"Unique is meh. Not best at anything."
I didn't say it was "best"
By universally successful I meant that it is the powder with the widest range of applications.
Unique is an amazingly flexible powder that has broad applications across handgun, rifle, and shotgun loading.
That said, I still don't like Unique because of its metering properties.
Here's what Alliant has put together for loading information for Unique. It's an impressively broad list.
https://www.alliantpowder.com/reloaders/Powder.aspx?powderid=3
But it leaves out a lot of cartridges, including rifle cartridges.