To be clear, Alliant is a manufacturer, they make Clay Dot, Red Dot, Unique & Green Dot.
While you can use Unique for almost anything and I always have some on hand, it's not the optional light shot load powder. Look at Alliants on line Manual all the Unique loads are for heavy shot charges. 3/4 & 7/8 oz you will get un burned powder and the recommended charges with heavy shot loads are much larger = fewer loads per pound.
12 G no doubt about it in Alliants line, Clay Dot or Red Dot are optional for 7/8 or 1 oz . You can use Green Dot but it's slower and charge weights are 25-30%,higher = back to fewer loads per pound
16 G you are on your own, little current published data and all of it with cycling Automatics in mind 1 1/8 oz shot loads mostly . Find the 16 G Society on line, they have collected lot of old data on 16 that can be used today. I am using Green Dot based on 16 g society loads. can't give it 100% recommendation just yet.
Assuming you don't want 1 1/8 oz loads either gauge, you need two powders minimum . All opinion and somebody else may have another.
William
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