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On the several book I own I have seen these differences as well moreso between Hornady and Lyman and Lee on some the larger charges reflects the longer COAL, as you see that sometime the pressure listed is changed as well on the longer ones yes again some older books seem to favor more powerful load data than today Lawyered down versions, but again books printed within the last 10 yrs take into account the modern powders this is not to say I won't use high end load data from the older data books as I choose to use full load vs watered down loads be sure to watch the COAL's and you'll be safe have some fun designing you most useful for your general desires.
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