Rifle · SAAMI · SAAMI standardized · CIP standardizedObsolete
.300 Ruger Compact Magnum
Short-action, beltless .30-caliber magnum jointly developed by Hornady and Ruger..
- Caliber
- 0.3079″ · 7.82 mm
- Introduced
- 2007
- Case
- Rimless
- Parent
- .375 Ruger
- Primary use
- Hunting
- Status
- Discontinued
- Obsolete
- Obsolete
- Introduced
- 2007
- Type
- Rifle
- Origin
- United States
- Inventor
- Hornady and Ruger
- Manufacturer
- Hornady / Ruger
- Standard
- SAAMI · SAAMI standardized · CIP standardized
- SAAMI
- SAAMI standardized
- Obsolete
- Obsolete
- Status
- Discontinued
- Availability
- Limited
- Case capacity
- 75 gr H₂O
- Twist (typical)
- 1:10
- Primer
- Large Rifle Magnum
- Case type
- Rimless
- Max pressure
- 65,000 psi, SAAMI transducer
- Eff. range
- 500 yd
- Max range
- 4600 yd
- Recoil
- 24.4–26.2 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .300 Ruger Compact Magnum, 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
- .375 Ruger
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 ⌀ | 8.64 | 0.340 | ✓ |
| Shoulder ⌀ | 13.08 | 0.515 | ✓ |
| Shoulder angle | 30° | — | ✓ |
| Base ⌀ | 13.51 | 0.532 | ✓ |
| Rim ⌀ | 13.51 | 0.532 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.27 | 0.050 | ✓ |
| Neck length | 7.76 | 0.306 | ≈ |
| Case length | 53.34 | 2.100 | ✓ |
| Overall length | 72.14 | 2.840 | ✓ |
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 Ruger Compact Magnum 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.
Firearms chambered in .300 Ruger Compact Magnum
Lineage
Connected reference
History
Introduced 2008 with the Ruger Hawkeye; the .30-cal member of the Ruger Compact Magnum family. SAAMI MAP 65,000 psi.
FAQs
- What twist rate does .300 Ruger Compact Magnum use?
- .300 Ruger Compact Magnum typically uses a 1:10 twist rate.
- What bullet diameter is .300 Ruger Compact Magnum?
- .300 Ruger Compact Magnum uses a 0.3079″ (7.82 mm) diameter bullet.
- Is .300 Ruger Compact Magnum still in production?
- .300 Ruger Compact Magnum is discontinued; typical availability is limited.
- What is .300 Ruger Compact Magnum used for?
- .300 Ruger Compact Magnum is primarily used for hunting.
- What is .300 Ruger Compact Magnum based on?
- .300 Ruger Compact Magnum is derived from the .375 Ruger case.
Sources & provenance
- Standard SAAMI (Sporting Arms and Ammunition Manufacturers' Institute) — ANSI/SAAMI Z299.4 – 2015 (Centerfire Rifle) — Velocity & Pressure / Cartridge & Chamber Drawings · bullet ⌀ archived
- Standard C.I.P. (Commission Internationale Permanente) — C.I.P. TDCC Tab I — 300 RCM (Country of origin: US) · bullet ⌀ archived
- Secondary American Hunter (NRA) — Ruger Compact Magnums · velocity, year, grain weights archived
Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
