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.204 Ruger
204 Ruger 32 grain (2.1 g) Vmax, 223 Remington 55 grain (3.6 g) Vmax, 204 Ruger 40 grain (2.6 g) Vmax.
Type Rifle
Place of origin USA
Production history
Designer Ruger/Hornady
Designed 2004
Produced 2004–Present
Parent case .222 Remington Magnum
Case type Rimless, bottleneck
Bullet diameter .204 in (Bad rounding hereScript error mm)
Neck diameter .2311 in (Bad rounding hereScript error mm)
Shoulder diameter .3598 in (Bad rounding hereScript error mm)
Base diameter .3764 in (Bad rounding hereScript error mm)
Rim diameter .378 in (Bad rounding hereScript error mm)
Rim thickness .0449 in (Bad rounding hereScript error mm)
Case length 1.850 in (Bad rounding hereScript error mm)
Overall length 2.2598 in (Bad rounding hereScript error mm)
Rifling twist 1-12
Primer type small rifle
Ballistic performance
Bullet weight/type Velocity Energy
32 gr (Bad rounding hereScript error g) BT4,225 ft/s (Bad rounding hereScript error m/s)1,268 ft·lbf (Bad rounding hereScript error J)
40 gr (Bad rounding hereScript error g) BT3,900 ft/s (Bad rounding hereScript error m/s)1,351 ft·lbf (Bad rounding hereScript error J)
45 gr (Bad rounding hereScript error g) SP3,625 ft/s (Bad rounding hereScript error m/s)1,313 ft·lbf (Bad rounding hereScript error J)
Source(s): Hornady [1]

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


The 204 Ruger was developed from the .222 Remington Magnum, which has the second largest case capacity in the family that began with the .222 Remington. Only the European 5.6x50 Magnum is larger, which itself is a lengthened version of the 222 Remington Magnum. The 222 Remington Magnum provides about 5% more usable (below the neck) case capacity than the most popular member of the family, the NATO 5.56×45 mm (.223 Remington). To make the 204 Ruger, the 222 Remington Magnum case was necked down to .204 inches (5 mm) and shoulder moved forward and angle increased to 30 degrees. Bullets available in .204 caliber range from 26 to 50 grains (1.7 to 3.25g). The Hornady factory load is listed at 4,225 ft/s (1288 m/s) with a 32-grain (Bad rounding hereScript error g) bullet. To achieve these velocities, the factory uses a proprietary powder composition known internally as SMP746, specially formulated by Primex, and not currently (2013) available to handloaders. The propellant features a de-coppering agent that helps prevent fouling. Reloading data from Hornady, using commercially available powders, indicate velocity peaking at just under 4,200 ft/s (Bad rounding hereScript error m/s) with the 32-grain (Bad rounding hereScript error g) bullet in longer barrels. Many AR-15 rifle manufacturers now offer the .204 Ruger as an alternative chambering alongside the usual 5.56x45/.223 Rem.


The .204 Ruger was the second Ruger-named cartridge produced by a partnership between Ruger and Hornady, the first being the big bore .480 Ruger revolver cartridge introduced in 2003 for the Super Redhawk. With the backing of a major gunmaker and a major ammunition company, the round was an instant success, with other ammunition makers and firearms makers quickly adding the new chambering. Ruger's initial offerings included the bolt action Model 77 MKII, and the single shot Ruger No. 1, and Hornady offered loadings with 30-and-40-grain (Expression error: Unrecognised punctuation character "[". and Expression error: Unrecognised punctuation character "[". g) bullets.

The .204 Ruger has proven to be a very accurate and efficient cartridge: an early tester reported 1/2 MOA groups at 100 yards (Bad rounding hereScript error m) with the Hornady loads and a Ruger #1 Varmint rifle. This is not surprising, considering that the first cartridge in the family, the .222 Remington, was a top benchrest shooting cartridge for many years after its introduction.

The .204 Ruger was intended primarily for varmint rifles, which require bullets with flat trajectories but not much mass or kinetic energy. The .204 was "splitting the difference" between the popular .224 varmint rounds such as the .220 Swift and .22-250 Remington, and the tiny .177 caliber rounds such as the .17 Remington and the .17 HMR. The resulting cartridge provides somewhat higher velocities than any of these, giving a maximum point blank range of more than 270 yards (Bad rounding hereScript error m).


Ruger's claim to being the velocity king with the .204 was based on two points.

First, no other high performance 20 caliber cartridge was commercially produced. Second, the ammunition used to achieve the 4225 ft/s was available only from Hornady using a special powder not available to the general public.[2]

Note that handloaders typically achieve velocities more in the area of 4,100 ft/s (Bad rounding hereScript error m/s) using a 32-grain (Bad rounding hereScript error g) bullet.[3]

Note also that handloads using a 40-grain (Bad rounding hereScript error g) bullet in other commercial cartridges such as the .22-250 Remington also achieve velocities similar to those of the .204 Ruger. The advantage of the .204 Ruger is that it achieves these velocities with less powder, less recoil, and less heat than the larger cartridges. The 204 Ruger has a maximum range of approximately 500 yards (Bad rounding hereScript error m).

.204 Ruger 32 GR V-MAX 83204 Muzzle 100 yd 200 yd 300 yd 400 yd 500 yd
(fps) / (ft-lbs)
4225/1268 3645/944 3137/699 2683/512 2272/367 1899/256
Trajectory (inches) -1.5 0.6 0.00 -4.1 -13.1 -29.0
.204 Ruger 40 GR V-MAX 83206 Muzzle 100 yd 200 yd 300 yd 400 yd 500 yd
(fps) / (ft-lbs)
3900/1351 3482/1077 3103/855 2755/674 2433/526 2133/404
Trajectory (inches) -1.5 0.7 0.00 -4.3 -13.2 -28.1
.204 Ruger 45 GR SP 83208 Muzzle 100 yd 200 yd 300 yd 400 yd 500 yd
(fps) / (ft-lbs)
3625/1313 3188/1015 2792/778 2428/589 2093/438 1787/319
Trajectory (inches) -1.5 1.0 0.0 -5.5 -16.9 -36.3

See alsoEdit



External linksEdit

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