beneath the surface, the intricacies of powder are a mystery to me... but I'll tell you what I do... I go to the powder manufacturer websites and list every powder I can use for each cartridge and bullet I plan to use. that way, when I go to the store, I can look at their meager selection and hopefully (yeah right) find something I can use. if there are any overlap powders I can use for multiple cartridges, they get a hash mark so I remember.
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