While I've been a lifelong admirer of the 270 WCF the more I work with the 280AI the more I like that cartridge.

I'm pushing the 162 Amax (.625 BC!!!) to 3050 out of a 26" barrel with zero pressure signs and Quickload showing pressures below SAAMI MAP (65Kpsi)!

That is an amazing performance for 64 grains of powder.

My vote would be 280AI.