Handgun
.338 JDJ No. 2
One of J.D.
- Caliber
- 0.338″ · 8.585 mm
- Case
- Bottleneck
- Status
- Wildcat
- Type
- Handgun
- Status
- Wildcat
- Availability
- Rare
- Primer
- Large Rifle
- Eff. range
- 200 yd
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
- —
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.
Connected reference
History
One of J.D. Joness SSK big-bore Contender wildcats, throwing .338 bullets for handgun hunting.
FAQs
- 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.
Sources & provenance
- Manufacturer Hornady Manufacturing — Handgun Data — 338 JDJ #2 (Obsolete Load Data) · bullet ⌀, velocity, grain weights 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 →