Get the Lyman Cast Bullet manual.
Green Dot is hard to find as that is almost only a shotgun powder--not that it isn't a great powder for pistols, just that the companies don't cover it and you'll need to look for old data. The Lyman manual does have Green Dot data.
75gn cast bullet:
Green Dot: 1.6-24gn
231/HP38: 1.5-2.5gn
TG: 1.8-2.0gn (thus, I wouldn't use TG for this, though I wouldn't use TG for almost anything).
85gn lead bullet:
Green Dot: 1.6-2,3gb