I’ve been present for three eland hunts. One was my own with a .300 Wby Mag 180 TTSX. It was a one-shot deal with a dead bull inside of 10 yards. The bullet was recovered tenting the skin on the far side, perfectly expanded.
The second eland was shot with a .340 Wby and was recovered the next day after a long tracking job and two or three additional shots. The shooting on that particular occasion wasn’t very good.
The third was shot with a .308 Win using mediocre bullets and dropped inside of 20 yards.
So, put the bullet where it goes, and the 7mm will be just spectacular, especially with good bullets.
All of that said……. for me, ideal is in the .338 range. .375 is not too big. .300 magnums aren’t too small. 7mm isn’t too small, but make a good shot.
Eland hunting can be very, very fun.