What I find amazing in these kinds of discussions is people arguing for calibers at the margin of minimum required for a particular game. Which necessarily does not mean what is advisable, unless the shots are perfect. Firearms are cheap compared to the cost of a Safari. Why not just use enough gun? Most people plan the Safaris a year or so in advance, plenty of time to get familiar and comfortable enough with a newly acquired firearm. Not to mention it is a good excuse to expand the battery.