I like the 270Win. Think it is perfect for lighter bullets and it’s intended hunting purpose. Just bought one for my son. Cannot however think of any way it is better than a 280ai except for factory ammo availability.The 270 win is more awesome sauce then a 280 ai, except for the fact that it can stabilize heavier rounds which is the reason why .277 has such a lousy selection of bullets compared to .284 or .264.
Imagine if 270 win was spec'd for a 1:7.5" twist barrel all these years? Who would want or need many of the 7mm or 6.5mm rounds?
270 win with a 10" twist has made it a 130gr one trick pony. It would have been nice to shoot 160gr boats at 2800+ fps all these years, but it is crippled. Think of a 7mm RM with an 11" twist barrel? Nobody in their right mind would make that barrel.
Sorry, but my 270 win with the 10" twist barrel doesn't excite me. My 30-06 can shoot < 145gr bullets fast for hunting at closer ranges and put just as much hurt on an animal.