Hunting construction
Soft-point, bonded, partitioned, and monolithic expanding bullets are designed differently. Their intended impact-velocity ranges and use cases come from the bullet or ammunition manufacturer.
THE CARTRIDGE LIBRARY · SPORTING & MATCH RIFLE
.280 Ackley Improved
A 7mm-class sporting cartridge with the Ackley Improved shoulder and case profile. The standardized cartridge must be distinguished from older custom chamber interpretations.
2A Ledger reference desk · Sources checked October 18, 2026
Read the dimensions
- Overall · min–max
- 3.136–3.330 in
79.654–84.582 mm - Case length · max
- 2.525 in
64.135 mm - Bullet maximum
- 0.2845 in
7.226 mm - Rim diameter · max
- 0.472 in
11.989 mm
Know the exact name
At a glance
- Cartridge family
- Sporting & match rifle
- Bullet specification
- 0.2845 in / 7.226 mmBullet maximum
- Factory examples
- 4 loadsSelected, sourced examples below
- Weight in cited examples
- 140–168 grGrains measure mass, not powder charge
.280 Ackley Improved is identified by its complete cartridge designation. The resource-table alternative is 280 Ackley Improved. A caliber number, bullet diameter, or family resemblance on its own does not identify ammunition compatibility.
Older custom Ackley chambers may need individual verification. This guide does not provide case-forming or handloading instructions.
Dimensions: open the exact dimensional drawing ↗. The displayed number is bullet maximum, rather than an assertion that every manufactured projectile or barrel has this exact diameter.
Origins & evolution
Background & development
The .280 Ackley Improved belongs to P. O. Ackley’s broader tradition of revised sporting cartridges. Its lineage runs through the .280 Remington and the earlier 7 mm-.30-06 wildcat idea. The defining historical concept was a less tapered case and a steeper shoulder intended to obtain more capacity from the existing long-action case family.
That idea filled a particular sporting niche before 7 mm magnums became common factory offerings. Even after newer magnums crowded the market, the .280 Ackley retained a following among custom-rifle owners who wanted a performance step beyond the parent .280 without moving to a substantially larger magnum case. The name’s survival reflects the influence of individual gunsmiths and wildcatters on commercial sporting ammunition. Its development should be understood as a distinct branch of the .280 story, rather than merely a promotional adjective attached to the original Remington cartridge.
Historical sources: Sierra: .280 Ackley Improved cartridge history ↗
Construction changes the story
Loads, variations & specialty offerings
Match construction
Open-tip match and tipped match bullets prioritize consistency and aerodynamics. A match designation does not by itself mean the projectile was designed for hunting expansion.
Specialty offerings
Lead-free, reduced-recoil, and premium long-range products are separate load designs when offered. Compare the exact SKU, bullet weight, test barrel, and intended role rather than relying on a cartridge-wide average.
In the cited .280 Ackley Improved examples, bullet weights are 140, 155, 162, 168 grains. These are the weights actually present in this source selection, not a claim that every possible loading is listed.
Bullet construction background: Hornady: anatomy of a bullet ↗. Exact product descriptions and velocities are cited in the factory table.
From the factory catalog
140 grains
3,075 fps
TROPHY COPPER
155 grains
2,930 fps
TERMINAL ASCENT
162 grains
2,850 fps
ELD-X®
Compare all 4 cited factory load records
| Maker / product | Bullet mass | Published construction | Muzzle velocity | Test barrel | Source |
|---|---|---|---|---|---|
| FederalP280AITC1 | 140 gr 9.07 g | TROPHY COPPER | 3,075 fps 937 m/s | 24 in | Federal · PDF pp. 52–53 ↗ |
| FederalP280AITA1 | 155 gr 10.04 g | TERMINAL ASCENT | 2,930 fps 893 m/s | 24 in | Federal · PDF pp. 52–53 ↗ |
| Hornady85586 | 162 gr 10.50 g | ELD-X® | 2,850 fps 869 m/s | Not stated here; see source | Hornady · PDF p. 185 ↗ |
| FederalP280AIBCH1 | 168 gr 10.89 g | BERGER HYBRID HUNTER | 2,830 fps 863 m/s | 24 in | Federal · PDF pp. 52–53 ↗ |
Explore the published data
Ballistics you can inspect
Select a legend entry to add or remove its line. Hover or tap a plotted point, or use the position slider. With the graph focused, arrow keys move the inspector. Solid dots identify source points; dashed connectors show estimates between them. Load construction, pressure category, and test setup can differ even at the same grain weight.
Read the original values as accessible tables
.280 Ackley Improved: factory velocity downrange
| Exact load | Source | Published points |
|---|---|---|
| 140 gr Federal TROPHY COPPER | Federal | 0: 3075; 100: 2877; 200: 2688; 300: 2506; 400: 2332; 500: 2165 |
| 155 gr Federal TERMINAL ASCENT | Federal | 0: 2930; 100: 2770; 200: 2615; 300: 2465; 400: 2321; 500: 2181 |
| 162 gr Hornady ELD-X® | Hornady | 0: 2850; 100: 2704; 200: 2562; 300: 2424; 400: 2291; 500: 2162 |
| 168 gr Federal BERGER HYBRID HUNTER | Federal | 0: 2830; 100: 2668; 200: 2511; 300: 2360; 400: 2214; 500: 2073 |
How to interpret the comparison
Changing bullet weight also often changes bullet design and propellant choice. Two curves are comparisons of the listed products, not a controlled experiment proving that bullet weight alone caused the difference. Catalog downrange points are projections under the maker’s conditions; barrel-study points are recorded observations in the study firearm.
Direct answers
Common questions
What is .280 Ackley Improved?
A 7mm-class sporting cartridge with the Ackley Improved shoulder and case profile. The standardized cartridge must be distinguished from older custom chamber interpretations.
What diameter does .280 Ackley Improved use?
The cited dimensional standard lists 0.2845 inches (7.226 mm), bullet maximum. This drawing convention is different from a casual caliber nickname.
Are similarly named cartridges interchangeable?
Older custom Ackley chambers may need individual verification. This guide does not provide case-forming or handloading instructions.
Are the graph values measured or estimated?
The downrange view uses the exact manufacturer catalog records shown in the source table. Dashed connectors and intermediate inspector values use linear interpolation between the displayed source points. Calculated energy uses the listed bullet mass and velocity.
Does higher energy mean the best load?
Energy is calculated from mass and velocity. It does not establish accuracy, expansion, penetration, pattern density, recoil, or suitability for a particular firearm. Use the exact product documentation and firearm manual.
Trace the facts
Sources & methodology
Compiled by 2A Ledger from the linked standards, manufacturer publications, and identified test records. Checked October 18, 2026. Historical tests and older catalogs retain their original dates; a listing here does not establish current availability.
- SAAMI: dimensional drawing · PDF p. 105 ↗
- Sierra: .280 Ackley Improved cartridge background ↗
- Federal · PDF pp. 52–53 ↗
- Hornady · PDF p. 185 ↗
Diameter figures preserve the cited drawing convention. Inch–millimeter conversion uses exactly 25.4 mm per inch. Factory specifications describe the maker’s test setup; your firearm, ammunition lot, temperature, and measuring method can produce different results. This is an educational factory-ammunition reference, not a reloading manual.