Art Alphin in a book he co-authored "Any Shot You Want" has a chapter on penetration and his "penetration index". I highly recommend the book for many reasons. He also provides load data for many "hard to find" calibers like the 500 Jeffery, 375 Weatherby Magnum, etc ...

Here's a link.

http://www.grosswildjagd.de/penetr2.htm

It seems like a 350g solid out of a 375 H&H at 2350 fps or out of a 375 Weatherby Magnum at 2550 fps would be just the ticket ...

Chuck