.50 Action Express
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The .50 Action Express is a large-caliber handgun cartridge, best known for its usage in the Desert Eagle. Developed in 1988 by American Evan Whildin of Action Arms, the .50 AE is one of the most powerful pistol cartridges in production. Wikipedia
Bullet diameter: .500 in (12.7 mm)
Designed: 1988
Maximum pressure: 36,000 psi (250 MPa)
Produced: 1988–present
Rifling twist: 1:19 in