But here is the reason why this kind of radical cartridge design won't work;
Assume peak pressure is held to 65,000 lb/in2 (to keep from yielding the chamber wall).
Also assuming that maximum velocity is our goal then acceleration inside the barrel needs to be maximized.
Let's also ignore pesky little details like stiction, friction and stuff like that.
A .224 in diameter bullet has an area of: .0394 in2 and a Mass of 3.56 grams.
Force = Pressure X Area
Force = 65,000 lb/in2 X .0394 in2
Force = 2,561 lb (1161.7 kilograms)
On their website, the targets they showed that were shot with this round were getting pretty big groups, about 10cm for every 100m, or about 4 MOA. Not really an accurate round out of any of the rifles it was fired from, and that's just what they're showing.
To me, personally, it's just another necked-down wildcat varminting cartridge with some fancy bullets, nothing more.