It depends on what powder you want to use. What gun are you shooting? What length barrel? Using the 200 grain #68, you only have to go 825fps, plus a little to be sure you'll make chrono. I'm pretty fond of Hogdon Clays, as it is very clean burning. Overall length, and crimp will also affect velocity. Lots of people like 231, bullseye, 700X, Accurate#2. A little slower, not quite as clean, but lower pressure at the same velocity are Unversal Clays , titegroup, Unique, accurate#5. In .45acp, there's a lot of possibilities.....
Buy a loading manual. If you are shooting a 1911, remember to have enough crimp the bullet does not push back into the cases when it hits the ramp. Overall length is also important for reliable feeding.
Did I mention - buy a loading manual???
Some guy named Ken Waters has done a bunch of load development, and his manual has long been one of my favorites....
all the best,
Mike
