Hello, Rocky.223. If your really interested in learning about smokeless powders..get the book Propellant Profiles by Wolfe Publishing..They usually have ads for their books in Handloader or Rifle magazines. This lists nearly all powders available, including black.
To learn about the IMR numbers, and their history..try and find a copy of Phill Sharpes Complete Guide To Handloading..Usually can be found at the better gun shows..This was written in 1949..some loads a bit dated..but the basics never change..a wealth of information.
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