As far as momo-bullets, I feel that Barnes set the bar - about at the top and others may or may not be as good = the bar is set.

For an '06 - for plains game, of course, I think the 165gr. TTSX would be the ones I'd use - around the 2,900fps. They work splendidly for moose and elk here, right to the far side of 400yards - if you have the skill.
Trajectory over there, should be of NO concern. I would use Partitions only if I could not get Barnes TSX or TTSX and that would probably mean 180's.

Never been to Africa - probably never go, I haven't hunted all NA has to offer - yet- thus, my opinion on what I would use.