OK, I"m heading to South Africa in August. I'll be hunting everything from Steenbuck to Eland. I plan on taking my Weatherby Ultralight in 7mm RM. My question, 140gr Barnes TTSX or 160gr Barnes TSX/Accubond? I'm partial to the 140gr TTSX but know those animals are tough, even the little guys. Thanks.
On my trip to Botswana last August, I killed 22 animals that started with the Steenbok and ranged to Eland and Giraffe. I am a huge fan of both the 7mm Rem Mag and the trusty old 30.06 and was intent on using my PH's 7Mag until I got there and began to handle his rifles. The custom '06 felt so good in my hands that I quickly chose it and never looked back. It's the caliber that I cut my large game hunting teeth on and I will always be loyal to it to a degree. Using Norma 180 grain Oryx factory ammo, I had great success on all animals hunted, electing to go for a head shot on the Giraffe. The Eland absorbed a couple of rounds before going down, but the first one was well placed and woulda been enough. I shoot 'em til they're on the ground though.
I believe that either of your choices of ammo in the 7mm RM will work if placed in the right spot, but the animals there are well constructed, although not indestructible. Heavier is always better IMO. Just make sure that you shoot a Blue Wildebeest very well, as they pretty much wake up and go for a run once shot! And even though one should always concentrate on making the first shot count, don't be guilty of standing there admiring your work... if the animal is still standing, shoot him til he ain't!