Rifle · Not SAAMI standardized · Not standardizedObsolete
.338 Whisper
.338 Whisper is a rimless bottlenecked rifle cartridge of United States origin.
- Caliber
- 0.3382″ · 8.59 mm
- Introduced
- 1990
- Case
- Rimless
- Parent
- 7mm BR Remington
- Primary use
- Hunting
- Status
- Discontinued
- Obsolete
- Obsolete
- Introduced
- 1990
- Type
- Rifle
- Origin
- United States
- Inventor
- J.D. Jones
- Manufacturer
- SSK Industries
- Standard
- Not SAAMI standardized · Not standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Discontinued
- Availability
- Rare
- Case capacity
- 36.6 gr H₂O
- Twist (typical)
- 1:10
- Primer
- Large Rifle
- Case type
- Rimless
- Max pressure
- 38,000 psi, SAAMI transducer
- Eff. range
- 150 yd
- Max range
- 750 yd
- Recoil
- 5.2–5.5 ft·lb
- Subsonic
- Capable
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .338 Whisper, 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
- 7mm BR Remington
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 · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 8.59 | 0.338 | · |
| Neck ⌀ | 9.11 | 0.359 | · |
| Shoulder ⌀ | 11.60 | 0.457 | · |
| Shoulder angle | 23° | — | |
| Base ⌀ | 11.83 | 0.466 | · |
| Rim ⌀ | 11.91 | 0.469 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.20 | 0.047 | · |
| Neck length | 5.14 | 0.202 | |
| Case length | 38.08 | 1.499 | · |
| Overall length | 67.51 | 2.658 | · |
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. .338 Whisper is highlighted below.
Missing a dimension for .338 Whisper? 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.
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 1990 by J.D. Jones, derived from the 7mm BR Remington.
FAQs
- What twist rate does .338 Whisper use?
- .338 Whisper typically uses a 1:10 twist rate.
- What bullet diameter is .338 Whisper?
- .338 Whisper uses a 0.3382″ (8.59 mm) diameter bullet.
- Is .338 Whisper still in production?
- .338 Whisper is discontinued; typical availability is rare.
- What is .338 Whisper used for?
- .338 Whisper is primarily used for hunting.
- What is .338 Whisper based on?
- .338 Whisper is derived from the 7mm BR Remington 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 →
