Oh yea it's a 243 necked down to .224 cal.
Which means it is actually a .308 necked down to .224. If you do the same thing with a .308 Benchrest cartridge you have the .22 Cheetah. I wanted one of those for years based on velocity and accuracy but it seems like the .308 Benchrest brass went away. Other than that, I think they are the same cartridge.