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9x23 Winchester ammo and NOT 9x19 parabellum. This is not usable in 9x19 Parabellum pistol. I hope this helps!

Joshua, Caliber: 9x23mm Winchester (this is not 9mm Luger ammunition). The difference is pictured here : shootingtimes.com/editorial/cartridge-review-9x23-winchester/99601

It is 9×23.
The 9x23 Winchester cartridge is a powerhouse round that few have heard of. Too bad. It delivers .357 Magnum performance in a semi-automatic pistol.
In simplistic terms, the 9x23 Winchester is a stretched out 9mm Luger. Both are tapered cartridges with nearly identical neck, head and rim dimensions. The 9x23 case is 4mm longer, but more importantly the 9x23 operates at much higher pressure than the 9mm Luger. Winchester's 9x23 brass has an extra-thick case wall that allows this cartridge to run at high pressure without concern of a case blowout in the unsupported region of a conventional, non-ramped barrel.
The 9x23 is also a longer cartridge overall, and requires a full-sized pistol frame whereas the 9mm Luger can be housed in small-frame pistols.
The 9x23's Sporting Arms and Ammunition Manufacturers' Institute (SAAMI) maximum average pressure limit is 55,000 pounds per square inch (psi), the same as a .223 Rem. rifle round! Compare that to the 9mm Luger's 35,000 psi and its +P limit of 38,500 psi. The 9x23's older cousin, the .38 Super +P, whose case is the same length of 0.900", has a SAAMI pressure limit of 36,500 psi.

This is 9x23 Winchester, not a lot of (or any that I can think of) current production guns chambered for it. Not interchangeable with 9x19