No way to answer without more information. Both perform as designed.
Neither. They both perform as designed. Barring any more information the answer can not be narrowed.
In order, it would go .357 Magnum, .357 Sig, and then .40 S&W. Actually, .357 magnum is almost always more powerful than .40. "Power" usually refers to muzzle energy. Muzzle energy of a .357 magnum ranges from 575 to almost 800 depending on the load, where .40 SW normally ranges from 425 to 525 at the most. .357 Sig ranges from a little over 500 to around 775, so it is comparable to the .40. Size of the cartridge or size of the bullet in the cartridge does not necessarily correlate directly to power. In other words, just because one cartridge is a larger caliber than another, doesn't not mean it is more powerful than the smaller one. It depends on several factors, such as cartridge specification, and the length of the barrel of the gun it is fired from.
Yes, you can fire a .357 Sig round (not a .357 Magnum) in it, but you must first change out the .40 barrel for the .357 barrel.
Yes and no. The. 40 S&W is not interchangeable with the .357 Magnum, if that's what you had in mind. Most .357 Sig pistols can, however, but a .40 barrel will have to be dropped in in place of the .357 Sig barrel.
The .38-40 Winchester Center Fire (WCF) has a slightly longer case than the .357 Magnum - 1.30 inches vs. 1.29 inches for the .357 Magnum. They both have an overall length of 1.59 inches. However, the two cartridges are in no way compatible, nor are they compatible for reloads in the other caliber.
40-800 usd
The weight of a .357 Magnum cartridge varies slightly depending on the specific bullet type and manufacturer, but a typical .357 Magnum round weighs around 158 grains (about 10.2 grams). When considering the weight of a revolver chambered for .357 Magnum, it can range from about 24 ounces (1.5 pounds) to over 40 ounces (2.5 pounds) depending on the model and materials used.
The Desert Eagle was never made in .40 - available chamberings included .357 Magnum, .41 Magnum, .44 Magnum, .50 Action Express, and .440 Cor-Bon.
357 has more stopping power. It also has quite a bit more recoil, though.
No. Revolvers use the rimmed .357 Magnum cartridge. While there are automatics designed to fire this cartridge (Coonan and Desert Eagle, primarily), it's not the same as the cartridge you had in mind. If you saw a Glock marked '.357', that means it's chambered for the .357 Sig cartridge - not the .357 Magnum. While the .357 Magnum is essentially a lengthened .38 Special, the .357 Sig is an entirely different cartridge, consisting of a .40 S&W casing, necked down to fit a 9mm projectile. The cartridge name is a reflection of the attempts at the designer to come up with an automatic pistol cartridge which could duplicate the performance of the .357 Magnum.
40-400 usd
No