Rifle · Proprietary
.22-250 Ackley Improved
Ackley Improved version of the .22-250; pushes .224 bullets to near-.220 Swift velocities with better case life; popular among varmint hunters wanting maximum velocity..
- Caliber
- 0.224″ · 5.69 mm
- Introduced
- 1955
- Case
- Rimless
- Parent
- .22-250 Remington
- Primary use
- Hunting
- Status
- Active
- Introduced
- 1955
- Type
- Rifle
- Origin
- United States
- Inventor
- P.O. Ackley
- Manufacturer
- None (wildcat; designed by P.O. Ackley)
- Standard
- Proprietary
- Status
- Active
- Availability
- Uncommon
- Case capacity
- 46.9 gr H₂O
- Twist (typical)
- 1:14
- Primer
- Boxer Small Rifle
- Case type
- Rimless
- Max pressure
- 65,000 psi, SAAMI transducer
- Eff. range
- 500 yd
- Max range
- 3750 yd
- Recoil
- 5.1–8.1 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .22-250 Ackley Improved, 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
- .22-250 Remington
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.
reloading data · secondary source| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 5.69 | 0.224 | · |
| Neck ⌀ | 6.45 | 0.254 | · |
| Shoulder ⌀ | 11.53 | 0.454 | · |
| Shoulder angle | 40° | — | · |
| Base ⌀ | 11.86 | 0.467 | · |
| Rim ⌀ | 12.01 | 0.473 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.24 | 0.049 | · |
| Neck length | 6.86 | 0.270 | ≈ |
| Case length | 49.28 | 1.940 | · |
| Overall length | 61.72 | 2.430 | ~ |
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. .22-250 Ackley Improved 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
The .22-250 AI reshapes the parent .22-250 Remington case with a sharper shoulder angle, increasing powder capacity and adding approximately 100 fps over the standard .22-250. It is fireformed from standard brass and produces less case stretching than the parent, making it a practical wildcat for serious varmint hunters.
FAQs
- What twist rate does .22-250 Ackley Improved use?
- .22-250 Ackley Improved typically uses a 1:14 twist rate.
- What bullet diameter is .22-250 Ackley Improved?
- .22-250 Ackley Improved uses a 0.224″ (5.69 mm) diameter bullet.
- Is .22-250 Ackley Improved still in production?
- .22-250 Ackley Improved is active; typical availability is uncommon.
- What is .22-250 Ackley Improved used for?
- .22-250 Ackley Improved is primarily used for hunting.
- What is .22-250 Ackley Improved based on?
- .22-250 Ackley Improved is derived from the .22-250 Remington case.
Sources & provenance
- Manufacturer Sierra — Sierra Load Data — .22-250 Ackley Improved · bullet ⌀, grain weights, velocity archived
- Secondary AccurateShooter.net (reprinting Sierra data) — .22-250 Ackley Improved Sierra Loads (PDF) · velocity archived
Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
