Well thankfully I wasn't using BH209 yesterday. Of course I was shooting a sidelock and it wouldn't work anyway. But it was blowing so hard that I had to shield the wind with my body while pouring into my powder measure and then into the barrel. (I didn't have premeasured tubes cause it was a new barrel and I didn't know what it was going to like. And I didn't know it was that windy out when I left the house.)
BTW - thanks Grouse. good info.