I am with
Red Leg on this one...
The .470 will feed the dream. That is what my first double, a Belgian Jules Burry in .450 #2 did. I resold it 20 years later, after finally burying Denys Finch Hatton and realizing that I would never "have a farm in Africa" (Karen von Blixen-Finecke), and before I ever went to Africa... But I LOVED the countless evenings I read Patterson, Bell, Hemingway, Taylor, Ruark, Capstick, Harland, Hunter, Percival, Nyschens, Holmberg, Kinloch, Henley, Manners, et al. with it within grasp on the gun rack...
Then life (i.e. getting the 5 kids through college and out of the house) made it possible to go to Africa. I immediately bought my second double, a Krieghoff .470. I hunted Buffalo, Elephant, and Lion with it. I DID shoot one Buffalo with it, but subsequent Buffalo, and Elephant, and Lion, I hunted - i.e. carried for days on - with the .470, but I shot with my backup (on the shoulder of a tracker) scoped Blaser R8 with .375 H&H or .458 Lott barrels.
I have now sold my .470 K Gun because I shoot the R8 thousands of times more than I could EVER shoot the .470 (I have both .223 Rem and .22 LR practice R8 barrels in addition to .458 Lott, .375 H&H, .300 Wby, .257 Wby R8 barrels) and my muscle memory is with the R8.
I will go
Red Leg on more step, which I suspect he will back me on: I suggest,
Roland Tembo, that you buy a Blaser R8 in 9.3x62. You can then add later whatever you want/need. Will you go after Camoscio (Chamois) in the Alps or Dolomites? .270 or .257 Wby barrel! Will you go after Kudu in the Karoo? .300 Win or Wby barrel! Will you go after Elephant in the Chewore? .416 Rem or .458 Lott barrel! Will you need one rifle to do it all on Buffalo and PG in the Moyowosi? .375 H&H barrel! Will you go on a Wildschwein (Wild Boar) drive in the Black Forest? 9.3x62 barrel! Do you need to train your shooting skills? In a city shooting gallery? .22 LR barrel! At a shooting range? .223 Rem or .222 Rem barrel!
When everything is said and done, yes the double will give you a slightly faster second shot, but the R8 will give a light-year faster third and fourth shot... not to mention the ideal caliber for nearly anything you may want to hunt anywhere...
Many of us have filled entire racks and even rooms with rifles, often prestigious and mythical, and end up only grabbing for the R8 when we actually go hunting seriously...