Just buy up every 8lb jug of WW-760 you can find.
Or BG, which I'm using where I may have used 760. I think it's cleaner and reportedly more temp stable.
Would like to see comparisons from those who have used both of those side by side in a round.
IME, it would be hard to beat BG in rounds like the '06, 7-08 and similar, although I agree that H-414/W-760 is pretty good.
DF
Edited to add, I agree with you on H-380 in the .338-06, although it's pretty close to Pw Pro 2000 LR and CFE-223, (some say those are very similar if not the same), also close to LVR, which is sorta a niche powder. I understand when something works, it's hard to go looking...
Those are all newer powders, may be cleaner, etc. Not sure but would suspect that to be the case. I haven't tried those in the .338-06. H-380 works.