CAUTION: The following post includes loading data beyond or not covered by currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The Firing Line, nor the staff of TFL assume any liability for any damage or injury resulting from use of this information.
Rebs,
Bullseye has graphite on it that blows around, leaving things gray. But it doesn't get sooty until you are really underloaded.
Most likely you don't realize how much you reduced pressure by using a bullet that doesn't seat as deeply as the wadcutter. I don't have data on your bullet length or the COL you are loading it to, but if I use Speer's COL of 1.44" with their 158 grain LSWC, QuickLOAD thinks you'll need 3.8 grains of Bullseye to come up to match the peak pressure your Wadcutter load. You 45 load is operating at about that same pressure (about 12,500 psi in QL). So I would try 3.5 grains (the Alliant maximum) but understanding your particular gun may need even more.