UNIVERSAL Clays gunpowder handles the broadest spectrum of cartridges for both pistol and shotgun. This is the Clays gunpowder technology designed for 28 gauge shooters. From the 25 ACP to the 44 magnum and 28 gauge to 12 gauge, UNIVERSAL CLAYS gunpowder provides outstanding performance. As with all the "CLAYS" gunpowder series powders, clean burning and uniformity are part of its attributes.
Big Book Catalog, Issue:67, Page:526
Sinclair, Issue:4B, Page:094