Don Heath said of it:
"Loaded with good bulles, the 9.3 delivers the same terminal performance as a .375, and does so without the sharper recoil, longer action, and greater weight of its modern replacement."
He felt that heavier rifles than the 9.3 could not achieve much it could not until you got up to the 500 Jeffery. So as far as a comparison to the Whelen, the 9.3 would seem to be in a different class, yet still designed to be an everyman rifle for the African homestead. And unlike the Whelen, they are plentiful at very low price points.
Very high praise for the 9.3, but for most of us hunting here in NA, I doubt one would see a big difference between the 9.3x62 and the 35Whelen.