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.458 SOCOM
458SOCOM.jpg
55gr 5.56 NATO vs 500gr .458 SOCOM
Type Rifle
Place of origin United States
Production history
Designer Teppo Jutsu LLC
Specifications
Parent case None
Bullet diameter 11.63 mm (0.458 in)
Neck diameter 12.32 mm (0.485 in)
Shoulder diameter 13.49 mm (0.531 in)
Base diameter 13.74 mm (0.541 in)
Rim diameter 12.01 mm (0.473 in)
Rim thickness 1.04 mm (0.041 in)
Case length 40.00 mm (1.575 in)
Overall length 57.40 mm (2.260 in)
Rifling twist 1 in 14" (most common) or 18"
Primer type Large Pistol
Maximum pressure 35,000psi
Ballistic performance
Bullet weight/type Velocity Energy
250 gr (16 g) SP 655 m/s (2,150 ft/s) 3,478 J (2,565 ft·lbf)
300 gr (19 g) HP 580 m/s (1,900 ft/s) 3,261 J (2,405 ft·lbf)
325 gr (21 g) FTX 566 m/s (1,860 ft/s) 3,384 J (2,496 ft·lbf)
405 gr (26 g) JFP 489 m/s (1,600 ft/s) 3,148 J (2,322 ft·lbf)
600 gr (39 g) RN 304.8 m/s (1,000 ft/s) 1,811 J (1,336 ft·lbf)

The .458 SOCOM [11.63 x 40 mm] is a moderately large round designed for a specialized upper receiver that can be mounted on any AR-15 pattern lower receiver. The 300-grain (19 g) round offers a muzzle velocity of 1,900 ft/s (580 m/s) and 2,405 ft·lbf (3,261 J).[1]

History[edit]

Inspired by the lack of power offered by the 5.56 NATO cartridge used in the M4 carbine and the M16 rifle, the .458 SOCOM came about from informal discussion of members of the special operations community, specifically Task Force Ranger's experience that multiple shots were required to neutralize members of the opposing force in Mogadishu during Operation Gothic Serpent. Marty ter Weeme of Teppo Jutsu designed the cartridge in 2000 and Tony Rumore of Tromix was contracted to build the first .458 SOCOM rifle in February 2001. Tony Rumore fired the very first round of .458 SOCOM ammunition in the Tromix shop located in Broken Arrow, Oklahoma on February 16, 2001, at 8:30pm.

The project sponsor set forth a number of specific requirements that led to the ultimate design as it stands right now[when?]: The cartridge had to fit in the M-4 carbine platform and magazines and be capable of firing heavy-for-caliber projectiles at subsonic velocity using suppressors. During the developments phase, various other cartridges were considered and proposed to the project sponsor, but rejected as not meeting all the requirements. The cartridges considered were 7.62×39mm, 9×39mm Grom, .45 Professional (which has since become the .450 Bushmaster), and .50 Action Express. At the time, the .499 LWR cartridge was still in development phase and had not been chambered commercially.

The .45 Professional was ruled out because in an interview with industry press, the developer of said cartridge stated that steel proprietary to General Motors was used in the bolts and extensions to withstand the high operating pressures. The .50 AE and .499 LWR were ruled out because in 2000 only two bullets were offered in .501 diameter, both developed as pistol bullets for the .50 AE and not heavy enough for the subsonic suppressed role. Research had indicated that a short belted cartridge called the .458 × 1.5" Barnes had been adopted for use in suppressed bolt-action rifles for use in SE Asia during the Vietnam War. It was shown as effective in terms of ballistics, firing a 500 grain bullet subsonically, but not ideally suited for its role due to the size and weight of the platform. Combined with the wide selection of bullets available in .458 diameter, this cemented the choice of caliber.

The cartridge case design was finalized based on discussions with Tony Rumore at Tromix suggesting a lengthened .50 AE case would work well in the magazines as well as be the largest diameter case to be able to feed through the barrel extension. The rim size was chosen for compatibility with other platforms, primarily bolt-action rifles, as the .473-inch-diameter rim is arguably the most common rim size globally (all bolt actions chambered in 7.92×57mm Mauser, .30-06 Springfield or .308 Winchester share this rim size). The case length was chosen to be compatible with the Barnes 300-grain X Spitzer bullet. In 2009, Barnes developed a new bullet specifically for use in the .458 SOCOM, the 300 grain Tipped Triple Shock X, also known as the TTSX or TAC-X.

As noted above, the cartridge was designed to be 100% compatible with the M4 platform. This included the buffer, buffer spring, GI magazines, many aftermarket .223/5.56 magazines, and magazine well. In .223/5.56 caliber, cartridges stack in a staggered (double stack) fashion. However, with the much larger .458 SOCOM, rounds "single stack" without any modification to the standard GI magazine feed lips or follower, making it the most versatile and cost effective big bore offering in an AR-15 platform. A standard 20-round 5.56mm NATO magazine can hold seven .458 SOCOM rounds and a standard 30-round 5.56mm NATO magazine can hold ten .458 SOCOM rounds.

Today, .458 SOCOM rifles and complete upper halves are available from Rock River Arms and Tromix. Disappear Gear and Wilson Combat offer barrels and uppers although they do not use designer-copywrited reamers and functionality may be compromised. Barrels and bolts can be purchased from Southern Ballistic Research and Tromix. Because this round has not been accepted as a SAAMI standard round brass for hand loading is exclusively produced by Starline. Loaded ammunition is also manufactured by Southern Ballistic Research, Cor-Bon, in addition to several smaller boutique loaders.

See also[edit]

References[edit]

External links[edit]

The website dedicated to the .458SOCOM, where load data and other info also available.


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/.458_SOCOM — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.

65 news items

Outdoor Channel

Outdoor Channel
Wed, 29 Jul 2015 14:50:15 -0700

Down Range Radio is a weekly podcast published every Wednesday morning and hosted by Michael Bane. We cover the latest from the firearms industry, the Second Amendment, shooting sports and personal defense. This is the audio version of ...

Guns.com

Guns.com
Wed, 17 Jun 2015 10:29:49 -0700

Lehigh Defense and Underwood Ammunition have teamed up on a pair of high-performance loads for .458 SOCOM shooters looking to get more out of their rifles. Although it's not a wildcat cartridge, .458 SOCOM is not an officially-specced round, but it has ...

AmmoLand Shooting Sports News

AmmoLand Shooting Sports News
Tue, 16 Jun 2015 15:07:30 -0700

USA –-(Ammoland.com)- Lehigh Defense teams up with Underwood Ammunition to offer one of the most exciting lines of 458 Socom ammunition on the market. Underwood Ammunition is known for their high performance ammunition. Their ammunition is ...

Guns.com

Guns.com
Sat, 22 Aug 2015 10:24:13 -0700

This allows the Unimag to reliably function with .223 Remington/5.56 NATO as well as .204 Ruger, .300 AAC Blackout, 5.45x39mm, 7.62x39mm, 6.5 Grendel, 6.8 Remington SPC and .458 SOCOM. It probably works with .50 Beowulf and plenty of other ...

Guns.com

Guns.com
Fri, 05 Dec 2014 11:14:35 -0800

You don't have to spend a lot to get a fine .458 SOCOM upper, either, not since Radical Firearms started offering a similar fully-assembled upper for just $469. Not bad for a complete upper, including a .458 bolt carrier group and custom muzzle brake.

Rifle Shooter Magazine

Rifle Shooter Magazine
Mon, 26 Aug 2013 08:01:44 -0700

When chambered for bigbore thumpers such as the .450 Bushmaster, .458 SOCOM or .50 Beowulf, the AR-15 is as effective a dangerous game-stalking tool as any other rifle ever devised. In such situations, there's a lot to be said for having a full ...

Hawaii Reporter

Hawaii Reporter
Thu, 22 Jan 2015 22:05:10 -0800

First up are the new HH762 (7.62 x 39) and HH458 (.458) SOCOM rifles from Headhunters Firearms, a Southern California based shop founded by Hawaii native John Nakagawa. (They are both available as complete rifles or, the uppers can be purchased ...

OutdoorHub

OutdoorHub
Wed, 13 May 2015 12:31:59 -0700

Some cartridges legal for deer hunting include the .357 Magnum, .38-.40 Winchester, .41 Magnum, .41 Special, .44 Magnum, .44 Special, .44-.40 Winchester, .45 Colt, .454 Casull, .458 SOCOM, .475 Linebaugh, .480 Ruger, .50 Action Express, .500 S&W, ...
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