.... I'm not sure there is a "Best Reloading Manual". That being said, RCBS, Lyman and Hornady seem to be the ones I personally use the most often. Keep your eyes open for Older Manuals, often they have loads that don't appear in Newer versions, and obviously, "Obsolete Rounds. .... The Major Powder manufacturer's offer "Free Load Data" in Pamphlet Form, and that's useful. The Internet, can provide data as well, BUT be careful about sources ! ..... David K