Steve P
Just my opinion... Same as T7 mag pellets... T7 is white when it is manufactured and a black dye and charcoal are added...
Starting pellets, other Pyro pellets, with a #11 or Musket cap is a risky business.
I would highly suggest that you work with loose powder. I use T7-2f and really am happy with it. BH-209 is a great powder but to expensive for me