Toying with shooting blackpowder loads out of my SAA. Does anyone do it?

The table I'm using from Hodgdon states:

[align=left]45 Colt 200 Gr. Cast LRNFP Triple Seven FFG 35.0 Gr. 959 8,500 CUP
45 Colt 250 Gr. Cast LRNFP Triple Seven FFG 30.0 Gr. 838 9,500 CUP

That is actually faster than the smokeless will push those particular bullets according to another table from "IMR's Trailboss" smokless powder:
[/align][align=left]Bullet: 200 GR. Cast LRNFP[/align]
[align=left]Dia. .452"[/align]
[align=left]COL: 1.600" Trail Boss 5.5 706 8,000PSI [/align][align=left] 6.5 855 11,000 PSI[/align]
[align=left]Bullet: 250 GR. Cast LRNFP[/align]
[align=left]Dia. .452"[/align]
[align=left]COL: 1.600" Trail Boss 4.5 606 8,800 PSI[/align][align=left] 5.8 727 12,700 PSI[/align]
Can someone please tell me why I have been using a slower powder, when I could be smoking out everyone at the range?

And what am I going to do with the 3lbs of Trailboss I have left?
Guess I have to get more pistols and use it up.

I'd be interested in recipes and experiences with BP cartridge reloading and shooting.