I’m on the last pound of 231... never loaded Unique in .45, tho it’s an easy swap... and I don’t own a 9... doesn’t mean I dont load it...
Give it a try, Unique is a good all around powder. Yes, there are likely other better for certain loads or guns but I like to keep it simple. Older folks tend to confused with too many choices. :-)
Get five reloaders together and you’ll get ten opinions on any given load or caliber.
We’re using 231 on the 45 I think... our bad intell said that 4.2 gr on 231 would do for the 9mm... that was a lie...