Interesting, I was at the range yesterday and someone had a 270 Win AI!
The 270 AI version with his handloads of 150 gr. Partitions produced between 2974 FPS and 3017 FPS over the Chrony. 24" barrel Model 70. Accuracy looked to be about 1" at the 100 yard backstop.
Apparently, you can get those velocities nowadays with RL26, so no need for the AI; else, likely get even more with the AI if that's what you really want.
