Absolutely it is!
Zeliska revolver (by Pfeifer Waffen) is chambered for two cartridges: .458 Winchester and .600 Nitro Expess. A 900 grains .620 bullet can run out the Zeliska's 15" barrel at about 1650 fps (5439 ft/lbs) with the lighter loads and at almost 1950 fps (7597 ft/lbs !!!). So these data will unquestionably make the Zeliska revolver the most powerful handgun in the world, two to three times more powerful than the .500 S&W!
No.
In most cases, the shotgun.
The .357 Magnum is more powerful, all day long.
Power is not determined by the make of the gun, but by the caliber of the cartridge that it fires. The Desert Eagle was made in several calibers. There are revolvers that fire less powerful cartridges, and revolvers that fire more powerful cartridges.
Better is a relative term- you need to specify better for what. Semi auto pistols tend to be flatter than revolvers, and MAY hold more cartridges. Revolvers MAY fire a more powerful cartridge than a semi auto (not always). A revolver is simpler to operate, and functioning is more reliable.
Neither, both can kill you.
It's the round which makes the difference, not the pistol. A .45 automatic pistol is going to be more powerful than a .38 revolver, for example. There are revolvers chambered in cartridges such as the .454 Casull and .500 S&W Magnum, which aren't available in any automatic pistols, but it's still ultimately the round which matters, and not whether it's an automatic or revolver.
more powerful most powerful
The first Enfield revolver dated to 1880- but there have been a number of models, You have to be more specific to get a more specific answer.
A revolver4 is a pistol, however if you're talking about semi auto vs revolver, or mm vs gauge... Semi auto allows you to fire more rapidly and can carry more ammo, however many feel that a revolver is more accurate.
The Pfeifer Zeliska 28mm Revolver is the worlds most powerful handgun but it is also pretty worthless because its too large to use effectively as you would a normal pistol. I would just stick to the Smith & Wesson 500 mag its something you could actually wear on your side like a pistol should be carried.
You will have to be more specific.