I shoot a 9.3x62 which seems to have the advantage because it was once an '06, so it carries like one, but hits stuff like the .375 that weighs about 3 pounds more and has been retired from hunting since the 9.3 arrived. I have yet to see a .308 180 or 220 grain partition act like a 286 grain 9.3 partition. Yet strangely the 286 grain 9.3 does the exact same job the 300 grain .375 partition does. At least on the deer, mountain goats, and brown bears around here.
I think that you've made a good argument for the 9.3x62 over the 375 H&H.
My 375 is a post-'64 Model 70 that is a little longer and heavier than I'd prefer to carry very far, but whenever I fire it, I appreciate the extra weight. OTOH, my 9.3x62 is a mannlicher stocked carbine that is light, handier, much more pleasant to carry, and not at all unpleasant to shoot. The 286 grain Partition seems like a winner for thin-skinned game and Nosler's 286 grain solid might be equally good for thick-skinned game, but I've never loaded or shot any of them, so I don't know that they are.
