Questions like this often opens up a can of worms and replies will be all over the place. I have gone full circle from loose to pellets and now back to loose and loose is where I mostly will stay. Excluding BP and Pyrodex, I have shot most of the replacement propellants. I was also asked to evaluate American Pioneer and some that are no longer made. I have not had the pleasure of testing any Black-Horn so will have to exclude it as well. I would go with 777 and you will notice a bigger bang for your buck with this powder. Just my opinion !!!
Be Safe !!!