I was there for 33 years so used various scopes. All were Leupold. My 375 H&H was a Vari X III 1.5-5. My various 338's 2-7, 3-9, 2.5-8, and 3.5-10. 30-06 was 3-9, 2.5-8. I tended to set my scopes on the lowest power and virtually never had to adjust. Even when I was in So. Africa last year 2.5-8. To me the most important thing was that it was a nice clear picture.
