It's safe to say that the older, carburated cartridges have fewer followers. The availability of tiny Holley or Carter carberators has decreased dramatically since the late 1980s. Nowadaze, the new cartridges all feature electronic performance monitoring internals, straight walled combustion chambers and are fuel injected. Bullets too.
I agree about the 223. The US govt poured so much money into powders, bullets and barrels to make that thing work. It succeeded because it was a military cartridge. That's okay. For me anyway, what I don't like is the necks on them. In order to cram more propellant into the darn case, they shortened it. And as we all know, anything with a short neck isn't too bright or trustworthy. Just look at the WWF.