The only advantage I can see with a 1/9 twist 270 is a bit of a faster spin may result in better penetration, but not much.

The reality is, a plain 30-06 shooting 150's will shoot just as well (and better in a shorter barreled rifle) as any 270 out there.

A velocity junkie going the route of 20" barreled 270's sounds like an oxymoron to me.

I have 700 Ti's in 270, 280 Ackley, and 30-06. I like results I see with the 28 and 30 more than the 27.