Everyone else seems to like the powder... why not the black flys? Just kidding. I do not think it has anything to do with the powder your shooting. It might have more to do with location, wind conditions, who knows. We are blessed with the little buggers here too. Just wear some bug spray with deet and the black flys will leave you alone. Although I will do this.. the next time I shoot I will make a note to watch and see if the black flys come around when shooting Triple Se7en. They sure scatter when you are shooting Goex...

Just have fun shooting.