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Jeff, the 357Sig is a 40S&W case necked down to 9mm. Both 357Sig and 40S&W can use the same magazines since they share a common case head. The handgun however, will only fire the round for which it's barrel is chambered which will be either 357Sig or 40S&W but not both.
James G.
7 years ago
Jeff, the 357Sig is a 40S&W case necked down to 9mm. Both 357Sig and 40S&W can use the same magazines since they share a common case head. The handgun however, will only fire the round for which it's barrel is chambered which will be either 357Sig or 40S&W but not both.
Steve P.
7 years ago
