JagMagMan, There is one exceptionally good reason to have 2 of the same cartridge if not the same rifle. That would be if you hunt out of state often. If you have ever experienced a rifle failure upon arrival at your destination you would know exactly what I am talking about. I always take a backup rifle and having one that shoots the same as your main is not a bad thing at all.
Bronko22000, As Nomercy448 said, there really isn't much, as far as hunting goes, that the 284 can do that the 7mm-08 can't do. Especially since you are an experienced reloader.