Well, since you asked so nicely , the only big game that I've hunted in the past is whitetail deer.Welcome aboard jpr9954. Please tell us a little more about yourself as a hunter. Things like what have you hunted in the past, what kind and caliber rifles you own, do you reload. What are you thinking about hunting in Africa? Are you thinking about going by yourself or with friends and or family?
Jpr9954, we have a number of things in common. First off being my favorite the 6.5 x 55 Swedish Mauser, and a 308 Norma Mag. I too have a number of WW I rifles Springfield(s) and Enfield(s.) Hunting Africa is an absolute "blast." I took both of my sons on my first trip which was a retirement gift to myself. After joining AH I quickly realized that I "needed" bigger and bigger rifles. I'm all but positive it will be the same for you. We have differences of opinion expressed on AH but remember that it must be done without castigating the individual. Mutual respect is the order of the day. Bantering over the efficacy of one caliber vs another or your favorite vs someone else's has been fair game. It is a blonds vs brunettes thing.
Just for giggles, have you ever taken a good look at the ballistics for a properly loaded 35 Whelen? They are awesome.
I took a 35 Whelen and a 6.5 x 55 Swedish Mauser on my first trip and a 404 Jeffery and my 35 Whelen for the second.