Rifle · CIP
.284 Shehane
.284 Shehane is a rimless bottlenecked rifle cartridge of United States origin.
- Caliber
- 0.2839″ · 7.21 mm
- Introduced
- 2020
- Case
- Rebated
- Parent
- .284 Winchester
- Primary use
- Hunting
- Status
- Active
- Introduced
- 2020
- Type
- Rifle
- Origin
- United States
- Inventor
- Bill Shehane
- Manufacturer
- Bill Shehane
- Standard
- CIP
- Status
- Active
- Availability
- Limited
- Case capacity
- 67.8 gr H₂O
- Twist (typical)
- 1:9.0
- Primer
- Large Rifle
- Case type
- Rebated
- Max pressure
- 63,817 psi, CIP transducer
- Eff. range
- 400 yd
- Max range
- 2000 yd
- Recoil
- 16.5–18.5 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .284 Shehane, 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
- .284 Winchester
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 · verified| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 7.21 | 0.284 | ✓ |
| Neck ⌀ | 7.90 | 0.311 | ✓ |
| Shoulder ⌀ | 12.29 | 0.484 | ✓ |
| Shoulder angle | 35° | — | ≈ |
| Base ⌀ | 12.69 | 0.500 | ✓ |
| Rim ⌀ | 12.01 | 0.473 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.37 | 0.054 | ✓ |
| Neck length | 6.97 | 0.274 | ≈ |
| Case length | 54.87 | 2.160 | ✓ |
| Overall length | 78.00 | 3.071 | ✓ |
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. .284 Shehane 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
Introduced around 2020.
FAQs
- What twist rate does .284 Shehane use?
- .284 Shehane typically uses a 1:9.0 twist rate.
- What bullet diameter is .284 Shehane?
- .284 Shehane uses a 0.2839″ (7.21 mm) diameter bullet.
- Is .284 Shehane still in production?
- .284 Shehane is active; typical availability is limited.
- What is .284 Shehane used for?
- .284 Shehane is primarily used for hunting.
- What is .284 Shehane based on?
- .284 Shehane is derived from the .284 Winchester 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 →
