If I keep reading about .280 Rem's, I'm liable to sell every rifle I own and buy one.
I know very little about the .280 AI, but I do know about the .280 Rem. It doesn't give up enough to the 7MM Rem Mag to cause any big game to know the difference, and I like 22" barreled rifles. And I also know that there's magic in .284 caliber bullets.