I have a bit of practical field experience with the 9.3x57, 9.3x62 and a little with the 375hh. I got most of my experience culling nusance bears, around 45 and hunting maybe 20 deer and 7 moose. about 50% with the 9.3x57, 30% with the 9.3x62 and the rest with the 375hh.

In my limited experience the 9.3x57 and 9.3x62 both penetrate bettter then the 375hh. All with hornady and speer 286gr .366 and 300gr .375 bullets. The 375hh does seem to make them stand up and then fall over better then the 9.3's.

This is subjective and a matter of opinion but I stopped using the 9.3's to follow wounded bears after I had one come pretty close to using my leg as a chew toy. The 375hh seems to stop charges better, maybe not drop them in there tracks 100% of the time, but turns them with authority.

Bullet placement is king, but I like the slightly larger margin of error that the 375hh allows.