One powder I picked for specific use I just keep finding more things its good at is Herco.
Basically I use it as my Unique load fix it. Loads I want just a little more but am at the pressure max with Unique.
With Herco you can add an extra gr of powder and up the velocity. For the same pressure.
Or if you found the accuracy at a lower pressure Unique load but not getting the velocity you want. Load up Herco one grain higher than Unique take a 1000 fps load and get it too 1100 and keep the accuracy.
It is my go to powder now for my Rossi 357 lever gun. 30-30 cast loads. Works ok in my Black Hawk.
Not a powder for short barrel snubbies though. Too slow burning for that.