Re: Sierra reloading manual
The added pages caused by the inclusion of the drop tables were becoming an issue as the manuals increased in thickness/content. Hornady did something along these same lines, in that they came out with two books, one with relading data and the other nothing but drop tables. As I recall, I think they only sold them as a set; buy the reload data and you got the drop table book as well.
With the plethora of computer programs out there these days, many of them available on line for free, it just wasn't seen as being as needed as it was a few years back.