I used Universal(Clays) in the 28 ga once or twice when I didn't have Unique. It worked just fine. I have a whole 8 pound jug of Universal but plenty of Unique. I also have a partial can of International(Clays) that I have no use for...It never fit anything well that I was shooting. Have lots of Clays which is a good 12 ga powder...but don't shoot or load 12 ga. and I use 231 for light revolver. I also have some partial kegs of other Hercules/Alliant powders that were hyped and never found them better than R&G Dots...and the other ones they made. Unique Herco and 2400. Blue dot was pretty good too.