Lindcott Armory Rifle · Wildcat
.510 Whisper
A wildcat cartridge developed by J.D.
- Caliber
- 0.51″ · 12.954 mm
- Introduced
- 1992
- Case
- Rimless
- Parent
- .338 Lapua Magnum
- Primary use
- Specialty, Self Defense, Hunting
- Status
- Limited
- Introduced
- 1992
- Type
- Rifle
- Origin
- United States
- Inventor
- J.D. Jones / SSK Industries
- Standard
- Wildcat
- Status
- Limited
- Availability
- Handload Only
- Primer
- Large Rifle
- Case type
- Rimless
- Max pressure
- 50,038 psi
- Eff. range
- 150 yd
- Max range
- 300 yd
- Subsonic
- Capable
Ballistics
- Parent case
- .338 Lapua 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.
CIP TDCC · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 12.95 | 0.510 | · |
| Neck ⌀ | 13.95 | 0.549 | · |
| Shoulder ⌀ | 14.91 | 0.587 | · |
| Shoulder angle | 83° | — | ~ |
| Base ⌀ | 14.91 | 0.587 | · |
| Rim ⌀ | 14.94 | 0.588 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.52 | 0.060 | ~ |
| Neck length | — | — | |
| Case length | 47.37 | 1.865 | · |
| Overall length | 84.84 | 3.340 | · |
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. .510 Whisper is highlighted below.
Missing a dimension for .510 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
J.D. Jones developed the Whisper cartridge family at SSK Industries beginning in the late 1980s to maximize suppressor effectiveness by keeping projectiles subsonic. The .510 Whisper is the large-bore flagship of the family. Jones also created the .300 Whisper, which became the commercial .300 Blackout. The Whisper series directly influenced the modern subsonic rifle cartridge movement.
FAQs
- What bullet diameter is .510 Whisper?
- .510 Whisper uses a 0.51″ (12.954 mm) diameter bullet.
- Is .510 Whisper still in production?
- .510 Whisper is limited; typical availability is handload only.
- What is .510 Whisper used for?
- .510 Whisper is primarily used for specialty, self defense, hunting.
- What is .510 Whisper based on?
- .510 Whisper is derived from the .416 Rigby case.
Sources & provenance
- StandardC.I.P. — C.I.P. TDCC — Tables of Dimensions of Cartridges and Chambers
- Secondary.510 Whisper — Wikipedia · parent_cartridge
- Secondary510 Whisper wildcat — CollectibleAmmunition.com (norma .338 Lapua Mag) · parent_cartridge
Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →