I would not spend the $30 on Load Data, you'll get enough information from the manuals and other reloaders to keep you busy.
Two different manuals sometimes show different load data for the same bullet weight due to several reasons : bullet length, tail shape, plating thickness, and make of bullet, and perhaps the maker of the brass that was used. As a rule of thumb, use the lower of the two unless you have the exact bullet referenced in the hotter manual, i.e., the Sierra 150-grain boat-tailed hollowpoint in the Sierra Manual.
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