Re: 280 Rem or AI
Correct me if I am wrong, but the beauty of the .280AI is that it is a very efficient cartridge in that it gives the maximum velocity, for the given powder charge. Basically it is 98% of a 7mm Rem Mag with 90% of the powder. Additionally, other than having your barrel "reamed" and fireforming your brass, there is no real difference to the day to day use, other than you can't really buy factory ammo. Though you can use standard .280 factory ammo, but not likely as accurately.
So, if you don't want to spend the money to ream your gun or take the time to fireform and trim the brass and are happy with having say 5% less performance than stick with the standard .280.
While it sounds like I am recommending the AI, my son has a .280 and I haven't converted it either. Doesn't mean I shouldn't.