Here's the real discussion!
The handwriting was already on the wall since the 1940's for the rise of at least parallel use of some form of Intermeadate Cartridge . But the exact form was still in the air .
A full diameter , but smaller case , in the spirit of the 7.62x39 or 7.9x33 ? A medium bore , smaller case , somewhere between 6mm and 7mm diameter ? Or going whole hog in one swoop to .22 -ish bore ?
We know how it worked out , with USA being the 750 lb Gorilla of Military aid , and influencing NATO standardation . But the medium bore option never got full exploration , and if I had a clean sheet , that's where I'd start looking .