I can't comment on the Whelen since I have never done any extensive work with it but the similar .338/06 I have done quite a bit with. I never noticed any substantial differences with the 180 and 200 grain bullets velocity wise but the .30/06 had a little better trajectory and I suspect real world penetration would be better. IMHO the only real advantage in the Whelen or .338/06 either one is with the heavier bullets, up to 200 grains the .30/06 will work as well realistically speaking.
Bob
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