777
777 is a Black Powder substitute made by Hogdgon. Depending on who you "talk" to here it is great, ok, or a sign that you are truly evil. I bought it because when I bought my 1858 it was the only FFFg powder they had in stock at Cabela's. They only carry substitutes, none of the "true" BPs. (Goex, Swiss)
It has worked fine for me, I don't seem to have an inordinate amount of fouling in the barrel (although I have nothing to compare it to), and cleans up without what I consider not to be too much hassle. I'd like to try some "holy" black at some point, but by my calculations at 15 gr/shot my 1 lb of 777 will yield about 466 shots. I think I have about 400 left to go.
It is my understanding, from this forum, that you don't want an air space between the powder and the ball. Because of the nature of BP it will cause excessive pressures, which I personally would like to avoid. So, because the ram on my 1858 won't reach down into the chamber far enough to compress the ball on top of a 15gr powder load, I use the filler. Also use a lubed wad on top of the powder as many here have recommended to seal the chamber and provide cleaning and softening of the fouling that does occur with each shot. I also put bore butter on top of the ball to provide additional sealing and cleanability.
Also, I think someone here talked about keeping the ball near the top of the chamber to increase accuracy. I think the theory was that if you had less distance to the forcing cone, which guides the ball into the cylinder, it was better. My untested and unscientific thought on this is that it is probably more relevant when you are shooting balls with a sprue button on them. Even though you may center the button when you put the ball in the chamber, if it twists and the button engages the rifling you have an out-of-balance ball exiting the muzzle and is probably a flier. Of course I'm sure most of my fliers are caused by my inability to see the target clearly, or my inability to hold the darn thing steady, or my inability...
Sorry to be so long winded but this stuff really is infectious. I'm thinking of starting CAS so I can, hopefully, talk my wife into a couple of Ruger Old Armys. Of course while I'm at it I might as well get a couple of Vaqueros because then I could shoot in a total of three classes when I load the Vaqueros with either BP or smokeless cartridges.