I guess I'm not seeing the advantages of Blackhorn either. Of the listed advantages:

1. Non-corrosive - I clean my gun after every shooting session, and I doubt I would stop cleaning it because I'm using a different powder. Also, 777 is not very corrosive - once I had to leave the barrel dirty for 3 days straight - when I gave it a good cleaning, the bore was shiny like new.

2. No crud ring - I must be one of the lucky ones, because I've never had much trouble with the crud ring. Of course, I usually swab between shots.

3. No swabbing - I swab anyways - I get better accuracy when shooting sabots that way, and that's pretty much all I'm shooting right now.

4. No frozen breech plugs - This shouldn't be an issue if you dab a little anti-seizecompounds on the threads - spark plug grease costs pennies at Autozone.

So I agree, I'm not seeing the advantages here, at least for me.