The 9x23 Winchester was designed by Winchester and introduced in 1996. The chambering was designed to meet a specific requirement of the International Practical Shooting Confederation (IPSC) competition and is not well known outside that discipline. IPSC competitors have struggled for years to conduct the lowest-recoiling load that will qualify for Major Power Factor designation. While the 9x23 Winchester looks like a stretched 9mm Luger, there are significant internal differences. The 9x23 Winchester has an unusually thick web section. This prevents the dangerous case-wall blow out that can occur with any conventional pistol cartridge when an unusually high pressure loading is fired in a gun with a feed ramp in the bottom of the chamber that extends further forward then the “solid” portion of the case (web). The 9x23 Winchester case has sufficient capacity to allow IPSC shooters to achieve Major power factor using relatively light bullets and without generating gun wrecking pressures.
This text is based on information from “Cartridges of the
World”, Hodgdon reloading manual, the cartridge designer and/or