Probably the highest velocity possible in 308 with 168 gr bullets will be with H335.
But lately for long range hunting at various temperatures, I have given up on anything but the temp stable powders like; AR Super comp, H4895, H4350 etc.
The word 'forum" does not mean "not criticizing books."
"Ad hominem fallacy" is not the same as point by point criticism of books. If you bought the book, and believe it all, it may FEEL like an ad hominem attack, but you might strive to accept other points of view may exist.
Are we a nation of competing ideas, or a nation of forced conformity of thought?