digplanet beta 1: Athena
Share digplanet:


Applied sciences






















.458 SOCOM
55gr 5.56 NATO vs 500gr .458 SOCOM
Type Rifle
Place of origin United States
Production history
Designer Teppo Jutsu LLC
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]


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, Tromix, 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]


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.
5476 videos foundNext > 

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 destruction! I found a few things lying around I was curious to shoot with my .458 SOCOM AR-15, this was mostly due to the lack of vids available ...

.458 SOCOM FULL AUTO M16 vs .223/5.56mm

Full Auto .458 SOCOM!!! http://http://www.facebook.com/topshotdustin http://www.twitter.com/topshotdustin http://www.topshotdustin.com.

.458 SOCOM AR-15 "HOGZILLA" -Interview + Shooting

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...

Reloading .458 Socom With KAK INDUSTRY Brass Projectiles

Reloading for the .458 socom using brass projectiles "bullets" from KAK INDUSTRY.There made in house.Also in a future video I will be doing some accuracy tes...

.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...

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 500gr Subsonic-KAK INDUSTRY

Shooting .458 socom 500gr subsonic with chrono at the range. And some extra blasting at the end of video...Be sure to to check out KAK Industry. http://www.k...

.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...

KAK Industry 458 Socom AR15 ammo testing continued

Kurt and Brian continue their testing of ammo on the KAK Industry 458 Socom.. 8.0 and 16.0 with super sonic and sub sonic ammo. Be sure to check out my other...

5476 videos foundNext > 

48 news items


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.
Bearing Arms
Sat, 22 Nov 2014 08:24:33 -0800

These 300 grain, .458-cailber bullets provide some of the most impressive ballistic performance I've seen. The bullet's four machined almost half-inch long petals separated as designed and carved their own wound channels, and the base penetrated the ...


Thu, 04 Dec 2014 08:41:15 -0800

Layke's Operations Manager, Dan Schulze encourages customers to bring your unique build ideas, “we are building three right now, a 6.5 Grendel and 458 Socom rifle and pistol”. Layke Tactical Announces CUSTOM BUILD SHOP. This video is private.
Digital Journal
Wed, 26 Nov 2014 22:33:45 -0800

BuyGunsAndAmmo.com offers a wide-range of calibers, including Liberty Ammunition 9mm, .45 ACP and .380 ACP, Inceptor ARX 9mm and .380 ACP, and SBR 9mm subsonic, .40 S&W subsonic, .38 Special, .338 Spectre, and .458 SOCOM. In addition to ...

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 ...

Just Jared

Just Jared
Tue, 29 Jul 2014 12:33:34 -0700

Zac Efron opened up about being young and famous and his stint in rehab while on Running Wild with Bear Grylls. “The challenging part was never the work…it was sort of the in-between work. The socials aspects. Everywhere you go to an extent there is ...

Guns Magazine

Guns Magazine
Mon, 13 Oct 2014 10:03:45 -0700

For some calibers, simply change the bolt and barrel on this weapon and the shooter will be able to fire multiple calibers, including .223/5.56, 6.5 Grendel, 6.8 SPC, .450 Thumper and the .458 SOCOM. There is no more versatile weapon on the planet, and ...

Rifle Shooter Magazine

Rifle Shooter Magazine
Wed, 08 Oct 2014 09:30:00 -0700

FOF-Bolt_vs_Double_(3)_F Double rifle enthusiasts prefer these guns for dangerous game because they offer faster follow-up shots than bolt guns. Is that true? For years, writers and professional hunters have touted the use of double rifles for ...

Oops, we seem to be having trouble contacting Twitter

Support Wikipedia

A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia. Please add your support for Wikipedia!

Searchlight Group

Digplanet also receives support from Searchlight Group. Visit Searchlight