My vote is HS-6. I can load it in all my semi pistols from 9mm, 357sig, 40SW, and 45ACP with very good fast performance. But also use it as medium load in my 357mag, 38Special+P, and 44mag. It meters real good. Clean burning.

I was going to say unique. But after I am finished with this 2lbs I have I think I am done with it. Too dirty. Doesn't meter well.