The 9,3x64 is a great cartridge like the 375 H&H . I have no experience with the 375 , but i shot a lot of game , mostly deers and wild boars , with the 9,3x64 . There is a big difference in the field with regard to the indicated ballistic . It is a powerfull cartridge , no question , but a relatively small cartridge and thereby limited performance . These are dependent of the rifle and especially the barrel that you use , as with other cartridges , that's right ! It surpass the 375H&H ? I don't know !