It is built of S&W's special X-Frame because none of the existing revolver frames were capable of handling the muzzle energy, and recoil of .500 Magnum. This makes it the world most powerful revolver built today, and is sold as the world's most powerful hand gun.
Model 500 <.500 magnum> (above)
Model 629 <.44 magnum> (below)
Model 500 shot at night time.
The model 500 can fire 22.7 Grams bullet with 602 m/s muzzle velocity having 4100 J of energy, which is significantly larger then any and gun bullet we know to date.
This gun can kill any living thing on earth, including earth, just shooting whales could prove to be trickier.
Model 500 with compensator
Model 500 without compensator
Because of this revolver using the world's most powerful handgun production bullet, it has to most powerful recoil ever, to cancel to much excess recoil this gun uses compensator, forward balance, rubber grips and even shear weight of the gun is used to cancel the recoil.
Other then all of its qualities this gun has awesome style, and is available in 4, 6.5, 8.75 and 10 inch barrel variants.