Rifle · SAAMI
.300 Norma Magnum
Adopted by SOCOM for the Advanced Sniper Rifle.
- Caliber
- 0.3083″ · 7.83 mm
- Introduced
- 2012
- Case
- Rimless
- Parent
- .338 Norma Magnum
- Primary use
- Long Range, Military, Competition
- Status
- Active
- Introduced
- 2012
- Type
- Rifle
- Origin
- Sweden
- Inventor
- Norma
- Manufacturer
- Norma
- Standard
- SAAMI
- Status
- Active
- Availability
- Common
- Case capacity
- 104 gr H₂O
- Twist (typical)
- 1:9
- Primer
- Large Rifle Magnum
- Case type
- Rimless
- Max pressure
- 61,000 psi, SAAMI transducer
- Eff. range
- 1500 yd
- Max range
- 6850 yd
- Recoil
- 28–40 ft·lb
Introduced by Norma
Ballistics
Published velocity/energy data isn't available for .300 Norma Magnum. Parent case: .338 Norma Magnum.
Performance
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 ⌀ | 7.83 | 0.308 | ✓ |
| Neck ⌀ | 8.68 | 0.342 | ✓ |
| Shoulder ⌀ | 14.29 | 0.563 | ✓ |
| Shoulder angle | 20.5° | — | ✓ |
| Base ⌀ | 14.87 | 0.585 | ✓ |
| Rim ⌀ | 14.93 | 0.588 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.52 | 0.060 | ✓ |
| Neck length | 7.78 | 0.306 | ≈ |
| Case length | 63.30 | 2.492 | ✓ |
| Overall length | 93.50 | 3.681 | ✓ |
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 Norma Magnum is highlighted below.
Factory loads
Being verified
Advertised FPS, energy, and BC are withheld until loads clear verification.
Suitable powders
13 reloading powders listed for .300 Norma Magnum, fastest to slowest. Cross-reference in the finder →
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 Norma Magnum
Lineage
Necked down to .308
Connected reference
History
Introduced by Norma in 2012. Selected by U.S. SOCOM for the Mk 22 Advanced Sniper Rifle System in 2019, alongside .300 PRC and .338 Norma Magnum. Provides extreme long-range capability with manageable recoil compared to .338 Lapua.
FAQs
- What twist rate does .300 Norma Magnum use?
- .300 Norma Magnum typically uses a 1:9 twist rate.
- What bullet diameter is .300 Norma Magnum?
- .300 Norma Magnum uses a 0.3083″ (7.83 mm) diameter bullet.
- Is .300 Norma Magnum still in production?
- .300 Norma Magnum is active; typical availability is common.
- What is .300 Norma Magnum used for?
- .300 Norma Magnum is primarily used for long range, military, competition.
- What is .300 Norma Magnum based on?
- .300 Norma Magnum is derived from the .338 Norma Magnum case.
- What are the best powders for .300 Norma Magnum?
- Reloading powders commonly listed for .300 Norma Magnum include N555, N560, Norma MRP, N165, among 13 suitable options.
Sources & provenance
- Standard SAAMI — SAAMI cartridge & chamber drawing — .300 Norma Magnum archived
- Standard SAAMI — ANSI/SAAMI Z299.4-2025 — Centerfire Rifle Velocity & Pressure Data · grain_ballistics, representative_gun archived
- Standard C.I.P. — C.I.P. TDCC — Tables of Dimensions of Cartridges and Chambers
- Manufacturer Norma — Norma Golden Target 300 Norma Mag 220gr (SKU 20177712) · representative_gun, grain_ballistics archived
- Manufacturer Berger Bullets (Berger Ammunition) — 300 Norma Magnum 215gr Hybrid Target Rifle Ammunition (SKU 62020) · representative_gun, grain_ballistics archived
- Manufacturer Federal Premium — Gold Medal Berger 300 Norma Mag 215 Grain (GM300NMBH1) · representative_gun, grain_ballistics archived
- Manufacturer Berger Bullets (Berger Ammunition) — 300 Norma Magnum 245gr Long Range Hybrid Target Rifle Ammunition (SKU 62030) · representative_gun, grain_ballistics
- Manufacturer Norma — Norma Hybrid Target 300 Norma Mag. 230gr (SKU 20174602) · representative_gun, grain_ballistics
- Manufacturer Berger Bullets (Berger Ammunition) — 300 Norma Magnum 230gr Hybrid OTM Tactical Rifle Ammunition (SKU 62010) · representative_gun, grain_ballistics archived
- Secondary Lapua — .338 Norma Magnum (manufacturer; confirms .416 Rigby is the grandparent) · parent_cartridge
- Secondary American Rifleman (NRA) — The .300 Norma Magnum: History & Performance · parent_cartridge
- Secondary Cartridges of the World 13th ed. (Barnes/Mann, p.471) via Wikipedia — .300 Norma Magnum · parent_cartridge
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 43 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
