I'm still not all that satisfied with the way my Howa mini is shooting, but so far H335 has been the most accurate powder I've tried, followed by TAC. That is with a 123 SST. Haven't chronographed it yet, which is something I need to do.
I've got a lot of H322, maybe I need to try some of that.
My Howa Mini shot the 123SST extremely well with 748 Win, but the velocity was just abysmal. I don't have my notes on hand, but I'm thinking it was 2250fps ballpark.
