To be completely honest with you, the 270 is the last cartridge I would AI!
It has all the velocity you could want in that size case, it really is the first magnum.
If you want more performance, do what I did and re-barrel to 270Weatherby, now this is one cartridge worth all the hype!
It will push 150gr bullets as fast as the 270 can push 110gr bullets! Albeit with a longer barrel of course!
There really is not much gain to be made by AI'ing the 270, it will all likelyhood only achieve an extra 50fps, maybe a little bit more if you're lucky.