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So, honestly, if one were to have a 6.5X54 with a twist for lighter bullets, would there be any advantage to the Creedmoor?

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Huvius,
What advantage would you gain by going to a slower rate of twist for a lighter bullet.
140 grain spitzers are the same length as 160 round nose bullets and 129's are only a bit shorter.
My 1903 MS carbine seems to handle bullets from 129 through 160 grain about equally.

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I see, didn't see that it was loaded with 140-147s.
So, I guess my question should be, with modern powders, is the Creedmoor somehow inherently better at anything than the 6.5MS or the 6.5 Carcano?
Other than the shoulder angle, not much between them. 20 thou in base and less body taper to the shoulder on the Creedmoor but the MS and Carcano are a little longer. Is case capacity that different?