My turn:
1) How much do you spend in ammo, black powder and cleaning supplies to keep your shooting edge each week?
I shoot mostly black powder and my costs are not too high as I don't have the time to shoot as often as I'd like. For my Pyrodex RS and P, I usually wait until it goes on sale at Walmart and clear the shelf. This question has way to many variables to answer accurately.

2) How many shots do you get out of Black horn 209 (10 ounce bottle)?
Can't answer this. Never used it and probably never will. I get good results with BP and Pyrodex.
3) Who uses sandbags to sight in gun and how do you use them?
I use 5 sandbags and an adjustable front rest from Tipton. One bag on the rest and the other 4 near the butt. This gives me absolutely zero movement when I am locked into the rifle.
4) Do you shoot 200 yard targets regularly and effectively? Would you be confident taking a deer at that range with little wind?
I would never take a 200 yd shot because I have never practiced that far. I am sure my Knight could do it but I consider my MLs to be short range weapons. Not that they are not capable but it is just what I prefer. And I mostly hunt with sidelocks anyway and 100 yds is pretty far with iron sights and a ML.

5) Whats the best solvent for BH 209?

6) How fast can you load BP between shots hunting from a stand?
Again, this depends on the rifle and ammo being used. Normally though easily in under a minute. About 30 seconds or so with a speed loader. But then again, what's the rush. Your game is probably gone or about to be when they see you fiddling around. That's the fun of MLing. Make that first shot count.

7) What kind of rest do you use when taking long shots Hunting?