The answer is that it depends.
I am only aware of two semi-automatic pistols chambered in .357 Magnum that are manufactured in any appreciable quantity.
The first is the Desert Eagle, famous for its laughable uses in movies and video gaming.
The second is the Coonan Model-357.
The Desert Eagle is purely a novelty gun that has few if any practical applications. The gun is ill-tempered, maintenance intensive, unreliable, and very unforgiving to inexperienced shooters.
The Coonan 357 is a well made firearm that can reliably use, and cycle the .357 Magnum round and will give performance roughly equal to a 6" barrel revolver despite its 5" barrel due to a lack of cylinder gap. That said the Coonan is also an expensive firearm, and unless you just really want a semi that shoots .357; there is no job other handguns in different calibers cannot do for considerably less money.
Depends on which .357 round you had in mind. .357 Magnum in a semi auto handgun makes for a rather cumbersome firearm with little practical application. .357 Sig is a more practical handgun cartridge, although you'd always want to go with JHP ammo, as overpenetration is a definite factor with this round.
No - neither a semi-automatic .357 Magnum nor a semi-automatic .357 Sig will. .357 Magnum revolvers can fire .38 Special rounds because 1: they feed from a cylinder which can accommodate the shorter .38 Special round and 2: unlike a firearm with a chamber, the cylinders in a revolver do not need to be headspaced.
There are a very few semi-auto pistols that shoot .357 magnum (not .357 Sig). While they will fire .38 Special, it is as a single shot- they will not cycle the action.
Yes, there have been a couple. At least one company (Coonan) has built a semi auto pistol that fires the .357 Magnum cartridge. A much more common find would be handguns built in the .357 Sig caliber. This is a bottlenecked .357 cartridge intended to duplicate the performance of the .357 magnum, but in an auto pistol cartridge.
Yes.. offhand, I know of two. Magnum Research made the Desert Eagle available in .357 Magnum, and Coonan Arms manufactured a semi-auto .357 Magnum, based on the M1911 pattern pistols.
A .357 Magnum revolver can, as it uses cylinders and does not require headspacing between a cartridge and a chamber. Semi automatic, lever action, etc. .357 Magnum firearms which use a headspaced chamber cannot, however.
What you describe was never offered for sale by S&W
No. 357 SIG and 357 Magnum are two very different cartridges. You can use .38 Special in a .357 magnum gun, but not 357 SIG Adding to the above, the compatibility of .38 Special and .357 Magnum applies only to revolvers. You cannot cycle .38 Special in a magazine fed .357 Magnum lever action or semi automatic.
.357 mag in revolver .45 auto in semi auto
Yes. Your revolver will fire either one.
Only the Coonan Arms .357 and .357 models of the Desert Eagle can do this.
Coonan Arms
No, the only .357 auto is a Sig. Different shaped chamber.