Rifle · CIP
10.3x68mm Magnum
10.3x68mm Magnum is a belted bottlenecked rifle cartridge of Switzerland origin.
- Caliber
- 0.4138″ · 10.51 mm
- Introduced
- 2017
- Case
- Belted
- Parent
- .375 H&H Magnum
- Primary use
- Hunting
- Status
- Active
- Introduced
- 2017
- Type
- Rifle
- Origin
- Switzerland
- Inventor
- Peter Vonow
- Manufacturer
- Peter Vonow
- Standard
- CIP
- Status
- Active
- Availability
- Limited
- Case capacity
- 100.7 gr H₂O
- Twist (typical)
- 1:17.7
- Primer
- Large Rifle Magnum
- Case type
- Belted
- Max pressure
- 63,817 psi, CIP transducer
- Eff. range
- 250 yd
- Max range
- 1250 yd
- Recoil
- 53.1–58.4 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for 10.3x68mm 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 H&H Magnum
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 ⌀ | 10.51 | 0.414 | ✓ |
| Neck ⌀ | 11.18 | 0.440 | ✓ |
| Shoulder ⌀ | 12.42 | 0.489 | ✓ |
| Shoulder angle | 25° | — | ≈ |
| Base ⌀ | 13.03 | 0.513 | ✓ |
| Rim ⌀ | 13.51 | 0.532 | ✓ |
| Belt ⌀ | 13.51 | 0.532 | ✓ |
| Rim thickness | 1.27 | 0.050 | ✓ |
| Neck length | 11.67 | 0.459 | ≈ |
| Case length | 68.00 | 2.677 | ✓ |
| Overall length | 91.44 | 3.600 | ✓ |
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. 10.3x68mm 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.
Lineage
Connected reference
History
Introduced around 2017.
FAQs
- What twist rate does 10.3x68mm Magnum use?
- 10.3x68mm Magnum typically uses a 1:17.7 twist rate.
- What bullet diameter is 10.3x68mm Magnum?
- 10.3x68mm Magnum uses a 0.4138″ (10.51 mm) diameter bullet.
- Is 10.3x68mm Magnum still in production?
- 10.3x68mm Magnum is active; typical availability is limited.
- What is 10.3x68mm Magnum used for?
- 10.3x68mm Magnum is primarily used for hunting.
- What is 10.3x68mm Magnum based on?
- 10.3x68mm Magnum is derived from the .375 H&H Magnum 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 →
