i use vv320...vv340...3N37...3n38... VV350...vv 330...for my different pistol calibers.what i like is that,this powder burns super clean,meter great in my XL650 , and is 100% consistent from batch to batch.i load 9mm ,45acp and 40 S&W with all the powders mentioned.the 350 is very,very fast for 9mm,not exactly recommended,it is more dedicated to magnum calibers,but i found a super dooper load for one of my steel 9mm.
some will tell you that it doesn't worth it,too expensive and blahblahblah,but i like the no smoke and clean burning factor ;i use Vihtavuori powders exclusively.