If you are buying factory ammo, go 35 Whelen, if you are reloading go 338-06 A-Square, I think that it's more efficient from a ballistic standpoint. If it were me, I'd probably go with the 9.3x62 if I wanted to keep the basic case size, or just download a 338 Winchester magnum.
Agreed - having carried a 338-06 out West multiple times - you’ll find .35 Whelen ammo on the shelf long before 338-06. You’re reloading, so probably less of a factor, unless the ammo is separated from the rifle at some point in your travels.
