All of the single round ball load data did come from Speer.
I'm not sure where the double ball loads originated so please take them with a grain of salt, as you should.
3.2gr of Bullseye in 45colt from a 5 1/2" barrel is listed at 553fps.
I would expect see sooty cases from the blow around just as the ball starts out the case. Then it may not be much being the ball can't possibly seal the chamber or rifling.
Speer also listed data with various powders like:
In 44 Special, SR4756, SR7625, 231, 700X and Green Dot.
In 44 Magnum, HS5, SR4756, SR7625, 231, 700X and Green Dot.
In 45colt, SR4756, SR7625, 231, and 700X.