They should've called the .270win the .277win in the first place.
It's called a .270 because that is the bore diameter of the barrels before the rifling is cut. The groove diameter (groove togroove)is .277 inches as is the bullet diameter.
Same with any 300 mag, 30-06, 280 Remington, .330 Dakotaetc... etc...
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I'm aware of the how and why, I was attempting a joke, didn't really come out right. Hard to show voice inflection with typing.
I honestly could care less, if they invent a 1000 more cartridges, They are in business to make money not to stay with the standard. But, there's no point to it.