Lindcott Armory Rifle · Proprietary
.458 SOCOM
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
- Introduced
- 2001
- Type
- Rifle
- Origin
- United States
- Inventor
- Marty ter Weeme / Tony Rumore
- Manufacturer
- Teppo Jutsu LLC
- Standard
- Proprietary
- Status
- Active
- Availability
- Moderate
- Case capacity
- 62 gr H₂O
- Twist (typical)
- 1:14
- Primer
- Large Pistol
- Case type
- Rebated
- Max pressure
- 35,000 psi
- Eff. range
- 250 yd
- Max range
- 1500 yd
- Recoil
- 14–20 ft·lb
- Subsonic
- Capable
Ballistics
- By real loads
- 1,050–2,100 fps · 30 loads
- Parent case
- .50 AE
Representative trajectory — modeled from a single velocity input (no published BC for this cartridge yet).
Performance
Buy links open .458 SOCOM ammunition at Rivertown Munitions.
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| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 11.63 | 0.458 | ✓ |
| Neck ⌀ | 12.32 | 0.485 | ✓ |
| Shoulder ⌀ | 13.49 | 0.531 | ✓ |
| Shoulder angle | 25° | — | ✓ |
| Base ⌀ | 13.74 | 0.541 | ✓ |
| Rim ⌀ | 12.01 | 0.473 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.32 | 0.052 | ~ |
| Neck length | 8.98 | 0.354 | ≈ |
| Case length | 40.00 | 1.575 | ✓ |
| Overall length | 57.40 | 2.260 | ✓ |
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
In production — 30 active loads across 24 brands. Top 15 shown · see all 30 →.
| Brand | Load | Grain | Bullet | FPS | ft·lb | BC |
|---|---|---|---|---|---|---|
| Liberty Defense | Civil Defense | 200 | HP | 2,250 | 2,248 | — |
| G2 Research | RIP | 200 | RIP | 2,100 | 1,958 | — |
| Inceptor | ARX | 200 | ARX | 2,100 | 1,958 | — |
| Polycase | ARX | 250 | ARX | 1,950 | 2,110 | — |
| Cutting Edge Bullets | Rapter | 280 | FBHP | 1,950 | 2,364 | — |
| Underwood | Controlled Chaos | 300 | CC HP | 1,950 | 2,533 | — |
| Nosler | Trophy Grade | 300 | AccuBond | 1,950 | 2,533 | — |
| Lehigh Defense | Maximum Expansion | 250 | Max Expansion | 1,940 | 2,089 | — |
| True Velocity | Composite Case FMJ | 300 | FMJ | 1,900 | 2,404 | — |
| Cor-Bon | DPX | 300 | Barnes XPB | 1,900 | 2,404 | — |
| Fort Scott Munitions | TUI | 300 | SCV | 1,900 | 2,404 | — |
| Hornady | Custom | 300 | XTP HP | 1,900 | 2,404 | — |
| Barnes | VOR-TX TSX | 300 | TSX | 1,900 | 2,404 | — |
| Barnes | VOR-TX | 300 | TTSX FB | 1,900 | 2,404 | — |
| Big Horn Armory | Hunter | 325 | SST | 1,900 | 2,605 | — |
Velocities are manufacturer-stated (test-barrel). Discontinued loads dimmed.
Suitable powders
5 reloading powders listed for .458 SOCOM, fastest to slowest. Cross-reference in the finder →
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
12 models in the database chamber .458 SOCOM. Browse all →
Lineage
Connected reference
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 →