RE: .300 Rem SAUM
I don't have this cartridge, but you will have to start out just like anything else.
First get the bullet you WANT. What will you be hunting? Deer and antelope only require a 150 grain bullet, such as the Hornady SP, Sierra Pro Hunter, and the like. Elk will require something a little bigger in the 165-180 grain range of Nosler Partion, Barnes TSX, etc.
Now that you have the animal figured out that you want to hunt, and the bullet picked out, go to the book, and find the 2 or 3 powders with the highest velocities that you can readily attain. Get a pound of each, and only one type of primer (as is stated in the manual).
Lastly, its all "working up a load." Start with theminimums and work up to the max in 1/2 or 1 grain incriments. (I usually go in 1 grain incriments until real close to max with cartridges that have better than 50 grains powder).
Go through each powder, top to bottom, and pick the one that shoots the best. Load 20 more, wait a week or more, or different weather conditions, and shoot again, and make sure the load is consistent from time to time. If not, start over with something else.
This may not be the info you are looking for, but unforunately there is no other way to do this then putting down the legwork yourself.
Later,
Marcial