What is .38 super auto?

The .38 Super Auto is a pistol cartridge that was introduced in 1929 by Colt. It was designed to be a high-performance alternative to the .38 Special cartridge for use in self-defense and law enforcement applications. The .38 Super Auto uses a longer case than the .38 Special, which allows for a higher powder charge and greater velocities. The bullet diameter is .356 inch (9.04 mm) and typical bullet weights range from 115 to 147 grains. The .38 Super Auto has a reputation for delivering excellent accuracy and penetration, making it a popular choice for competitive shooting and personal defense. The cartridge's popularity has waxed and waned over time, but it remains in use by numerous law enforcement agencies and civilian shooters around the world.