Its about being realistic on whats "reliable" when it comes to off the shelf. AND how much you wanna spend. Nothing wrong with a double but most guys really are not functional shooting them, your cost for one thats wurth its salt is near abouts 15k plus.
An off the shelf Win 70 in 375 or 458 is nice but will require a bit of smith tuning to really get it right to be smooth and reliable...I'd put a good low power optic, re: 1-4X with good eye relief on it or a red dot! Another great choice is a big bore CZ, send it to AHR and do a level 1 overhaul. Have them put your optic's mount of choice on it also. Overall you will be into the game for about 5000$
You can get a Ruger if that suits you but good luck finding ammo in Africa if something goes wrong...a 375 or 458 can be found throughout Africa. My 2 cents, i've hunted the dark continent 7-8 times amongst other places...