The .22 jet was chambered in Smith and Wesson model 53revolvers in 1961 until it was discontinued in 1971. it wasnt very sucessful because of the use of a tapered case in a cylinder. When the gun was fired the cases had a tendancy to slip backwards andlock the gun up. the pistols also came with 6 adapter cartridges to allow a person to fire 22 long rifle ammoalso. it was also chambered in the marlin 62, H&R topper and TC also made guns in this caliber. it developed about 2460 fps with a 40gr bullrt and had a muzzle energy of about 535 ft.lb.