Buddy of mine showed me a box of Jet .22 cartridges yesterday and asked if I'd ever heard of them. Told him no. Anyone have any idea what the heck a Jet .22 or a .22 Jet is? The cartridges looked like a mini high-powered rifle cartridge, but the casing is really fat and only about 1 1/2" long. They had a pointed soft point tip. I think the box said 40 gr. so I'm guessing an old varmint caliber...