Rifle · Not SAAMI standardized · Not standardizedObsolete
.275 No. 2 Magnum
.275 No.
- Caliber
- 0.284″ · 7.214 mm
- Introduced
- 1927
- Case
- Rimmed
- Parent
- .375 Flanged Nitro Express
- Primary use
- Hunting
- Status
- Discontinued
- Obsolete
- Obsolete
- Introduced
- 1927
- Type
- Rifle
- Origin
- United Kingdom
- Inventor
- John Rigby & Company
- Manufacturer
- John Rigby & Co.
- Standard
- Not SAAMI standardized · Not standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Discontinued
- Availability
- Rare
- Case capacity
- 65.3 gr H₂O
- Twist (typical)
- 1:9
- Primer
- Berdan 217
- Case type
- Rimmed
- Max pressure
- 22,000 psi, CIP transducer
- Eff. range
- 300 yd
- Max range
- 1500 yd
- Recoil
- 12.5 ft·lb
Introduced by John Rigby & Co.
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .275 No. 2 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 Flanged Nitro Express
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.
Wikipedia · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 7.21 | 0.284 | · |
| Neck ⌀ | 8.08 | 0.318 | · |
| Shoulder ⌀ | 11.43 | 0.450 | · |
| Shoulder angle | 15.6° | — | |
| Base ⌀ | 12.95 | 0.510 | · |
| Rim ⌀ | 14.78 | 0.582 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.70 | 0.067 | |
| Neck length | 7.45 | 0.293 | |
| Case length | 63.50 | 2.500 | · |
| Overall length | 82.80 | 3.260 | · |
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. .275 No. 2 Magnum is highlighted below.
Missing a dimension for .275 No. 2 Magnum? Some case measurements aren't in a published SAAMI/CIP drawing yet. Have a factory or reamer print? Send it → — verified hard-to-find data earns a free Lindcott sticker.
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 1927 by John Rigby & Company, derived from the .375 Flanged Nitro Express.
FAQs
- What twist rate does .275 No. 2 Magnum use?
- .275 No. 2 Magnum typically uses a 1:9 twist rate.
- What bullet diameter is .275 No. 2 Magnum?
- .275 No. 2 Magnum uses a 0.284″ (7.214 mm) diameter bullet.
- Is .275 No. 2 Magnum still in production?
- .275 No. 2 Magnum is discontinued; typical availability is rare.
- What is .275 No. 2 Magnum used for?
- .275 No. 2 Magnum is primarily used for hunting.
- What is .275 No. 2 Magnum based on?
- .275 No. 2 Magnum is derived from the .375 Flanged Nitro Express 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 →
