Rifle · Not SAAMI standardized · Not standardizedObsolete
.277 Wolverine
.277 Wolverine is a rimless bottlenecked rifle cartridge of United States origin.
- Caliber
- 0.277″ · 7.036 mm
- Introduced
- 2014
- Case
- Rimless
- Parent
- 5.56x45mm NATO
- Primary use
- Hunting
- Status
- Discontinued
- Obsolete
- Obsolete
- Introduced
- 2014
- Type
- Rifle
- Origin
- United States
- Inventor
- Mark Kexel, Mad Dog Weapon Systems, Inc.
- Manufacturer
- Mark Kexel, Mad Dog Weapon Systems, Inc.
- Standard
- Not SAAMI standardized · Not standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Discontinued
- Availability
- Rare
- Case capacity
- 26.9 gr H₂O
- Twist (typical)
- 1:7.0
- Primer
- Small Rifle
- Case type
- Rimless
- Max pressure
- 62,000 psi, SAAMI transducer
- Eff. range
- 300 yd
- Max range
- 1500 yd
- Recoil
- 3.8–4.5 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .277 Wolverine, 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
- 5.56x45mm NATO
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 ⌀ | 7.04 | 0.277 | · |
| Neck ⌀ | 7.85 | 0.309 | · |
| Shoulder ⌀ | 9.04 | 0.356 | · |
| Shoulder angle | 31.9° | — | |
| Base ⌀ | 9.58 | 0.377 | · |
| Rim ⌀ | 9.60 | 0.378 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.04 | 0.041 | |
| Neck length | 7.27 | 0.286 | |
| Case length | 38.86 | 1.530 | · |
| Overall length | 57.40 | 2.260 | · |
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. .277 Wolverine is highlighted below.
Missing a dimension for .277 Wolverine? 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.
Lineage
Connected reference
History
Introduced around 2014 by Mark Kexel, Mad Dog Weapon Systems, Inc., derived from the 5.56x45mm NATO.
FAQs
- What twist rate does .277 Wolverine use?
- .277 Wolverine typically uses a 1:7.0 twist rate.
- What bullet diameter is .277 Wolverine?
- .277 Wolverine uses a 0.277″ (7.036 mm) diameter bullet.
- Is .277 Wolverine still in production?
- .277 Wolverine is discontinued; typical availability is rare.
- What is .277 Wolverine used for?
- .277 Wolverine is primarily used for hunting.
- What is .277 Wolverine based on?
- .277 Wolverine is derived from the 5.56x45mm NATO 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 →
