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?
Still happily answering to the call-sign Peetza.
The problem, as you so eloquently put it, is choice.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.