.44 AMP

Photo coming soon: side view on a transparent background, with author and license.

Key specs

Type: Pistol
Origin: United States
Introduced: 1971
Case type: rimless, straight
Bullet diameter: 10.90 mm
Case length: 32.97 mm
Overall length: 40.64 mm
Parent case: .30-06 Springfield

Sources

Wikipedia: .44 AMP, Wikipedia