Thanks all.
I have an older Barnes manual, but I tend to pull load data off their website since it is the most current. They reference VIT N540, H4895 and RL15 for the .375 H&H.
I'm not particularly fond of RL15 as I've tended to see alarmingly flattened primers right out of the gate at lower load densities with other rifles/cartridges. Not that I wouldn't try it if there was a consensus among .375 shooters.
Now, H4350 has been one of my go-to powders, particularly in 300WSM, and one I keep a fair amount of on hand. That's one I'll definitely have to give a closer look.
Thank again,
Allen