guns and ammo

Question
i know that with a .357 revolver you can still use .38 but can you do the same with a Glock .357???

Answer
Brian,

In a stunning upset in the industry, Glock was the first firearm to be chambered in the then-new .357 SIG round developed by SIG Sauer.

The .357 SIG is so called because it seeks to duplicate the ballistics of the vernerable .357 magnum revolver cartridge, but it is an entirely different cartridge.

In the first place, it is not truly .357 but actually .355 (=9mm).  The cartridge is basically a .40 S&W case, necked down to accept a 9mm bullet.

In the past, the only 9mm to ever gain traction in the firearms industry was the old 9x19, or 9mm Parabellum as it is sometimes called, developed by Georg Luger circa 1903.

SIG knew that to call this a 9mm would spell its demise, so instead they sought to duplicate the ballistics of the old .357 Magnum, and offer it as an auto cartridge - the .357 SIG.

In short, they are two different cartridges, and the revolver cartridge will not work in the autopistol.  However, since the .357 SIG is a necked down .40, a .40 S&W barrel is the only change needed to convert a firearm chambed in .357 SIG to a .40 S&W (benefit:  the ammo for the .40 is cheaper, and actual street data indicate that the .40 is a better stopper).

Hope this helps.  Stay safe!