Wildcat · Wildcat · Not SAAMI standardized · Not standardizedObsolete
.333 OKH
Influential American .30-06-based medium-bore wildcat associated with Elmer Keith (rimless .333 OKH)..
- Caliber
- 0.3331″ · 8.46 mm
- Introduced
- 1945
- Case
- Rimless
- Parent
- .30-06 Springfield
- Primary use
- Hunting
- Status
- Obsolete
- Obsolete
- Obsolete
- Introduced
- 1945
- Type
- Wildcat
- Origin
- United States
- Inventor
- Charlie O'Neil, Elmer Keith and Don Hopkins
- Manufacturer
- Handloaded only (wildcat; no factory ammunition)
- Standard
- Wildcat · Not SAAMI standardized · Not standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Obsolete
- Availability
- Collector
- Case capacity
- 68.4 gr H₂O
- Twist (typical)
- 1:10
- Primer
- Large Rifle
- Case type
- Rimless
- Max pressure
- 31,900 psi, SAAMI transducer
- Eff. range
- 250 yd
- Max range
- 5350 yd
- Recoil
- 43.1–56.4 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .333 OKH, 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
- .30-06 Springfield
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.
SAAMI · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 8.46 | 0.333 | · |
| Neck ⌀ | 9.09 | 0.358 | · |
| Shoulder ⌀ | 11.20 | 0.441 | · |
| Shoulder angle | 16.3° | — | ~ |
| Base ⌀ | 11.96 | 0.471 | · |
| Rim ⌀ | 12.01 | 0.473 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.24 | 0.049 | · |
| Neck length | 8.89 | 0.350 | ≈ |
| Case length | 61.98 | 2.440 | ~ |
| Overall length | 85.60 | 3.370 | · |
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. .333 OKH 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
Charlie O'Neil, Elmer Keith and Don Hopkins, ~1945; conceptual forerunner of the .338 Win Mag / .338-06. Distinct from the belted .334 OKH.
FAQs
- What twist rate does .333 OKH use?
- .333 OKH typically uses a 1:10 twist rate.
- What bullet diameter is .333 OKH?
- .333 OKH uses a 0.3331″ (8.46 mm) diameter bullet.
- Is .333 OKH still in production?
- .333 OKH is obsolete; typical availability is collector.
- What is .333 OKH used for?
- .333 OKH is primarily used for hunting.
- What is .333 OKH based on?
- .333 OKH is derived from the .30-06 Springfield case.
Sources & provenance
- Reference Gun Digest / Krause (F+W Media) — Cartridges of the World — Wildcat/.333 OKH section (also documented in Ackley's Handbook) · velocity, grain weights, bullet ⌀
- Secondary NRA / American Rifleman — Wildcat Cartridges That Went Legit · bullet ⌀, year archived
Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
