Bulleye is faster burning and often used in small pistol loads, it uses little powder, so it lasts a long time. Unique is also a fast powder but slower than bullseye and used in larger quintiles, but both are on the fast side. If you use 7 grains of Unique, you would use about 3 or 4 grains of Bullseye, on average. They serve different purposes and one should not replace the other with the same charge. You can find the right powder load in any loading manual.
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