Get a reloading manual and look up burn rate chart or just google it. Imr-4350 is normally a go to powder for most any weight of bullet but also keep in mind if you shoot anything less than 70 gr. bullet you may find little better groups with a faster powder. I choose powders that give me highest vel. and best accuracy. Not all barrels are the same, so you just have to go try a few powders up or down from 4350 and trying to copy another guy's load info is just a waste of time and bullets.
