OK, let's put it this way: if there were a European 9mm magnum they would load it as I said above. The 9.3x62 does not equal the 375 H&H, quite, but due to it's use of heavier sectional density slugs than the 375's, it came within spitting distance in effectiveness on african game. As for the 35 Whelan vs. 350 Rem Mag., Jeff Cooper's "Lion Scout" rifle used the 350 case with a longer action and throated to seat heavy bullets even with the bottom of the neck. He referred to it as the 360 Fat Fireplug. Unfortunately factory loads are sub-optimal for both the Whelan and Rem Mag. I remember a 7mm Sharpe and Hart previous to the 280 Remington and 7mm Rem mag. Back in the days when your choice of 7mm was limited to the 7x57, the 7mm Weatherby and one european cartridge quite close to the later 280.