Obewan - will you be handloading the .375 H&H?
I've found it real easy to load, and surprisingly easy to shoot well.
Using the 260 gr Nosler Accubond on bear, via RL-15.
The 300 gr bullets seem to work real well with H4350.
I borrowed my load data from gunwriter John Barsness. Made for real easy load development.
And yes, that 1.5-5x Leupold is a good match for the rifle!
Guy