What I would do is decide on a bullet, for me it is just range fun ammo, so cheap 55gr fmj. Start looking at powders listed in the manual that are listed under that bullet weight. You are looking for a powder that is "happiest" with that weight. Sounds weird maybe, but if you see a powder that is listed in weights of 40, 45, 50, 55, and not 60gr, you know that powder might be at the faster range for 55 and it will work, but not might give great results.
There are so many to choose from, that it usually comes down to what is on sale/available to you, and if you like an easy auto-metering ball powder, or are a one at a time loader and don't mind stick powder. (some stick powders don't do as well in press operated auto powder measures. but if you are a weigh it and dump it into a funnel guy then it doesn't matter)