Lindcott Armory Rifle · Not SAAMI standardized
.500 A-Square
A-Square's powerful proprietary cartridge using a rebated rimless case.
- Introduced
- 1989
- Type
- Rifle
- Origin
- United States
- Inventor
- Art Alphin / A-Square
- Manufacturer
- A-Square Company
- Standard
- Not SAAMI standardized
- Status
- Discontinued
- Availability
- Collector
- Bullet ⌀
- 0.51″
- Case capacity
- 165 gr H₂O
- Twist
- 1:15
- Primer
- Boxer Large Rifle
- Case type
- Rimless
- Max pressure
- 65,000 psi
- Eff. range
- 150 yd
- Recoil
- 65–85 ft·lb
Ballistics
- Velocity
- 2,200–2,400 fps
- Energy
- 5,484–6,525 ft·lb
- By real loads
- 2,200–2,470 fps · 17 loads
- Typical MSRP
- $1.60/rd · price history →
- Parent case
- —
Representative trajectory — modeled from a single velocity input, not a measured load. Real published loads span the "by real loads" range above.
Factory loads
In production — 17 active loads across 14 brands. Top 15 shown · see all 20 →.
| Brand | Load | Grain | Bullet | FPS | ft·lb | BC | $/rd |
|---|---|---|---|---|---|---|---|
| A-Square | Monolithic Solid | 600 | Solid | 2,470 | 8,127 | — | — |
| Woodleigh | Heavy Grade | 600 | FMJ-BT | 2,450 | 7,996 | — | — |
| Kynoch | Safari | 600 | SP | 2,450 | 7,996 | — | $8.00 |
| Norma | African PH | 600 | SP | 2,450 | 7,996 | — | $4.00 |
| RWS | Safari | 600 | SP | 2,450 | 7,996 | — | $1.80 |
| Federal | Trophy Bonded | 600 | TBT | 2,450 | 7,996 | — | $0.85 |
| Northfork | Northfork Safari | 600 | FMJ Solid | 2,200 | 6,447 | — | — |
| Hornady | Dangerous Game | 600 | DGX Bonded | 2,200 | 6,447 | — | $0.85 |
| Graf & Sons | Graf Heritage | 600 | SP | 2,200 | 6,447 | — | $0.70 |
| Kynoch | Soft Nose | 600 | Soft Point | 2,200 | 6,447 | — | $8.00 |
| RWS | Classic | 600 | Soft Point | 2,200 | 6,447 | — | $1.60 |
| Bertram | Custom | 600 | Soft Point | 2,200 | 6,447 | — | $4.50 |
| Buffalo Arms | Custom SP | 600 | Soft Point | 2,200 | 6,447 | — | $2.80 |
| Norma | Africa PH | 600 | Soft Point | 2,200 | 6,447 | — | $1.60 |
| Graf | FMJ Standard | 600 | Soft Point | 2,200 | 6,447 | — | $0.75 |
Velocities are manufacturer-stated (test-barrel). Discontinued loads dimmed.
Reloading cost
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.
Firearms chambered in .500 A-Square
2 models in the database chamber .500 A-Square. Browse all →
Connected reference
History
Developed by A-Square company in the 1980s using a rebated rimless case design. Intended as an alternative to .505 Gibbs for ultra-heavy dangerous game. The cartridge fires 600-grain bullets at ~2,200 fps, generating extreme recoil. A-Square's demise limited commercial adoption; primarily a custom market cartridge.
FAQs
- What twist rate does .500 A-Square use?
- .500 A-Square typically uses a 1:15 twist rate.
- What bullet diameter is .500 A-Square?
- .500 A-Square uses a 0.51″ (12.95 mm) diameter bullet.
- Is .500 A-Square still in production?
- .500 A-Square is discontinued; typical availability is collector.
- What is .500 A-Square used for?
- .500 A-Square is primarily used for hunting.
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 17 live factory loads; the trajectory is modeled (point-mass), not measured. Spotted an error? Report it →