Here you go .22 S&W cartridge:

"Like its .22 caliber predecessor, the Hand Ejector is a seven shot, but the new gun is chambered for the .22 S&W Long cartridge. Daniel Wesson had originally intended to specify the .22 Long Rifle cartridge for the Hand Ejector but, due to the gun’s light weight, he found that bullets in the uncrimped black powder cartridges of the day would “jump forward and block the cylinder” when the gun recoiled. So Wesson designed a special cartridge for the gun which he called the .22 Smith & Wesson Long. The cartridge had the same 40 grain bullet as the .22 Long Rifle and, according to McHenry & Roper, the new cartridge “differed from the .22 long rifle only in that it was slightly crimped.”

The Smiith & Wesson .22 Hand Ejector