Been using Unique for 40 years or so. Can use it in shotguns, pistols, some rifles. It is a very useful powder. Get a reloading manual for load data, they have a lot of other very useful data.
I decided to lay in a big supply of at least one powder. Unique was the one I selected. It will power not just every cartridge I currently reload, but every one I'm even thinking of buying.
I've had no problems loading it down to the 3.0-3.5 grain range in my Lee Auto-Disk. As reliable as Bullseye in that regard.
At the other end of the spectrum, I use it in .44 Magnum to the tune of 11.4 grains. Using the somewhat inconsistent Micro-Adjustable Charge Bar, the largest variance I ever got was +.3 grains--not bad for a charge of that size.