Even though I have an 84L Montana in 30-06, I am thinking the 280AI may be a must-have chambering.
As close as the 280AI treads on the heels of the 7WSM, and with the 84L Montana 1/2 pound lighter than the 7SM 8400 Montana to-boot, the 280AI in an 84L just has so much going for it.
With the 30-06 and the 280AI being so close in performance, it doesn't make much sense for me to get one.
But I think I need one anyway.
_
The thing about the .280AI is that it's not really a Magnum! As you point out its close however sometimes a magnum will not reach far enough at least in theory.
Since I have a 7mm WSM that weighs less than a M70 Featherweight I have no want for a 280AI today. At least the way I use 'magnums'.
To each his own.
On the other hand if this were a 280AI I might take it.