Rifle · CIP
.30-284 Winchester
.30-284 Winchester is a rimless bottlenecked rifle cartridge of United States origin.
- Caliber
- 0.3091″ · 7.85 mm
- Introduced
- 1963
- Case
- Rebated
- Parent
- .284 Winchester
- Primary use
- Hunting
- Status
- Active
- Introduced
- 1963
- Type
- Rifle
- Origin
- United States
- Inventor
- Winchester
- Manufacturer
- Winchester Ammunition
- Standard
- CIP
- Status
- Active
- Availability
- Limited
- Case capacity
- 68.1 gr H₂O
- Twist (typical)
- 1:12.0
- Primer
- Large Rifle
- Case type
- Rebated
- Max pressure
- 55,114 psi, CIP transducer
- Eff. range
- 300 yd
- Max range
- 1500 yd
- Recoil
- 16.5–18 ft·lb
Introduced by Winchester Ammunition
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .30-284 Winchester, 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 ⌀ | 7.85 | 0.309 | ✓ |
| Neck ⌀ | 8.72 | 0.343 | ✓ |
| Shoulder ⌀ | 12.06 | 0.475 | ✓ |
| Shoulder angle | 35.1° | — | ≈ |
| Base ⌀ | 12.72 | 0.501 | ✓ |
| Rim ⌀ | 12.01 | 0.473 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.02 | 0.040 | ✓ |
| Neck length | 7.74 | 0.305 | ≈ |
| Case length | 55.10 | 2.169 | ✓ |
| Overall length | 72.00 | 2.835 | ✓ |
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. .30-284 Winchester 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
Developed by Winchester.
FAQs
- What twist rate does .30-284 Winchester use?
- .30-284 Winchester typically uses a 1:12.0 twist rate.
- What bullet diameter is .30-284 Winchester?
- .30-284 Winchester uses a 0.3091″ (7.85 mm) diameter bullet.
- Is .30-284 Winchester still in production?
- .30-284 Winchester is active; typical availability is limited.
- What is .30-284 Winchester used for?
- .30-284 Winchester is primarily used for hunting.
- What is .30-284 Winchester based on?
- .30-284 Winchester 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 →
