Blackhorn has its pros and cons. It really isn't any less corrosive than 777 (I clean both if I take a shot and won't be using the gun again for at least half a day), it is actually harder to clean than 777 (777 always has cleaned up quickly for me with water, whereas Blackhorn requires powder solvent, elbow grease, and time), but Blackhorn provides more velocity, and doesn't give the buildup/crud rings between shots.
I'm honestly considering going back to 777 due to crazy prices and the pain in cleaning the Blackhorn