Krakow Kid,
It sure did,all you have to do is read the exploits of the old time hunters and their Askaris?.Read especially about the old poachers that used natives in addition to shooting themselves.Also pay attention to the slave traders that captured or bought slaves and used them to carry the tusks from elephants killed by natives.Pay attention to the Boers,as well as Brits that started out poor and shot what they could find.To find this,forget about tales of safaris by rich folks in the 50s&60s.
What they had was a rifle that would shoot fixed ammo that they could buy cheap or steal;when before,they had to shoot some old ML.You are comparing the 577 with modern magnums, while they compared it with an old ML that may or may not shoot when things got "sticky". Also a leopard is in the Big 5 and it's not so big.Read everything you can find.
Mike