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.333 OKH is obsolete; typical availability is collector.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.

Lindcott Armory

Wildcat · Wildcat

.333 OKH

Also known as 333 O'Neil-Keith-Hopkins · .333 O.K.H.

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Status: Obsolete

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Velocity2,400 fps

Energy3,836 ft·lb · est.

Identity

Introduced: 1945
Type: Wildcat
Origin: United States
Inventor: Charlie O'Neil, Elmer Keith and Don Hopkins
Standard: Wildcat
Status: Obsolete
Availability: Collector

Build

Primer: Large Rifle
Case type: Rimless

Pressure & range

Eff. range: 250 yd

Ballistics

Representative trajectory · velocity only, no drag model · 100 yd zero0–800 yd

Drop Zero

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.

Powder $/lb Charge (gr) Bullet $/ea Primer $/ea Brass reuses Brass $/ea

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

Lineage

Family TreeOpen .333 OKH in the interactive cartridge family tree

Connected reference

FirearmsFirearms in .333 OKH ToolCompare ballistics

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 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) · bullet ⌀, grain weights, velocity
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 →