.204 Ruger

.204 Ruger
File:R204bvmax.jpg 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
Specifications
Parent cartridge	.222 Remington Magnum
Case type	Rimless, 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 length	1.850 in (47.0 mm)
Overall length	2.2598 in (57.40 mm)
Rifling twist	1-12
Primer type	small rifle
Ballistic performance Bullet weight/type Velocity Energy 32 gr (2 g) BT 4,225 ft/s (1,288 m/s) 1,268 ft·lbf (1,719 J) 40 gr (3 g) BT 3,900 ft/s (1,200 m/s) 1,351 ft·lbf (1,832 J) 45 gr (3 g) SP 3,625 ft/s (1,105 m/s) 1,313 ft·lbf (1,780 J)
Source(s): Hornady

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.

Characteristics

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 (2.1 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 (1,300 m/s) with the 32-grain (2.1 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.

Development

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 (1.9 and 2.6 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 (91 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 (250 m).

Velocity

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.

Note that handloaders typically achieve velocities more in the area of 4,100 ft/s (1,200 m/s) using a 32-grain (2.1 g) bullet.

Note also that handloads using a 40-grain (2.6 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 (460 m).

Hornady now offers a 24g lead free cartridge that claims 4400 fps.

• Ballistics Chart By Hornady

.204 Ruger 32 GR V-MAX 83204	Muzzle	100 yd	200 yd	300 yd	400 yd	500 yd
Velocity/Energy (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
Velocity/Energy (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
Velocity/Energy (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 also

• 5mm/35 SMc
• List of rifle cartridges
• 5 mm caliber

References

• Cartridge Dimensions from 6mmBR.com
• Guns Magazine, 2004
• GunBlast.com, May 2004

External links

• .204 Ruger info at Hornady website
• Sturm, Ruger & Co., Inc.