Hey Mod,
Like many of the others, the Lyman manual would be my first, then Hornady, followed closely by Speer. While I do not have the newest editions of these manuals, I do have all the Lyman manuals going back to 42nd or 43rd, and about four editions of the Hornady and Speer manuals.
I also have a whole bunch of other loading manuals, but my first choice would be the Lyman, and that is what I would recommend any new reloader to get for a "first" manual. Several editions of my early Lyman manuals included shotshell data as well as metallic. Now I also have three manuals dedicated to shotshells.
Best wishes,
Dave Wile