Rifle · Proprietary
6.53 Lazzeroni Scramjet
The 6.53 Lazzeroni Scramjet is the .257-caliber member of the Lazzeroni proprietary family.
- Caliber
- 0.257″ · 6.528 mm
- Introduced
- 1997
- Case
- Rimless
- Parent
- 7.82 Lazzeroni Warbird
- Primary use
- hunting
- Status
- Active
- Introduced
- 1997
- Type
- Rifle
- Origin
- United States
- Inventor
- John Lazzeroni
- Manufacturer
- Lazzeroni Arms
- Standard
- Proprietary
- Status
- Active
- Availability
- Rare
- Case capacity
- 99.1 gr H₂O
- Twist (typical)
- 1:10
- Primer
- Large Rifle Magnum
- Case type
- Rimless
- Max pressure
- 66,718 psi, SAAMI transducer
- Eff. range
- 500 yd
- Max range
- 4350 yd
- Recoil
- 20.2–24.8 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for 6.53 Lazzeroni Scramjet, 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
- 7.82 Lazzeroni Warbird
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.
Lazzeroni/MAST drawing · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 6.53 | 0.257 | ~ |
| Neck ⌀ | 7.37 | 0.290 | ~ |
| Shoulder ⌀ | 12.93 | 0.509 | ~ |
| Shoulder angle | 30° | — | ~ |
| Base ⌀ | 13.44 | 0.529 | ~ |
| Rim ⌀ | 13.44 | 0.529 | ~ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.14 | 0.045 | ~ |
| Neck length | 7.37 | 0.290 | ≈ |
| Case length | 70.87 | 2.790 | ~ |
| Overall length | 88.14 | 3.470 | ~ |
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. 6.53 Lazzeroni Scramjet is highlighted below.
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
Part of the Lazzeroni Arms Company line designed in the mid-1990s, the Scramjet gives .257-caliber hunters flat-shooting performance at ranges beyond what conventional commercial cartridges provide. Like all Lazzeroni offerings, components are available exclusively through Lazzeroni Arms.
FAQs
- What twist rate does 6.53 Lazzeroni Scramjet use?
- 6.53 Lazzeroni Scramjet typically uses a 1:10 twist rate.
- What bullet diameter is 6.53 Lazzeroni Scramjet?
- 6.53 Lazzeroni Scramjet uses a 0.257″ (6.528 mm) diameter bullet.
- Is 6.53 Lazzeroni Scramjet still in production?
- 6.53 Lazzeroni Scramjet is active; typical availability is rare.
- What is 6.53 Lazzeroni Scramjet used for?
- 6.53 Lazzeroni Scramjet is primarily used for hunting.
- What is 6.53 Lazzeroni Scramjet based on?
- 6.53 Lazzeroni Scramjet is derived from the 7.82 Lazzeroni Warbird 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 →
