Rifle · Proprietary
7.21 Lazzeroni Firebird
John Lazzeroni's proprietary ultra-magnum 7mm: an enormous beltless case generating velocities that approach the theoretical maximum for 7mm bullets..
- Caliber
- 0.284″ · 7.214 mm
- Introduced
- 1996
- Case
- Rimless
- Primary use
- Hunting, Target
- Status
- Limited
- Introduced
- 1996
- Type
- Rifle
- Origin
- United States
- Inventor
- John Lazzeroni
- Manufacturer
- Lazzeroni Ammunition Company
- Standard
- Proprietary
- Status
- Limited
- Availability
- Scarce
- Case capacity
- 120 gr H₂O
- Twist (typical)
- 1:9
- Primer
- Large Rifle Magnum
- Case type
- Rimless
- Max pressure
- 65,000 psi
- Eff. range
- 800 yd
- Max range
- 2500 yd
- Recoil
- 30–42 ft·lb
Ballistics
Published velocity/energy data isn't available for 7.21 Lazzeroni Firebird.
Performance
Dimensionscase measurements · scale drawing · size vs familiar rounds
Case dimensions — the scale drawing at the top of the page is built from these.
Lazzeroni/MAST drawing · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 7.21 | 0.284 | · |
| Neck ⌀ | 8.20 | 0.323 | · |
| Shoulder ⌀ | 14.22 | 0.560 | ~ |
| Shoulder angle | 30° | — | ~ |
| Base ⌀ | 14.71 | 0.579 | ~ |
| Rim ⌀ | 14.73 | 0.580 | ~ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.14 | 0.045 | · |
| Neck length | 7.42 | 0.292 | ≈ |
| Case length | 71.37 | 2.810 | · |
| Overall length | 92.20 | 3.630 | ~ |
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. 7.21 Lazzeroni Firebird 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.
Connected reference
History
Introduced by John Lazzeroni in 1996 as part of his proprietary cartridge family designed around a new metric naming convention (bore diameter in mm). Lazzeroni's approach was to build beltless magnums on larger, fatter cases than the traditional H&H-derived designs, avoiding the accuracy issues associated with headspacing on a belt. The 7.21 Firebird's case capacity dwarfs conventional 7mm magnums, pushing 140-grain bullets past 3,500 fps — performance impossible with any other 7mm cartridge. Requires custom or Lazzeroni-branded rifles.
FAQs
- What twist rate does 7.21 Lazzeroni Firebird use?
- 7.21 Lazzeroni Firebird typically uses a 1:9 twist rate.
- What bullet diameter is 7.21 Lazzeroni Firebird?
- 7.21 Lazzeroni Firebird uses a 0.284″ (7.214 mm) diameter bullet.
- Is 7.21 Lazzeroni Firebird still in production?
- 7.21 Lazzeroni Firebird is limited; typical availability is scarce.
- What is 7.21 Lazzeroni Firebird used for?
- 7.21 Lazzeroni Firebird is primarily used for hunting, target.
Sources & provenance
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 9 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →