Well there are many things to consider but if you get crud ring from 777 you will wish you had never seen the stuff. my guess is about 70 to 80 % do.
Pyrodex is a good dependable powder and it will shoot almost as accurate as Blackhorn as Cayugad says it is good as any powder up to 100 yds actually I would say a bit further.
Not all of us shoot in out backyard like Cayugad and the clean up process wit Pyrodex is kind of smelly clean up in less than 5 minutes any place we happen to be with Blackhorn is a real +for some of us, then there are those of us that hunt the plains and the Midwest cornfields or even some mountains and when you need that flat trajectory and like here where there are bear deer and hogs with legal multiples on every thing but bear those dead accurate second third and on and on with out hesitation or cleaning do make a difference. So think about it and if you can try a small amount of each powder before you make your decision.