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.
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.
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.
In a .44 Magnum revolver, yes. In a semi-automatic .44 Magnum (such as the Desert Eagle), no.
It is a semi-auto pistol. Fires one shot per pull of the trigger. It is not a machinegun.
Schwarzlose pistol
No, it is a semi-automatic.
Yes, it is a CO2 powered, semi-automatic pistol.
Germany
only a pistol is an semi-automatic. revolvers are not semi auto. A "pistol" is a generic term to refer to ANY handgun, revolver or Semi-automatic. Wrong! Only some one completely unfamiliar with hand guns nomenclature would call a revolver a pistol. A revolver is commonly referred to as: "revolver, wheel gun or shooter (short for 6 shooter)." A semi automatic is commonly referred to as: "semi auto or pistol."
Since pistol can be used to describe both a revolver and a semi-automatic, I would guess to you mean the former. Made in Germany by Rohm. Worth 50-100.
"Magnum" refers to the cartridge, not the firearm. The Desert Eagle fires Magnum cartridges. What you're probably asking is the difference between a revolver chambered for Magnum cartridges, and a Desert Eagle semi automatic pistol. Of the two, the revolver would typically be much more practical.
Mannlicher in 1894.