No sir, they are not.
357sig is a round based on a 40 caliber (or 10mm) cartridge necked down to 9mm (.355 inches). They will not fit or work in a 357mag.
BTW, your use of the
confuses me a bit. It makes me think that your question is in jest. If you are serious and are wishing to "smile" at us then the appropriate emoticon would be this
.
Oh my God, emoticon etiquette. Who'd have thunk?
