.204 Ruger

.204 Ruger
A .204 Ruger cartridge (left) compared to .223 Remington (right)
TypeRifle
Place of originUnited States
Production history
DesignerRuger/Hornady
Designed2004
Produced2004–present
Specifications
Parent case.222 Remington Magnum
Case typeRimless, bottleneck
Bullet diameter.204 in (5.2 mm)
Neck diameter.2311 in (5.87 mm)
Shoulder diameter.3598 in (9.14 mm)
Base diameter.3764 in (9.56 mm)
Rim diameter.378 in (9.6 mm)
Rim thickness.0449 in (1.14 mm)
Case length1.850 in (47.0 mm)
Overall length2.2598 in (57.40 mm)
Rifling twist1-12
Primer typeSmall rifle
Ballistic performance
Bullet mass/type Velocity Energy
32 gr. (2.1 g) BT 4,225 ft/s (1,288 m/s) 1,268 ft⋅lbf (1,719 J)
40 gr. (2.6 g) BT 3,900 ft/s (1,200 m/s) 1,351 ft⋅lbf (1,832 J)
45 gr. (2.9 g) SP 3,625 ft/s (1,105 m/s) 1,313 ft⋅lbf (1,780 J)
40 gr. (2.6 g) Hornady V-Max, Norma 3,806 ft/s (1,160 m/s) 1,195 ft⋅lbf (1,620 J)
24 gr. (1.55 g) Hornady Super Performance varmint ammunition 4,400 ft/s (1,341 m/s) 1,032 ft⋅lbf (1,399 J)
Source: Hornady Norma

The .204 Ruger / 5.2x47mm is a centerfire rifle cartridge developed by Hornady and Ruger. At the time of its introduction in 2004, the .204 Ruger was the second-highest velocity commercially produced ammunition and the only centerfire cartridge produced commercially for bullets of .204 inch/5 mm caliber.

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