Handgun · Wildcat
.338 JDJ No. 2
One of J.D.
- Caliber
- 0.338″ · 8.585 mm
- Introduced
- 1980
- Case
- Rimmed
- Parent
- .444 Marlin
- Primary use
- Hunting
- Status
- Wildcat
- Introduced
- 1980
- Type
- Handgun
- Origin
- United States
- Inventor
- J.D. Jones (SSK Industries)
- Manufacturer
- SSK Industries
- Standard
- Wildcat
- Status
- Wildcat
- Availability
- Rare
- Case capacity
- 63.6 gr H₂O
- Twist (typical)
- 1:16
- Primer
- Large Rifle
- Case type
- Rimmed
- Max pressure
- 23,000 psi, SAAMI transducer
- Eff. range
- 200 yd
- Max range
- 4550 yd
- Recoil
- 18.7–21.8 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .338 JDJ No. 2, 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
- .444 Marlin
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.
reloading data · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 8.59 | 0.338 | ✓ |
| Neck ⌀ | 9.20 | 0.362 | ✓ |
| Shoulder ⌀ | 11.53 | 0.454 | ✓ |
| Shoulder angle | 25° | — | ~ |
| Base ⌀ | 11.94 | 0.470 | ✓ |
| Rim ⌀ | 13.06 | 0.514 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.60 | 0.063 | ✓ |
| Neck length | 8.54 | 0.336 | ≈ |
| Case length | 56.52 | 2.225 | ✓ |
| Overall length | 75.57 | 2.975 | ✓ |
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 JDJ No. 2 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
The .338 JDJ No. 2 is a bottleneck rimmed handgun cartridge.
FAQs
- What twist rate does .338 JDJ No. 2 use?
- .338 JDJ No. 2 typically uses a 1:16 twist rate.
- What bullet diameter is .338 JDJ No. 2?
- .338 JDJ No. 2 uses a 0.338″ (8.585 mm) diameter bullet.
- Is .338 JDJ No. 2 still in production?
- .338 JDJ No. 2 is wildcat; typical availability is rare.
- What is .338 JDJ No. 2 used for?
- .338 JDJ No. 2 is primarily used for hunting.
- What is .338 JDJ No. 2 based on?
- .338 JDJ No. 2 is derived from the .444 Marlin case.
Sources & provenance
- Manufacturer Hornady — Handgun Data — 338 JDJ #2 (Obsolete Load Data) · velocity, grain weights, bullet ⌀ archived
- Reference DBI Books (Frank C. Barnes) — Cartridges of the World, 8th ed. — proprietary/JDJ cartridges chapter · bullet ⌀
Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
