I look thru as many books as possible, and check the reputable online sources that show that weight/style of bullet, in all the common brands. They will usually show a standard group of powders for that cartridge. Ie; you may see the 7mag size cartridges showing powders in the IMR 4350 range up to H1000, which is quite a range of powders, but, usually, only 3 or 4 of them will show consistently across all the different sources, producing the upper portion of the velocity ranges listed for that weight of bullet.
I have found those are the ones to try first, usually. The 7 mag usually likes the slower side of things, the stuff in the H4350 to RE22 zone, which is the slower of the 4350 range to the slowest of the 4831 range. Sometimes it likes slower yet, into the 7828 and H1000, some of that is about bullet weight though.
That gives you a lot of choices, but, with some research, you can narrow that down quite a ways, then see what you can come with for availability.
Read up on it, write it down, you will see a pattern emerge.
Hornady, Sierra and Speer do not put out a lot of online data on their sites, they have some new bullet release data, but not a whole bunch.You can use the Hodgdon, Western, Accurate, Alliant, Norma, VV sites to get the most up to date powder info, Nosler, Barnes, CEB, have a good bit of data on theirs.
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