Any of what I"ve seen would be plenty IMO. I don't have a lot of experience with eland but my buddy just took an old Cape eland in South Africa with my 28 Nosler and 160AB. He shot him at 250 yds quartering away and the bullet was found on the exit side just under the hide.
I had a similar experience at about 200 yds, broadside in RSA with my eland. However, the LD eland tends to offer fleeting shots as they disappear into the bush. Many shots will require significant penetration and tracking is best avoided. YMMV
