Anotheer movie located in Africa where the protaglnists are both using Springfields is "The Macomber Affair", with Gregory Peck and Robert Preston as PH and client. Both blaze away at running buffalo, and typically take the rifle down from their shoulder after each shot to work the action.

If you look carefully, the hunting car has a sign on the side with the fictional PH's name and "Box 1822, Nairobi". That was the address of Ker & Downy (later Ker, Downey & Selby) Safaris, who provided the support for the film crew. It was Ker & Downey's first of many such projects.