Lindcott Armory 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
- By real loads
- 3,200–3,680 fps · 9 loads
- Parent case
- —
Representative trajectory — modeled from a single velocity input (no published BC for this cartridge yet).
Performance
Buy links open 7.21 Lazzeroni Firebird ammunition at Rivertown Munitions.
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
In production — 9 active loads across 2 brands. Top 10 shown.
| Brand | Load | Grain | Bullet | FPS | ft·lb | BC |
|---|---|---|---|---|---|---|
| Lazzeroni Arms | Nosler Ballistic Tip | 130 | Ballistic Tip | 3,680 | 3,908 | — |
| Lazzeroni Arms | Nosler Partition SP | 140 | Nosler Partition | 3,580 | 3,983 | — |
| Lazzeroni Arms | AccuBond 140gr | 140 | AccuBond | 3,580 | 3,983 | — |
| Lazzeroni Arms | Barnes X BT | 140 | Barnes X BT | 3,580 | 3,983 | — |
| Lazzeroni Arms | Barnes X-Bullet 140gr | 140 | X-Bullet | 3,580 | 3,983 | — |
| Lazzeroni Arms | Partition 140gr | 140 | Partition | 3,580 | 3,983 | — |
| Lazzeroni Arms | SP Factory Load | 140 | SP BT | 3,580 | 3,983 | — |
| HSM | AccuBond 160gr | 160 | AccuBond | 3,350 | 3,986 | — |
| Lazzeroni Arms | JLK VLD 162gr | 162 | JLK VLD | 3,200 | 3,683 | — |
| A-Square | Dead Tough 160gr | 160 | Dead Tough SP | 3,350 | 3,986 | — |
Velocities are manufacturer-stated (test-barrel). Discontinued loads dimmed.
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 →