The 22 CHeetah is a 308 case necked to 22 caliber. The 22 CHeetah Mk1 is an improved version with a 40 deg. shoulder. A cartridge that got some press in Handloader magazine April 2002 #216, is the 22-6mm Remington. Looks like a great performer, but with the large case capacity, it will burn the barrel out quickly. I know the 22-06 exists but I don't have any information on it. 8)
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