Tom, here is what I do when deciding how to load up a new rifle or load. I take several sources, usually Hodgdon first, along with IMR, and Alliant, and then take take loads out of Nosler, Sierra, Speer, and lymans, (barnes if it solid shank bullet), and write them down, and look at the data all together. Some of it has to do with powder on hand. All of these manuals are just basic guides.

You probably figured alot of this out already. Lymans is kinda good where it mix's the bullets up, and you get to see another persons experience with another rifle, and compare data with the bullet manfactures data to help you better make a decision on starting load andwhere to start being real careful.