Well, .270 is my favorite cartridge and I see no reason to go to A I. I have nothing against a .280, I think they are two peas in a pod. But there is a reason the .280 benifits form being A I'ed as I stated before. P.O. Ackley stated that of all the cartridges he improved the .250 was best and .257 was second. The two most efficient cartridges he worked with.
