I have both N350 and some N320. A friend of mine bought a Bill Wilson .38 super limited carry gun that Bill recommended the N320. So I loaded some for him, however they were not for competition. That said, I didn't know if it was a good powder for my Open STI. Seems the general opinion is that it is not. N350 would be better and I have been shooting that powder in my loads for years with no problems.