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Message: <blockquote data-quote="Blitzfike" data-source="post: 2783062" data-attributes="member: 807"><p>Depending on how old the manuals are, powder changes over a decade or two. I'm talking about the formulation from the manufacturer. A batch of unique from 1970 may well have an appreciably different burning rate than the current production. Manuals reflect those changes and in some cases they have dumbed down the load on instruction from the legal department. A chronograph is a very important tool in working up loads, it lets you approximate the load velocities listed in place of measuring pressure. If someone ever brings out an affordable pressure barrel system for the reloader then the game will be on for sure.</p></blockquote><p></p>