Rifle · CIP
.375 Flanged Magnum
Holland & Holland's rimmed version of the .375 H&H, designed for use in double rifles where rimmed cases feed more reliably.
- Caliber
- 0.3748″ · 9.52 mm
- Introduced
- 1912
- Case
- Belted
- Parent
- .375 H&H Magnum
- Primary use
- Hunting
- Status
- Limited
- Introduced
- 1912
- Type
- Rifle
- Origin
- United Kingdom
- Inventor
- Holland & Holland
- Manufacturer
- Holland & Holland
- Standard
- CIP
- Status
- Limited
- Availability
- Limited
- Case capacity
- 95 gr H₂O
- Twist (typical)
- 1:12
- Primer
- Boxer Large Rifle
- Case type
- Belted
- Max pressure
- 47,137 psi, CIP transducer
- Eff. range
- 200 yd
- Max range
- 4500 yd
- Recoil
- 48.9–65 ft·lb
Introduced by Holland & Holland
Ballistics
Published velocity/energy data isn't available for .375 Flanged Magnum. Parent case: .375 H&H 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 ⌀ | 9.52 | 0.375 | ✓ |
| Neck ⌀ | 10.29 | 0.405 | ✓ |
| Shoulder ⌀ | 11.43 | 0.450 | ✓ |
| Shoulder angle | 12.6° | — | ✓ |
| Base ⌀ | 13.13 | 0.517 | ✓ |
| Rim ⌀ | 14.35 | 0.565 | ✓ |
| Belt ⌀ | 13.62 | 0.536 | |
| Rim thickness | 1.52 | 0.060 | ~ |
| Neck length | 11.18 | 0.440 | ≈ |
| Case length | 74.68 | 2.940 | ✓ |
| Overall length | 96.52 | 3.800 | ✓ |
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. .375 Flanged Magnum is highlighted below.
Factory loads
Being verified
Advertised FPS, energy, and BC are withheld until loads clear verification.
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
flanged (rimmed) case for double rifles, lower pressure
History
Holland & Holland introduced the flanged (rimmed) version of their .375 Magnum in the early 1900s for use in double rifles, where rimmed cases improve reliable extraction. Offers ballistics similar to the rimless .375 H&H but intended for break-action and double-barrel rifles favored by dangerous game hunters.
FAQs
- What twist rate does .375 Flanged Magnum use?
- .375 Flanged Magnum typically uses a 1:12 twist rate.
- What bullet diameter is .375 Flanged Magnum?
- .375 Flanged Magnum uses a 0.3748″ (9.52 mm) diameter bullet.
- Is .375 Flanged Magnum still in production?
- .375 Flanged Magnum is limited; typical availability is limited.
- What is .375 Flanged Magnum used for?
- .375 Flanged Magnum is primarily used for hunting.
- What is .375 Flanged Magnum based on?
- .375 Flanged Magnum is derived from the .375 H&H Magnum case.
Sources & provenance
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 19 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
