The 9.3x72R Sauer & Son is an entirely different class of cartridge with a head diameter close to 30-06 whereas the 9.3x72 R norm. (The one under discussion) is close to 30-30. The 9.3x72R Sauer & son is in the same class as (albeit with a lighter bullet) the 9.3x74R and is sometimes confused with it. There are no less than 3 different versions of the smaller 9.3x72R, differing mostly in case shape and all may be found with different groove diameters from .352 to .368". Luckly they all were proofed to the same pressure.
Mike