Winchester 231 and Hodgdon HP-38 are the most popular, and some would say, the most universal pistol powder for lighter to mid-range bullets. Most reloaders agree they are the same powder under different labels. Loads for 1 of these powders appears in every reloading manual, so it is also easy to find load data. Or you can simply go to the on-line Hodgdon site.
It works well with any kind of bullet (lead, plated, jacketed) and it meters very good. And it is easy to find.