The .50 Action Express (AE) is a large caliber handgun cartridge developed by Evan Whildin of Action Arms in 1988. It is a semi-automatic pistol cartridge that fires a .50 inch (12.7 mm) bullet, and it was designed to offer higher power than existing handgun cartridges, such as the .45 ACP.
The .50 AE cartridge has a case length of 1.285 inches (32.6 mm) and can be loaded with bullets ranging from 300 to 400 grains. The cartridge typically produces muzzle velocities of around 1,200 to 1,500 feet per second (fps) and muzzle energies of up to 1,500 foot-pounds (ft-lbs), making it a powerful option for handgun hunting and self-defense.
The .50 AE cartridge is primarily used in the Desert Eagle semi-automatic pistol, which was designed specifically to handle this cartridge. Due to its high power and recoil, the .50 AE is not a suitable cartridge for all shooters, and proper training and experience are required to handle it safely and effectively.