Lindcott Armory 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
- Status
- Active
- Introduced
- 1955
- Type
- Rifle
- Origin
- United States
- Inventor
- P.O. Ackley
- Standard
- Proprietary
- Status
- Active
- Availability
- Uncommon
- Primer
- Boxer Small Rifle
- Case type
- Rimless
- Max pressure
- 65,000 psi
- Eff. range
- 500 yd
Ballistics
- 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 | 48.56 | 1.912 | · |
| Overall length | 59.69 | 2.350 | ~ |
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 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 based on?
- .22-250 Ackley Improved is derived from the .22-250 Remington case.
Sources & provenance
- ManufacturerSierra Bullets — Sierra Load Data — .22-250 Ackley Improved · bullet ⌀, velocity, grain weightsarchived
- SecondaryAccurateShooter.net (reprinting Sierra data) — .22-250 Ackley Improved Sierra Loads (PDF) · velocityarchived
Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →