I have shot a lot of game with the 9.3x62 and a few head with the 9.3x64..I prefer the 9.3x62 with a 26 inch barrel as I get that needed extra velocity with the 300 gr. Swift and the 320 gr. Woodligh with a big dose of RL-15 powder..I get an easy 2400 with the 320 gr Woodleigh, that is 100 FPS slower than my 300 gr. hunting load for my 375 H&H, but its also 20 grs more bullet so thats a push I guess......
My 9.3x62 holds two more rounds than my .375 H&H; it weighs 9 lbs scoped and about 8.5 plus with irons..It is a Brno Mod 21 (not original) but you couldn't tell by looking...It is easy and ultra handy to carry, points like a Boss 20 ga. shotgun..
I have killed much plainsgame, Cape Buffalo, Bison, deer, elk as best I recall and it is a real hum dinger..Better than my .375, probably not, but whos counting, and with equal shot placement seems to do just as well....
I would say that you have made an excellent choice for an all around big game rifle and I would not hesitate to hunt elephant with it with a GS Customs flat point solid...