Rifle · Not SAAMI standardized · Not standardizedObsolete
.458x2" American
.458x2" American is a belted straight-walled rifle cartridge of United States origin.
- Caliber
- 0.458″ · 11.633 mm
- Introduced
- 1962
- Case
- Belted
- Parent
- .458 Winchester Magnum
- Primary use
- Hunting
- Status
- Discontinued
- Obsolete
- Obsolete
- Introduced
- 1962
- Type
- Rifle
- Origin
- United States
- Inventor
- Frank C. Barnes
- Manufacturer
- None (wildcat; designed by Frank C. Barnes)
- Standard
- Not SAAMI standardized · Not standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Discontinued
- Availability
- Rare
- Case capacity
- 74 gr H₂O
- Twist (typical)
- 1:16
- Primer
- Large Rifle Magnum
- Case type
- Belted
- Max pressure
- 60,000 psi, SAAMI transducer
- Eff. range
- 250 yd
- Max range
- 1250 yd
- Recoil
- 16.8–26.5 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .458x2" American, so this is the shape gravity alone gives the advertised velocity. Drag would steepen it. The tool below solves real loads through their published G1 or G7 model.
Open in Ballistic Compare- Parent case
- .458 Winchester Magnum
Representative trajectory — modeled from a single velocity input (no published BC for this cartridge yet).
Dimensionscase measurements · scale drawing · size vs familiar rounds
Case dimensions — the scale drawing at the top of the page is built from these.
Wikipedia · secondary source| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 11.63 | 0.458 | · |
| Neck ⌀ | 12.22 | 0.481 | · |
| Shoulder ⌀ | n/a | ||
| Shoulder angle | n/a | ||
| Base ⌀ | 13.03 | 0.513 | · |
| Rim ⌀ | 13.51 | 0.532 | · |
| Belt ⌀ | 13.51 | 0.532 | |
| Rim thickness | 1.27 | 0.050 | · |
| Neck length | n/a | ||
| Case length | 50.80 | 2.000 | · |
| Overall length | 66.04 | 2.600 | |
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. .458x2" American is highlighted below.
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.
Lineage
Connected reference
History
Introduced around 1962 by Frank Barnes, derived from the .458 Winchester Magnum.
FAQs
- What twist rate does .458x2" American use?
- .458x2" American typically uses a 1:16 twist rate.
- What bullet diameter is .458x2" American?
- .458x2" American uses a 0.458″ (11.633 mm) diameter bullet.
- Is .458x2" American still in production?
- .458x2" American is discontinued; typical availability is rare.
- What is .458x2" American used for?
- .458x2" American is primarily used for hunting.
- What is .458x2" American based on?
- .458x2" American is derived from the .458 Winchester Magnum case.
Sources & provenance
Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
