.577/500 No. 2 Black Powder Express

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

Key specs

Type: Rifle
Origin: United Kingdom
Introduced: 1879
Case type: rimmed, bottleneck
Bullet diameter: 12.88 mm
Case length: 71.88 mm
Overall length: 86.36 mm
Typical bullet: 300 gr
Typical velocity: 570 m/s
Typical energy: 3,173 J

Sources

Wikipedia: .577/500 No. 2 Black Powder Express, Wikipedia