.500 Whisper

.500 Whisper
TypeRifle
Place of originUSA
Production history
DesignerSSK Industries
Specifications
Parent case.378 Weatherby Magnum
Case typebelted, bottlenecked
Bullet diameter.510 in (13.0 mm)
Neck diameter.549 in (13.9 mm)
Base diameter.582 in (14.8 mm)
Rim diameter.579 in (14.7 mm)
Rim thickness.063 in (1.6 mm)
Ballistic performance
Bullet mass/type Velocity Energy
750 gr (49 g) AMax 1,050 ft/s (320 m/s) 1,837 ft⋅lbf (2,491 J)
Source(s): SSK Industries, Ammo.org

The .500 Whisper or .500 Whisper Short Belted is a subsonic rifle cartridge developed by SSK Industries for use in suppressed rifles. It is capable of firing a .51 caliber bullet weighing 750 gr (49 g) at roughly 1,050 ft/s (320 m/s).