Didn't realize how popular Red Dot was for cast 9mm.
I use Promo so far with cast bullets in 9mm, 40, and 45ACP. The density is not guaranteed like with Red Dot, so I suppose it might be slightly different, mind. But I found after working up my loads, I ended up with exactly the same charge volumes as with Unique, in these particular calibers, using the same bullets. And per the data, I'm right at the max for both powders.
Per my measurements, Unique has a density of 7.82 gr/cc, and my particular jug of Promo is 6.93.
I also ended up at the same throw for 125 cast in 9mm as I do with 180 cast in 40 with both powders.
Only gripe is there's no visual difference between Promo and Unique.