What really hurts Whelen sales is that it is considered by many to be a medium range cartridge. When someone steps up above 30-06 then the 338WM provides the power and a reputation as a long range cartridge.

The 30-06 is like your high school sweetheart.
The 35 Whelen is a nice girl with a good personality.
The 338WM is sexy with the right curves.
and
The 9,3x62 has an exotic Safari mystique.