For a proper evaluation of the power level of the 9.3x62, try to avoid listening to folks who haven't any experience with it and are here to do nothing more than lie and troll. Damned shame, too...
Anyway, Norma lists the 9.3x62 pushing a 250 grain bullet at 2625, a 285 grain bullet at 2362-2428 fps, and a 325 grain bullet at 2300. They list the .375H&H pushing a 270 grain bullet at 2625, and a 300 at 2493-2559 fps.
As Phil Shoemaker (who has more first-hand experience with either the 9.3x62 or the .375H&H on LARGE critters than probably anyone else alive) puts it when comparing the two (9.3x62 vs .375H&H):
The main difference that anyone is likely to see between the 9.3x62 and the .375 H&H is the difference in the depth of the rifling lands, ( the bore size of the .375 is .366 or 9.3mm), 15 grains of bullet weight and, depending on the load, maybe 100 fps of velocity. None of them are enough that any animal is likely to notice.
