't at all since I'm using Hornady full wadcutters that have a dry lube on them.
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