You are right; I never understood J. Lott, who had a world of experience with double rifles, loading huge cases with fast burning powders and fillers.(same goes for Keith, Seyfried..) It is so simple loading 'normal' nitro cases with slow powders. I load my 450NE with H4831 (slower than its Dupont variant). Start at
93 grains; work up a little to regulate.
Greetings,
Livinus