Could be 40 years or so ago, the 222 was a hot bench rest cartridge, along with a few others like the 219 Donaldson.
Along came the 22ppc, and within about 5 minits all the other cartridges were dead.
Created by 2 benchrest shooters by name of Pindell and Palmisano.
There was also a 6x47, which was the 222 mag necked up to 6mm, and offered by Remington in their 40x rifles.