This is also a topic that is discussed without coming to a conclusion.

In many countries of the former British Empire the cartridge 375 H&H Magnum has been set as the legal minimum for hunting Big Game. The cartridge 9,3x62 was certainly known, but perhaps it was considered a little bit borderline for the purpose. The cartridge 9,3x64 may not have been as popular at the time, but it is comparable to the cartridge 375 H&H Magnum.

But you have to set limits somewhere. If you always tolerate something below, you get to extremes that are no longer tolerable. It is ultimately about the game and not the well-being of the hunter. Who is not recoil proof should hunt something other than Big Game.