.300 Whisper

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

Key specs

Type: Rifle
Origin: United States
Introduced: 1990
Case type: rimless, bottleneck
Bullet diameter: 7.84 mm
Case length: 34.90 mm
Overall length: 57.00 mm
Typical bullet: 220 gr
Typical velocity: 317 m/s
Typical energy: 717 J
Parent case: .221 Remington Fireball

Sources

Wikipedia: .300 Whisper, Wikipedia