WHY would one choose a 338 Fed, or 358 Win, OR 338-08 or 35 Whelen,
OVER a 308 or 30-06?
OK, you could say "larger cal." but it's not that much, especially in 338, and you could say, "heavier bullet" but you very likely won't be shooting 250 grain bullets, and you can shoot 220s in the 30-06 and have better Sectional Density.
Say, you can get more velocity with the larger base of the bullet, but Well, the bullet is SHORTER, (LESS SD)
In such a case or cases, Why bother? Do you see a real advantage with the larger 33 or 35 cal.?
Smitty of the North