Once past 300, wind will be far more of a problem than any difference among the three cartridges. And the .270 will drift, if not quite as much as the others. Not enough advantage in drift or trajectory to really mean much. Further, having loaded for a .270, I'm a bit dubious about the velocity shown above if it's from a rifle with a barrel of less than 24".
A 7mm08 is a .308 with ten grains less bullet. The practical difference is underwhelming, IMO.
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