"So why didn't one of the factorys just adopt the 338-06" They did, It was adopted By A-Square, so for all practical purposes it is now refered to as the 338-06 A-Square. Haven't you heard of it? Probably not, in my opinion if you want to out a death sentence on something have A-Square get involved. Weatherby chambered it, in rifles when it was adopted and Norma makes the brass and loaded ammo. Why the death sentence, look at anything A-Square, i.e. expensive, No...VERY expensive! AND if it is now listed in SAAMI why hasn't Remington or Winchester started producing ammo? ( probably not enough instantanious $$$$) But then again I believe its a niche cartridge, like its big brother, the 35 Whelen, a cartridge the gun writers liked to pit against the 338-06 and make it look like the loser, eventually they won out. Also, IF one doesnt handload, I believe you will see them opt for the parents,30-06 or 308WCF long before going to one of the off spring.(ammo availability, price, popularity, all there buddies have one, etc.) Two very fine cartridges, one given a chance the other barely given, But as handloaders, it looks as though "we" do know better.