.22 CHeetah
The .22 CHeetah (both C and H are upper-case, referring to Carmichel / Huntington) is a .22 wildcat cartridge developed in the 1970s or 1980s by Jim Carmichel and Fred Huntington. The .22 CHeetah is essentially a Remington .308 BR (empty .308 Winchester cases), modified to fit the .22 caliber.