I've been reloading 9mm ammo with W231 for years and like it very much. It's very accurate in my loads. I use 115 gr. bullets in almost all my reloads. I tried several other powders said to be good for 9mm initially, but had poor results. Once I got some W231 and tried it, I knew I had found the right powder. I always load full power loads, not target loads.
I also use W231 to reload .380 auto. with great success.