If you have multiple barrels, you will find that there are 1 or 2 calibers in one manual, and a few more in another, Speer has got quite a few in their book, but not nearly enough. I have found the Loadbooks to be the final authority and the most valuable book existing for the Contender. I also compare loads in other books, but alas...Speer only has Speer bullets..My Accurate Reloading book goes right down the line with their own powders...#2, #5, #7, #9.....many powders of which I do not use ..Hodgdon's new Annual Manual is a must have, but once again ...very limited to chamberings and guess what?...they only have Hodgdon powders. Who would-a thunk it? Now on the other hand, my new loadbook has Thirty-six calibers, and it isnt just a reprint from the last book, it is updated....For instance...my old Contender Loadbooks changed some of the 7TCU data that I tried and I considered to be too hot. They ended up with very close to the load that I ended up with.
GET THE BOOK. It is cheap, and you will use it over and over again. Get some of the other books too. The more sources you have for load data, the better off you will be. There is no such thing as too much information when it comes to re-loading.