Magnum - A Desire For More Power | History Documentary Films

The.357 S&W Magnum, or simply.357 Magnum, is a revolver cartridge with a.357-inch (9.07 mm) bullet diameter, created by Elmer Keith, Phillip B. Sharpe, and Colonel D. B. Wesson of firearms supplier Smith & Wesson, and Winchester. The.357 Magnum cartridge was introduced in 1934, and its use has actually since become prevalent.
The.357 Magnum was collaboratively created over a period in the very early to mid-1930s by a group of individuals in a direct response to Colt's.38 Super Automatic. Tests at the time disclosed that those vests defeated any type of handgun cartridge traveling at less than around 1,000 feet per second (300 m/s).
.38 and.357 would seem to be various diameter chamberings, they are in truth the same, as 0.357 inches (9.07 mm) is the true bullet size of the.38 Special cartridge. The.38 Special language connects to the previous usage of heeled bullets (such as the.38 Short Colt), which were the same size as the situation. Therefore, the only exterior distinction in the 2 cartridges is a small distinction in length, solely for safety and security functions as described below.