458 Lott, I've found Universal and WSF to both be just as accurate as Unique, in a wide range of different loads. One particular load (230gr cast RN .45 in a 1911) showed a distinct improvement with Universal, but as a general average, all three powders have performed about the same for me.
Of those three powders, my only reason for choosing one over the other is just metering consistency, with WSF metering the best, and Unique the worst (although still completely acceptable).
I like Power Pistol too, but it seems at it's best with slightly warmer loads, and does produce quite a bit of flash. It's an easy powder to work with though.
