Rifle · CIP
.300 Pegasus
.300 Pegasus is a rimless bottlenecked rifle cartridge of United States origin.
- Caliber
- 0.3079″ · 7.82 mm
- Introduced
- 1994
- Case
- Rimless
- Primary use
- Hunting
- Status
- Active
- Introduced
- 1994
- Type
- Rifle
- Origin
- United States
- Inventor
- Arthur Alphin (A-Square)
- Manufacturer
- A-Square
- Standard
- CIP
- Status
- Active
- Availability
- Limited
- Case capacity
- 130.1 gr H₂O
- Twist (typical)
- 1:10.0
- Primer
- Large Rifle Magnum
- Case type
- Rimless
- Max pressure
- 62,366 psi, CIP transducer
- Eff. range
- 400 yd
- Max range
- 2000 yd
- Recoil
- 32.8–37.9 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .300 Pegasus, 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.
CIP TDCC · verified| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 7.82 | 0.308 | ✓ |
| Neck ⌀ | 8.61 | 0.339 | ✓ |
| Shoulder ⌀ | 14.38 | 0.566 | ✓ |
| Shoulder angle | 28° | — | ≈ |
| Base ⌀ | 14.73 | 0.580 | ✓ |
| Rim ⌀ | 14.73 | 0.580 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.65 | 0.065 | ✓ |
| Neck length | 8.29 | 0.326 | ≈ |
| Case length | 75.95 | 2.990 | ✓ |
| Overall length | 95.25 | 3.750 | ✓ |
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. .300 Pegasus 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
Introduced around 1994.
FAQs
- What twist rate does .300 Pegasus use?
- .300 Pegasus typically uses a 1:10.0 twist rate.
- What bullet diameter is .300 Pegasus?
- .300 Pegasus uses a 0.3079″ (7.82 mm) diameter bullet.
- Is .300 Pegasus still in production?
- .300 Pegasus is active; typical availability is limited.
- What is .300 Pegasus used for?
- .300 Pegasus is primarily used for hunting.
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 →
