Problem. While the distinction you make may be true, the OP asked about bang flop with a .270. A deer can't tell you the difference between 3100 ft lbs and 36oo ft lbs. of energy. It is just as dead either way. I think this level of debate misses the point. How dead is dead? If the only real way to tell the difference is with precision pressure measuring instruments calibrated and used by engineers in a lab, then I think your point is moot.
If a .270 win with a 150 gr A-Frame bullet generates just under 3000 ft per second fps and 2705 ft/lbs of energy at the muzzle, and most hunting regs/magazine/printed words suggest that 1000 ft-lbs is enough to humanely harvest a deer, isn't the .270's 1600 ft-lbs overkill or the 300 win mags 2600 ft-lb overkill again a moot point? Once the bullet exit the animal it is wasted energy anyways.
If more power is better than why not a .375 H&H, a 458 Lott, 700 Nitro or an artillery shell? How dead does your deer need to be? Experience, not number is the ultimate test. Countless have testified that .270s bang flop just fine.