Bullet suggestions:
Conventional bullets either a North Fork or Swift in a 180 Grain bullet
Monometal: Barnes TSX in at least 165 Grain
Comments:
As you know eland are BIG. Hit them right and they die, poor shot placement you will be tracking one for many many hours. Many have been killed with .308s, 7 by 57s, 30-06s and other smaller rounds. My preference is at least a .338 with premium bullets.
Enjoy your hunt, August is almost here!