I'd agree that I'd rather use Unique for the calibers you mention rather than Power Pistol if you only want to use one powder for all. Power Pistol would be better for maximum top velocities with some of your loads. I've settled on buying different powders for most calibers. I like Accurate Arms #2 for .38 special, Winchester Super Field WSF for 40 S&W, Unique and AA#5 for 45 ACP, and I only load jacketed loads in .357 Mag and AA#9 is the best I've used for magnum loads. Unique is unique in that it will load all the calibers you mentioned rather well. Some say Unique burns dirty at low pressure ranges and some don't like how it meters thru their powder measures.
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