To warm up for your buffalo hunt, use your buffalo gun to get used to shooting/handling it in field conditions and get close (under 100 yards) to the game, preferably in dense brush. Eland is a very good choice because they are big and can be a real challenge to stalk within "buffalo range". Black wildebeast on the other hand are open plains animals. Hunting them, at least in my experience, is like hunting pronghorns and not anything like hunting buffalo. Even though you've taken one already, a better choice is blue wildebeast (AKA "the poor man's buffalo") because their preferred habitat is the same as a buffalo. If you don't want to take another blue wildebeast then waterbuck, kudu, impala or zebra are better choices because of the habitat in which they are usually found.
