Pistol · Proprietary · Not SAAMI standardized · Not standardizedObsolete
.451 Detonics Magnum
The .451 Detonics Magnum (11.5x24mm) is a pistol cartridge similar to the .45 ACP with a reinforced case for higher pressure, made by trimming the .45 Winchester Magnum to 0.942 in; loaded with 185 and 200 gr bullets..
- Caliber
- 0.451″ · 11.46 mm
- Introduced
- 1980
- Case
- Rimless
- Parent
- .45 Winchester Magnum
- Primary use
- Self-Defense
- Status
- Obsolete
- Obsolete
- Obsolete
- Introduced
- 1980
- Type
- Pistol
- Origin
- United States
- Inventor
- Detonics (approx: name-implied maker)
- Manufacturer
- Detonics (approx)
- Standard
- Proprietary · Not SAAMI standardized · Not standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Obsolete
- Availability
- Rare
- Case capacity
- 27.4 gr H₂O
- Twist (typical)
- 1:16
- Primer
- Large Pistol
- Case type
- Rimless
- Max pressure
- 40,000 CUP, SAAMI crusher
- Eff. range
- 50 yd
- Max range
- 1900 yd
- Recoil
- 2.6–5.3 ft·lb
- Subsonic
- Capable
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .451 Detonics Magnum, 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
- .45 Winchester Magnum
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 · secondary source| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 11.46 | 0.451 | |
| Neck ⌀ | 12.01 | 0.473 | |
| Shoulder ⌀ | — | — | |
| Shoulder angle | — | — | |
| Base ⌀ | 12.09 | 0.476 | |
| Rim ⌀ | 12.19 | 0.480 | |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.24 | 0.049 | |
| Neck length | — | — | |
| Case length | 23.90 | 0.941 | · |
| Overall length | 33.58 | 1.322 | |
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. .451 Detonics Magnum is highlighted below.
Missing a dimension for .451 Detonics Magnum? 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.
Firearms chambered in .451 Detonics Magnum
Lineage
Connected reference
History
Deliberately longer than .45 ACP to avoid accidental use.
FAQs
- What twist rate does .451 Detonics Magnum use?
- .451 Detonics Magnum typically uses a 1:16 twist rate.
- What bullet diameter is .451 Detonics Magnum?
- .451 Detonics Magnum uses a 0.451″ (11.46 mm) diameter bullet.
- Is .451 Detonics Magnum still in production?
- .451 Detonics Magnum is obsolete; typical availability is rare.
- What is .451 Detonics Magnum used for?
- .451 Detonics Magnum is primarily used for self-defense.
- What is .451 Detonics Magnum based on?
- .451 Detonics Magnum is derived from the .45 Winchester Magnum 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 →
