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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 relatively 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 M43, 9x39mm 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" 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 nine .458 SOCOM rounds.

Today, .458 SOCOM rifles and complete upper halves are available from Rock River Arms, Disappear Gear, and Wilson Combat, although the latter does not use designer-approved reamers that meet the dimensions of the SAAMI application. Barrels and bolts can be purchased from Southern Ballistic Research and Tromix. Brass for hand loading is exclusively produced by Starline. Loaded ammunition is also manufactured by Southern Ballistic Research, Wilson Combat and 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.
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AR15 .458 SOCOM Zombie Killer "HOGZILLA" (ultra SLOMO!)

This .458 SOCOM is pretty basic, but packs a huge punch shooting .458 cal 320 grain rounds at about 1800 fps. Not a real well-known round currently- unless y...

458 SOCOM TEST

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This is just a follow up video to explain more about the .458 SOCOM round. We did a non-scientific comparison of the hitting power between this round and a 7...

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458 SOCOM MidLength

I finally got my 458 SOCOM and I know the sights are straight on this one! The best thing is that I can use all the bullets for my 45-70 in this. This is my ...

.458 SOCOM - Turning Cover Into Concealment(TM)

A brief video showing the applicability and flexibility of the AR-15 when combined with the .458 SOCOM upper conversion. The video is intended to be entertai...

AR15.458 Socom Pistol-Shooting KAK INDUSTRY

Range video of my AR15.458 socom pistol.I has a KAK INDUSTRY 8 inch barrel upper.Also I will be chrono testing load data and ringing some steel..Here is a li...

Rock River Arms .458 SOCOM Beast, SHOT Show 2014

Dustin Ellermann takes a close look at the new .458 SOCOM Beast AR from Rock River Arms.

.458 SOCOM Watermelon Obliteration

A little ballistic testing for Texas Fish and Game Magazine. .223 vs .458 SOCOM. The SOCOM completely obliterated the watermelon, and passed through 2 blocks...

.458 SOCOM "Hogzilla" Taofledermaus on Sons of Guns

A couple months ago I was approached by the producers of Discovery's "Son of Guns" tv show about using some of my Youtube footage in an upcoming episode. It ...

6220 videos foundNext > 

1 news items

 
North Platte Telegraph
Fri, 29 Aug 2014 01:12:28 -0700

A few of the bigger calibers out there for an AR platform are the .450 Bushmaster, the .458 SOCOM and the .50 Beowolf. If you have something big, mean, hairy with teeth bearing down on you, any of these rifles could stop it. The .5.56/.223 ... maybe not.
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