|Smith & Wesson Model 13|
"This Smith & Wesson Model 13 has a three-inch barrel and a ten-bullet chamber. Customized as a combat revolver with refined double-action tuning and a recontoured trigger, it is the most powerful standard issue handgun available." - Jagged Alliance Manual
"This Smith & Wesson Model 13 has a three-inch barrel and a six-bullet chamber. Customized as a combat revolver, with refined double-action tuning and a recontoured trigger, this baby packs a punch. Can also fire .38 ammunition." - Jagged Alliance ingame description
The .357 Magnum revolver in Jagged Alliance is a S&W Model 13 (called simply a .357 Magnum). This revolver model does not appear in Jagged Alliance 2, and its closest relative is likely the Colt Python from Jagged Alliance 2: Wildfire.
The .357 Magnum is notable for being the most powerful handgun that can be equipped with a silencer, which can be done after extending the barrel with a Chunk of Steel.