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Actually, the 280 has identical muzzle energy as the 270 except it drops 2 more inches at 500 yards.
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As much as I love the .270 I have to disagree if we're talking hand loaded ammo. Factory ammo, yes, the .280 rem has about the same ME as the .270 win, but it seems like a majority of factory .280 rem ammo is loaded fairly mild.
Generally, with the 06' cases the larger the diameter bullet the neck is sized for, the more potential ME you are capable of safely achieving, up to about .35caliber, where it begins to fall off in potential. The sweet spot for the 06' case seems to be between .277 and .338 for the most efficient loads.
Even so, hand loaded, the .270 versus the .280, the differences in ME is fairly negligible, we're only talking maybe 100ft/lbs difference, if that. No game, or piece of paper you're shooting at is going to know the difference between the two.