Lindcott Armory Rifle · SAAMI
.25 WSSM
The third and final WSSM — a .25-caliber super-short magnum.
- Caliber
- 0.2575″ · 6.54 mm
- Introduced
- 2004
- Case
- Rebated
- Parent
- .300 WSM
- Primary use
- Varmint, Hunting
- Status
- Discontinued
- Introduced
- 2004
- Type
- Rifle
- Origin
- United States
- Inventor
- Winchester
- Manufacturer
- Winchester
- Standard
- SAAMI
- Status
- Discontinued
- Availability
- Collector
- Case capacity
- 54 gr H₂O
- Twist (typical)
- 1:10
- Primer
- Large Rifle
- Case type
- Rebated
- Max pressure
- 65,000 psi
- Eff. range
- 400 yd
- Max range
- 700 yd
- Recoil
- 10–15 ft·lb
Ballistics
- By real loads
- 2,990–4,000 fps · 15 loads
- Parent case
- .300 WSM
Representative trajectory — modeled from a single velocity input (no published BC for this cartridge yet).
Performance
Buy links open .25 WSSM 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.
CIP TDCC · verified| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 6.54 | 0.257 | ✓ |
| Neck ⌀ | 7.60 | 0.299 | ✓ |
| Shoulder ⌀ | 13.83 | 0.544 | ✓ |
| Shoulder angle | 30° | — | ✓ |
| Base ⌀ | 14.12 | 0.556 | ✓ |
| Rim ⌀ | 13.59 | 0.535 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.37 | 0.054 | ✓ |
| Neck length | 7.63 | 0.300 | ≈ |
| Case length | 42.42 | 1.670 | ✓ |
| Overall length | 59.94 | 2.360 | ✓ |
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. .25 WSSM is highlighted below.
Factory loads
In production — 15 active loads across 5 brands. Top 15 shown · see all 16 →.
| Brand | Load | Grain | Bullet | FPS | ft·lb | BC |
|---|---|---|---|---|---|---|
| Nosler | Trophy Grade Ballistic Tip | 85 | Ballistic Tip | 4,000 | 3,019 | — |
| Winchester | Power Point SP | 85 | Power Point SP | 4,000 | 3,019 | — |
| Winchester | Ballistic Silvertip | 85 | Ballistic Silvertip | 4,000 | 3,019 | — |
| Winchester | AccuBond CT | 110 | Nosler AccuBond CT | 3,600 | 3,165 | — |
| Winchester | Ballistic Silvertip | 85 | BT | 3,470 | 2,272 | — |
| Hornady | Superformance | 110 | SST | 3,100 | 2,347 | — |
| Nosler | Trophy Grade | 110 | AccuBond | 3,100 | 2,347 | — |
| Federal | Fusion | 115 | Fusion SP | 3,060 | 2,391 | — |
| Federal | Nosler Tip | 115 | NST | 3,060 | 2,391 | — |
| Remington | Core-Lokt Ultra | 115 | Core-Lokt Ultra | 3,060 | 2,391 | — |
| Remington | AccuTip | 115 | AccuTip BT | 3,060 | 2,391 | — |
| Winchester | Super-X Power-Point | 120 | PSP | 2,990 | 2,382 | — |
| Federal | Power-Shok | 120 | SP | 2,990 | 2,382 | — |
| Hornady | Custom | 120 | BTHP | 2,990 | 2,382 | — |
| Nosler | Trophy Grade | 120 | Partition | 2,990 | 2,382 | — |
Velocities are manufacturer-stated (test-barrel). Discontinued loads dimmed.
Suitable powders
1 reloading powder listed for .25 WSSM, fastest to slowest. Cross-reference in the finder →
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 .25 WSSM
1 model in the database chamber .25 WSSM. Browse all →
Lineage
Connected reference
History
Introduced in 2004, a year after the .223 and .243 WSSM. Factory ammunition was discontinued around 2018–2019. The .25 WSSM had the smallest following of the three WSSM cartridges due to limited .25-caliber bullet selection compared to .22 and .24 caliber options.
FAQs
- What twist rate does .25 WSSM use?
- .25 WSSM typically uses a 1:10 twist rate.
- What bullet diameter is .25 WSSM?
- .25 WSSM uses a 0.2575″ (6.54 mm) diameter bullet.
- Is .25 WSSM still in production?
- .25 WSSM is discontinued; typical availability is collector.
- What is .25 WSSM used for?
- .25 WSSM is primarily used for varmint, hunting.
- What is .25 WSSM based on?
- .25 WSSM is derived from the .300 WSM case.
- What are the best powders for .25 WSSM?
- Reloading powders commonly listed for .25 WSSM include Reloader 17.
Sources & provenance
- StandardSAAMI — ANSI/SAAMI Z299 — Cartridge & Chamber Drawingsarchived
- StandardC.I.P. — C.I.P. TDCC — Tables of Dimensions of Cartridges and Chambers
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 15 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →