Bullseye is about as fast a powder as I can find in my load book I don't think you gave a bullet weight so I can't give you powder weights.
As for the longer barrel Unique, 2400, Blue Dot, and H110 spring to mind. Blue Dot, and H110 burn cleaner than the other two. Unique tends to give you the most loads per pound. Unique also can be used in just about any hand gun or Shotgun load there is, and even some reduced power rifle loads. And I've heard that 2400 is very consistant. (but very dirty)
Hope this helps a bit.