Only because I've read this so many times and disagree with the comments that an OP needs to spend big bucks on a firearm for Africa.
The OP is kind of hinting he's on a tight budget and most likely sell the rifle after his hunt.
Yeah, okay, we all know once bitten there's always going back....even if it's several years, or a couple, 3, 4, decades later.
Then there's the horror stories of the airlines possibly loosing, or miss including your rifle on your flight.
My African rifles are cheap by some folks standards. But these guns are reliable and accurate. Most of all if for whatever reason something was to happen to them I'm not out 5, 10, 50+, 100+ thousand dollars for:
1) a rifle that the insurance company will only pay pennies on the dollar.
2) an expensive rifle that shoots and feels no better than my less expensive rifle.
3) that expensive rifle definitely looks prettier. To pretty to get marked, scratched up.
I like the R8 concept like the T/C Contender and Encores. I just don't
care for the style of the R8 bolt action.
As for double barrels I much prefer the traditional SxS, but I won't pass up an O/U. Then there's the quicker follow up shot, if needed. The bad; finickiness for regulation, accuracy, and reduction in range compared to the same caliber in a bolt action, lever action, pump, or single shot, I just can't justify the expense, when I can buy 3, 4, or more rifles, sufficient ammunition for each and have money left over for a safari or 3.
When it comes to optics and ammo: there should be no skimping! I'd rather take one less animal and fly economy class than skimp on optics and better ammo.
As for affording a buff hunt. Well there are sponsors here on AH and outfitters not here on AH that offer cull buff hunts for at or less than the price of economy class airfare and quality trophy buff hunts at or under $10,000USD.
I for one can say I've never had an animal I've killed complain about the brand and price of the firearm I shot them killed them with.