RE: Powder for 308, 30-06 and 300 WM
I have loaded 47gr.of IMR-3031 for my 30/06 for years. It gives me 2763fps. Most important, with a good rest, I can shoot 1/2" groups (or less) constanty.
I use the 150gr. Hornady spbt bullet. In addition, it is pleasant to shoot,(lower recoil than other loads) and I can shoot very accurately out to 300yds.(longest range I have been abe to test it, so far). AND, it kills deer.
I can't imagine why I'd want to shoot 57gr. of some other powder just to get another couple of hundred fps. at the cost of accuracy due to additional recoil.