What twist rate does .240 Weatherby Magnum use?

.240 Weatherby Magnum typically uses a 1:10 twist rate.

What bullet diameter is .240 Weatherby Magnum?

.240 Weatherby Magnum uses a 0.2429″ (6.17 mm) diameter bullet.

Is .240 Weatherby Magnum still in production?

.240 Weatherby Magnum is active; typical availability is specialty.

What is .240 Weatherby Magnum used for?

.240 Weatherby Magnum is primarily used for hunting, target.

What is .240 Weatherby Magnum based on?

.240 Weatherby Magnum is derived from the .300 H&H Magnum case.

What are the best powders for .240 Weatherby Magnum?

Reloading powders commonly listed for .240 Weatherby Magnum include N550, URP, Reloader 17, Norma 204, among 10 suitable options.

Lindcott Armory

Rifle · SAAMI

.240 Weatherby Magnum

Also known as .240 Wby Mag

Roy Weatherby's .24-caliber entry — the fastest commercial .243-bore cartridge ever produced.

Caliber: 0.2429″ · 6.17 mm
Introduced: 1968
Case: Belted
Parent: .300 H&H Magnum
Primary use: Hunting, Target
Status: Active

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VelocityBeing verified

EnergyBeing verified

Typical grains85 · 90 · 100 gr

Identity

Introduced: 1968
Type: Rifle
Origin: United States
Inventor: Roy Weatherby
Manufacturer: Weatherby
Standard: SAAMI
Status: Active
Availability: Specialty

Build

Case capacity: 72 gr H₂O
Twist (typical): 1:10
Primer: Large Rifle Magnum
Case type: Belted

Pressure & range

Max pressure: 65,000 psi
Eff. range: 400 yd
Max range: 800 yd
Recoil: 12–18 ft·lb

Introduced by Weatherby

Ballistics

Published velocity/energy data isn't available for .240 Weatherby Magnum. Parent case: .300 H&H Magnum.

Performance

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.

CIP TDCC · approximate

Measure	mm	in	✓
Bullet ⌀	6.17	0.243	·
Neck ⌀	6.79	0.267	~
Shoulder ⌀	10.88	0.428	·
Shoulder angle	—	—
Base ⌀	11.38	0.448	~
Rim ⌀	11.93	0.470	·
Belt ⌀	11.93	0.470	~
Rim thickness	1.19	0.047	~
Neck length	8.78	0.346	≈
Case length	63.40	2.496	·
Overall length	78.74	3.100	·

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. .240 Weatherby Magnum is highlighted below.

Missing a dimension for .240 Weatherby Magnum? Some case measurements aren't in a published SAAMI/CIP drawing yet. Have a factory or reamer print? Send it → — verified hard-to-find data earns a free Lindcott sticker.

Factory loads

Verification

Being verified

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

Suitable powders

10 reloading powders listed for .240 Weatherby Magnum, 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.

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.

Firearms chambered in .240 Weatherby Magnum

12 models in the database chamber .240 Weatherby Magnum. Browse all →

Weatherby Mark V Backcountry 240 Wby MagWeatherby Mark V Outfitter 240 Wby MagWeatherby Mark V Terramark 240 Wby MagWeatherby Vanguard Series 2 .240 Wby MagWeatherby Mark V Ultralight 240 Wby MagWeatherby Mark V Ultra Lightweight .270 WinWeatherby Mark V Ultra Lightweight .270 Wby MagWeatherby Mark V Ultra Lightweight .243 WinWeatherby Mark V Ultra Lightweight .257 Wby MagWeatherby Mark V Ultra Lightweight .240 Wby MagWeatherby Mark V Ultra LightweightWeatherby Mark V Accumark

Lineage

Family TreeOpen .240 Weatherby Magnum in the interactive cartridge family tree

Connected reference

Loads21 factory loads for .240 Weatherby Magnum Reloading10 suitable powders — cross-reference FirearmsFirearms in .240 Weatherby Magnum

History

Introduced in 1968 on Weatherby's belted magnum case. Roy Weatherby applied his maximum-velocity philosophy to the .24 caliber, producing a cartridge that significantly outperforms .243 Winchester and 6mm Remington. The .240 Weatherby is the only Weatherby cartridge based on a shortened .30-06 length case rather than the full Weatherby magnum case, giving it a slightly more manageable recoil profile than other Weatherby magnums. It found a following among open-country hunters pursuing antelope, deer, and mule deer at long distances where trajectory matters. Weatherby still chambers the Mark V in .240 and produces factory ammunition.

FAQs

What twist rate does .240 Weatherby Magnum use?: .240 Weatherby Magnum typically uses a 1:10 twist rate.
What bullet diameter is .240 Weatherby Magnum?: .240 Weatherby Magnum uses a 0.2429″ (6.17 mm) diameter bullet.
Is .240 Weatherby Magnum still in production?: .240 Weatherby Magnum is active; typical availability is specialty.
What is .240 Weatherby Magnum used for?: .240 Weatherby Magnum is primarily used for hunting, target.
What is .240 Weatherby Magnum based on?: .240 Weatherby Magnum is derived from the .300 H&H Magnum case.
What are the best powders for .240 Weatherby Magnum?: Reloading powders commonly listed for .240 Weatherby Magnum include N550, URP, Reloader 17, Norma 204, among 10 suitable options.

Sources & provenance

Standard SAAMI — SAAMI cartridge & chamber drawing — .240 Weatherby Magnum archived
Standard C.I.P. — C.I.P. TDCC — Tables of Dimensions of Cartridges and Chambers
Manufacturer Weatherby, Inc. — 240 Weatherby Magnum — ammunition product page · grain_ballistics, representative_gun archived
Manufacturer Weatherby, Inc. — Weatherby Ballistics Specifications Chart (PDF) · grain_ballistics, representative_gun

Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 21 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →