VAHunter - I love it the BH209. Not swabbing between shots at the range is a big deal for me, and BH209's non-hydroscopic properties are another HUGE plus. Last year I had the unfortunate experience of having the same load in the gun for 7 straight weeks (read - no deer to shoot at and did lots of hunting) and it went bang when I fired it after the season closed.
Ohboy - Aren't they calling for 11 mph winds? That's not so bad, IMO. If you can't stand being in the treestand, it's a perfect time to get down and still hunt. The wind will help conceal your movement and your sound.
If any of you haven't checked out the Blackpowder subforum here, I suggest you do so. Lots of knowledgeable folks there, and lots of quirky banter. And the subject of BH209 comes up, oh...I dunno...just about every day.