What is the deal with the availability of some Vihtivuori powders. My guy at the gun shows has not had much of it the last two times. He has had no N320 or N330. I checked with Powder Valley a couple of weeks ago and they had 1 & 4 lb jugs of N320 and tonight they have no 4 lb jugs and are out of a lot of Vihtivuori powders.