Well now, as one who stares at these long mathematical comparisons on a daily basis let me digress just for a moment.
Irrespective of the valid and valuable presentation of the initiating author, when the smoke finally clears ( no pun intended but still acknowledged) I believe we are left with something of a subjective decision to make.
While charts and graphs can be, in fact, most impressive and if you are in the sales game, a most useful tool, life often boils down to this singular query:
What has worked, or for that matter proven effective, in the past?
In that I offer as follows:
.275 Rigby 1892
.30/06 Springfield 1906
Medium (can go both ways)
.375 Holland 1912
9.3 x 62 mm 1906
.416 Rigby 1911
450/400 N.E. 1896
.470 N.E. 1900
My subjective assumption then is essentially this:
While there have been many many improvements in firearms the fact that these cartridges have (a) proven to be exceptional performers for over 100 years, and (b) many rifles, of all grades, are still chambered for them, and (c) the ammunition is still readily available for all, and (d) and these are, by far and away, the principal calibers used to engage game in Southern Africa, seem to indicate to me that, if we refuse to allow ourselves to be caught up in the latest "whizz-bang" trend, the selection for Africa is pretty academic.
Pick one from each column and go.
And now, that this has been said, it must amaze some how we continue to discuss something that has already been decided.
[I will now move to a comfortable chair and await the bombs to start falling .... and laughing all the while!]
I am willing to bet you will not be using anything approaching the bullets and powders available from 1892 - 1912 in those cartridges.
So while I agree 100% with your basic premise (I like to say "never hunt with a cartridge younger than you"), we must be intellectually honest and admit that our old favorites (mine are the H&H brothers) benefit from modern powders, primers and bullets.
If I had to use Cordite in my 300 H&H, I might as well just shoot a 30-06!
edit: wow, old thread!