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Lindcott Armory

Rifle · Proprietary

.458 SOCOM

Also known as .458 SOCOM · 11.6x40mm

Big-bore AR-15 cartridge developed at request of US Special Operations Command.

Caliber
0.458″ · 11.633 mm
Introduced
2001
Case
Rebated
Parent
.50 AE
Primary use
Military, Hunting, Self Defense
Status
Active

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VelocityBeing verified
EnergyBeing verified
Typical grains200 · 250 · 300 gr
Identity
Introduced
2001
Type
Rifle
Origin
United States
Inventor
Marty ter Weeme / Tony Rumore
Manufacturer
Teppo Jutsu LLC
Standard
Proprietary
Status
Active
Availability
Moderate
Build
Case capacity
62 gr H₂O
Twist (typical)
1:14
Primer
Large Pistol
Case type
Rebated
Pressure & range
Max pressure
35,000 psi
Eff. range
250 yd
Max range
1500 yd
Recoil
14–20 ft·lb
Subsonic
Capable

Ballistics

Published velocity/energy data isn't available for .458 SOCOM. Parent case: .50 AE.

Performance

Best for Withheld until verified
Best for Withheld until verified
Dimensionscase measurements · scale drawing · size vs familiar rounds

Case dimensions — the scale drawing at the top of the page is built from these.

SAAMI · verified
Measuremmin✓
Bullet ⌀ 11.630.458 ✓
Neck ⌀ 12.320.485 ✓
Shoulder ⌀ 13.490.531 ✓
Shoulder angle 25°— ✓
Base ⌀ 13.740.541 ✓
Rim ⌀ 12.010.473 ✓
Belt ⌀ n/a
Rim thickness 1.320.052 ~
Neck length 8.980.354 ≈
Case length 40.001.575 ✓
Overall length 57.402.260 ✓

Size vs familiar rounds

Drawn at true 1:1 — every case is accurate relative to the others. Absolute size depends on your screen's pixel density, so measuring one against a real ruler may be off. .458 SOCOM is highlighted below.

Factory loads

Verification

Being verified

Advertised FPS, energy, and BC are withheld until loads clear verification.

Suitable powders

5 reloading powders listed for .458 SOCOM, fastest to slowest. Cross-reference in the finder →

Lil'GunIMR 4227CFE BLKReloader 7H335
Reloading costestimate cost per round vs factory

Estimate your cost per round and how it compares to factory. Inputs are yours — nothing is stored.

Cost estimate only — not load data. Charge weight is your input; follow published manuals for safe charges.

Firearms chambered in .458 SOCOM

7 models in the database chamber .458 SOCOM. Browse all →

Big Horn Armory AR500 .500 Auto MaxRadical Firearms RF-15 458 SOCOM 16-inchBear Creek Arsenal BC-15 458 SOCOM 16-inchCMMG MK47 Mutant .458 SOCOM 16-inchMaxim Defense PDX 5.56 AR PistolRadical Firearms 458 SOCOM 16-inchTactical Solutions TSAR 300 .458 SOCOM 16-inch

Lineage

Immediate parent
.50 AE
Family TreeOpen .458 SOCOM in the interactive cartridge family tree

Connected reference

Loads30 factory loads for .458 SOCOMReloading5 suitable powders — cross-referenceFirearmsFirearms in .458 SOCOM

History

Developed in 2001 at the request of US Special Operations Command who wanted more stopping power than 5.56mm for close quarters battle. Designed to fit AR-15 platform with minimal modifications. Uses standard AR bolt face. Can load 10 rounds in standard 30-round magazine. Popular for hog hunting, dangerous game backup, and home defense. Competes with .50 Beowulf and .450 Bushmaster.

FAQs

What twist rate does .458 SOCOM use?
.458 SOCOM typically uses a 1:14 twist rate.
What bullet diameter is .458 SOCOM?
.458 SOCOM uses a 0.458″ (11.633 mm) diameter bullet.
Is .458 SOCOM still in production?
.458 SOCOM is active; typical availability is moderate.
What is .458 SOCOM used for?
.458 SOCOM is primarily used for military, hunting, self defense.
What is .458 SOCOM based on?
.458 SOCOM is derived from the .50 AE case.
What are the best powders for .458 SOCOM?
Reloading powders commonly listed for .458 SOCOM include Lil'Gun, IMR 4227, CFE BLK, Reloader 7, among 5 suitable options.

Sources & provenance

Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 30 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →