Early on I had two rifles in 338 Win, one had a 2x7 and the other a 2.5x8, both Leupold's.
As I got older the realization came to me that these rifles and others used fro hunting were always set at 6X as a default setting. Most all game was taken at 6X.
The 338's are long gone and now use a 9.3 for heavy game and a 30-06 for hunting everything else. Both wear a 6x42 with M1 and CDS dials installed.
These are rugged and reliable with a very generous eye box which negates some of the magnification at close range and 6X is good to at least 600 yards.