DO NOT ATTEMPT THIS!!. Never fire ammunition in a weapon that it is not chambered for.
No.
The .357 Sig is a 9mm projectile, loaded into a necked down .40 S&W casing.
No. .357 Sig and 9mm are two completely different calibers and not interchageable.
No. You can get a Sig P229 that will fire .357 Sig, but that is not the same as .357 magnum.
No. Some .40/.357 Sig pistols can be converted to fire 9mm simply by dropping in a 9mm barrel and using the 9mm magazines, though. Not sure about the Glock.
9mm will have the least kick, follwed by the 40, then the 357.
The ammunition is called .357 Sig. Most pistols in .357 Sig can shoot the .40 S&W when you drop in a .40 S&W barrel.
This seems to be a persistent myth. The .40 S&W/.357 Sig magazines are not compatible with 9mm Glocks.
Either the SIG or S&W
50-500 usd
No. The .357 SIG is a bottlenecked cartridge. It is fatter and longer than the 9mm Parabellum. ALSO, please note that many auto pistol cartridges headspace on the case mouth, and are VERY sensitive to length differences.
357 sig is a cartridge that is a relatively high speed handgun round. It is not a pistol itself, many, many pistols are chambered for this cartiridge.