22LR, 223, 243, 6.5CM, 6.5x55, 270Win, 7x57, 308, 30-06, 300WM, 8x57, 9.3x62, 375H&H, 416Rem, 458Win, 458Lott. 375Ruger is becoming ore popular with PH who don't hunt a lot of dangerous game. It is available in generally less expensive rifles than the 375H&H. Check out the prices on the Howa and the Mossberg Patriot.
For the travelling hunter, concerned about ammo availability, choose 30-06, 300WM, 375H&H. 416Rem, 458Lott becoming more popular for dangerous game.
I took my 300WSM in 2014 and am taking it again in April 2019. Handloads of course, Federal cases, CCI 250, enough RL17 to get the Barnes 168TTSX travelling 3100fps. A little small for an eland, but should work. Perfectly fine for waterbuck, nyala, duiker, fallow deer, bushbuck, possibly auodad or red lechwe.