Here is a link to read,down the bottom of the page you will be able to flick over to the .375 Mag aswell.

http://www.african-hunter.com/the_9_3_x_62_mauser.htm

I am going through the same thoughts now.
I rang a mate last night who has shot a lot of buffalo around Darwin 20 years ago.He liked the .375H&H(he had a Sako) He had use of a 9.3x74R in a double for a while.He found 20 years ago projectiles were a problem,lack of choice etc.
Those problems have been overcome now,so I'm leaning that way.
He said buff can take some stopping because of their thick skin.When heart shot thay will still run 150yds.
He always shot them in the head and that dropped them on the spot.
Once he shot 15 in a row with a 300WM one shot head shots and switched to body shots on the last one and put 18 rounds into it.HTH

Regards,Shaun.