Also note on the Hodgdon site you have to click on the Print button to see what case, primer, and barrel length they used to get the velocities they list.
I agree that replacing a manual seldom is justified except to get new cartridge data. In Hornady's case they will usually give you data on a particular bullet and chambering combination if you ask them, so you can keep your old manual up to date that way. I usually replace a book I use a lot about every third or fourth version.
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