To cover the range mentioned I would want at least three powders. As I have always leaned toward the Hercules/Alliant powders my pick here would likely be Red Dot, Unique & Blue Dot.
Unique is an extremely versatile powder but it is not well suited for low-pressure loads of 1oz or less in a 12 nor is it suited for heavy shot charges at enhanced velocities.
Some years back the Rifleman published a 3de-1˝ oz load using Unique with both card & plastic wads. It was said to have been pressure & velocity tested by Hercules but to my knowledge never appeared in their loading guides. The pressure was not LOW but was within SAAMI standards.
