Have never hunted DG but if I were headed to Africa for that purpose it would be a custom 98 Mauser in .404 Jefferey. I'd spend a bunch of cash on cases and components and practice, practice, and practice some more.
“Some ideas are so stupid that only intellectuals believe them.” ― G. Orwell
"Why can't men kill big game with the same cartridges women and kids use?" _Eileen Clarke
"Unjust authority confers no obligation of obedience." - Alexander Hamilton