I started out with the "generic" type powders. Then after a few hundred rounds, and much asking and research, here in the caliber specific reloading forum as well as reloading manuals, started to develop a load to suit my needs. It's still a work in progress, and since I shoot Production, learned that my pistol works better with a lighter recoil spring with minor PF loads. There is extremely good information here, but cross reference everything with a published manual. A typo by someone concerning OAL can lead to big problems. I'll be quick to add I've seen that sort of thing fixed pretty quickly, though. As a final thought, make sure while reading in the forum, the load data your about to steal is being used in a similar way you wish to use it. For instance, a .40 loaded long to make major in an open gun isn't suitable for my XDm.
Ask, ant you will learn!
B