I have the Sierra, Speer, Lyman, Hodgdon, Hornady, plus NRA books, and Cartridges of the World which also has load data in it plus years of notes. I guess if I had to use just one it would be Horandy ............... but its a close race.
I find I use it the most and the Hodgdon is right behind it.
For techinal questions I usually refer to Modern Handloading by Nonte.
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