The 9.3X62mm was designed for use in the German African colonies, Tanganyika and German SW Africa, now Tanzania and Namibia. After WW I, the former became a British colony and the latter was administered by South Africa. However, German is still spoken widely in Namibia.
As far as I know, the round was intended for use in '98 actions, and I don't know of any earlier std. factory rifles ever chambered for 9.3X62mm. Same for the more potent 9.3X64mm. I wouldn't chamber older rifles for either load.
Frank C. Barnes', Cartridges of the World is the std. reference for matters like this. But John Taylor in, African Rifles and Cartridges also spoke very well of the 9.3X62mm. Bear in mind that most colonists, German or British, were using iron sights and shooting within 200 yards.
I think Taylor's comments on the .303 were about the old MK VI load and the softpoint equivalent. Its 215 grain bullet wouldn't shoot as flat as the later MK VII load with 174-180 grain sporting versions. Otherwise, I think everything Taylor wrote there was in agreement with what other hunters in Africa said.
Maybe ten years ago, Peter Hjortberger, president of Fallkniven Knives in Sweden told me that he used a 6.5X55mm rifle on moose, but that brown bears were moving into his hunting grounds and he'd added a 9.3X62mm in case he might have to shoot an aggressive bear.
Another Swede I know on the Net told me today that where she lives, further south, she isn't worried about most animals, and roe deer get into her garden. But she's wary of wild boar. Many like the 9.3mm ctgs. for those.
One major issue with using it in the USA is that your dealer (not Wal-Mart) will probably have to locate and order the ammo. Or, you can order, if you find a retail source. But it's not going to be routinely available here.
