.280 Ackley Improved Load Data & Reloading Guide
Also known as: .280 AI, 7mm Ackley Improved, 7mm-280 Ackley Improved
About .280 Ackley Improved
The .280 Ackley Improved is a necked-up version of the original .270 Winchester cartridge, developed in the 1940s by P.O. Ackley. His intent was to enhance the cartridge's performance by improving the case design for higher velocities and more efficient powder burn. By increasing the chamber pressure and reshaping the case with a sharper shoulder, the .280 Ackley Improved quickly became recognized for its superior ballistics and versatility.
In terms of technical characteristics, the .280 Ackley Improved typically features a case length of 2.57 inches and a shoulder angle of 40 degrees. This enables reloaders to maximize case capacity, allowing for heavier charges of extruded or spherical powders. Reloading often leads to improved velocity and reduced standard deviation in velocity measurements, which is advantageous for achieving reliable accuracy.
Ballistic performance is noteworthy, with many loads exhibiting exceptional muzzle velocities in the range of 2,800 to 3,000 feet per second. The caliber commonly utilizes bullet weights ranging from 140 to 175 grains, making it suitable for various applications, including hunting medium to large game, as well as competitive shooting.
For reloaders, the .280 Ackley Improved offers several advantages, such as a wider selection of bullet types and weights, enhanced ballistic efficiency, and the ability to create custom loads tailored to specific shooting needs or preferences. Its efficient case design also contributes to longer case life when properly managed, making it an attractive option for those engaged in handloading practices.
Technical Drawing
Based on SAAMI, the max. allowed case length is 2.525 in / 64.14 mm, the max. cartridge length is 3.330 in / 84.58 mm, and the max. allowed pressure is 65,000 PSI / 4,482 bar.
Technical Specifications
Start Calculating to Develop your own Load Data for .280 Ackley Improved
Use our professional ballistics calculator to develop safe and accurate load recipes for .280 Ackley Improved.
Start CalculatingBrass Case Capacities
The following table shows the case capacity (Grains of Water) for brass in cartridge .280 Ackley Improved where we have data (number of datapoints in brackets).
You need a PRO license to unlock and view all data.
Unlock 1 more brass case capacities with PRO.
Standard Load Data — .280 Ackley Improved
Select your desired cartridge and bullet weight below to access the corresponding load table. From there, you can choose any listed load recipe and transfer it directly into the ballistics calculator for further refinement, optimization, and precision tuning.
.284 | 145gr | Barnes LRX BT
.284 | 160gr | Nosler AccuBond
.284 | 162gr | Hornady ELD-X
.284 | 160gr | Hornady CX
.284 | 162gr | Hornady SST
.284 | 168gr | Sierra MatchKing
.284 | 150gr | Hornady CX
.284 | 140gr | Swift A-Frame
.284 | 175gr | Nosler AccuBond Long Range
.284 | 151gr | Warner Tool Co. Flat Line
.284 | 162gr | Hornady ELD Match
.284 | 150gr | Hornady ELD-X
.284 | 180gr | Berger VLD Hunting
.284 | 184gr | Berger F-Open Hybrid Target
.284 | 150gr | Osprey Virtus
.284 | 140gr | Barnes TTSX BT
.284 | 145gr | CutEdge MTH
.284 | 150gr | Remington PSP Core-Lokt
.284 | 155gr | Frontier PH HPFB
.284 | 150gr | Barnes X BT
.284 | 173gr | Sellier & Bellot SPCE
.284 | 171gr | Barnes Match Burner BT
.284 | 160gr | Nosler Ballistic Tip Hunting
.284 | 120gr | AERO SB.HSD 1.5 ,- smax:15.10
Community Loads — .280 Ackley Improved
Here are some popular loads for .280 Ackley Improved:
You need a PRO license to unlock and view all data.
| Bullet | Powder | Barrel (in) | Charge (gr) | Case Volume (GoW) | OAL (in) | Max. Pressure (psi) | Muzzle Velocity (fps) | |
|---|---|---|---|---|---|---|---|---|
.284 | 130gr | Speer Boat-Tail (130gr) | Vihtav N555 | 26.0 | 63.0 | 74.0 | 3.33 | 50,782 (78%) | 3130 | |
.284 | 130gr | Speer Boat-Tail (130gr) | Vihtav N560 | 26.0 | 63.0 | 74.0 | 3.33 | 42,131 (65%) | 2972 | |
.284 | 139gr | Barnes LRX BT (139gr) | Vihtav N560 | 26.0 | ••.• | 74.0 | 3.33 | 48,945 (75%) | 3018 | |
.284 | 139gr | Barnes LRX BT (139gr) | Allian Reloder-19 | 26.0 | 60.0 | 74.0 | 3.33 | 53,696 (83%) | 3045 | |
M.284 | 139gr | Hornady BTSP (139gr) | Winche 6.5 StaBall | 22.0 | ••.• | 74.0 | 3.33 | 64,092 (99%) | 3002 | |
.284 | 139gr | Hornady BTSP (139gr) | Winche 6.5 StaBall | 22.0 | ••.• | 74.0 | 3.33 | 47,355 (73%) | 2762 | |
.284 | 140gr | Berger VLD Hunting (140gr) | Hodgdo H4831 SC | 24.0 | ••.• | 74.0 | 3.33 | 48,312 (74%) | 2858 | |
.284 | 140gr | Berger VLD Hunting (140gr) | Hodgdo H4350 | 22.0 | ••.• | 74.0 | 3.33 | 52,069 (80%) | 2835 | |
M.284 | 140gr | Nosler AccuBond (140gr) | Vihtav N160 | 22.0 | ••.• | 72.4 | 3.33 | 62,888 (97%) | 2995 | |
M.284 | 140gr | Nosler AccuBond (140gr) | Hodgdo Hybrid 100V | 22.0 | ••.• | 74.0 | 3.33 | 61,627 (95%) | 2982 | |
M.284 | 140gr | Nosler AccuBond (140gr) | Hodgdo H4831 SC | 22.0 | ••.• | 71.3 | 3.33 | 62,236 (96%) | 2972 | |
.284 | 140gr | Nosler AccuBond (140gr) | Vihtav N555 | 22.0 | ••.• | 71.4 | 3.33 | 55,637 (86%) | 2959 | |
M.284 | 140gr | Nosler AccuBond (140gr) | Vihtav N160 | 22.0 | ••.• | 72.4 | 3.33 | 59,596 (92%) | 2953 | |
.284 | 140gr | Nosler AccuBond (140gr) | Hodgdo H4831 SC | 22.0 | ••.• | 71.4 | 3.33 | 58,218 (90%) | 2940 | |
M.284 | 140gr | Nosler AccuBond (140gr) | Hodgdo H4350 | 22.0 | ••.• | 71.4 | 3.28 | 59,321 (91%) | 2927 | |
.284 | 140gr | Nosler AccuBond (140gr) | Hodgdo H4350 | 22.0 | ••.• | 74.0 | 3.32 | 54,244 (83%) | 2867 | |
M.284 | 145gr | Barnes LRX BT (145gr) | Ramsho Hunter | 24.0 | ••.• | 74.0 | 3.28 | 60,771 (93%) | 3035 | |
M.284 | 145gr | Barnes LRX BT (145gr) | Hodgdo H4350 | 24.0 | ••.• | 74.0 | 3.33 | 64,817 (100%) | 3015 | |
M.284 | 145gr | Barnes LRX BT (145gr) | Ramsho Hunter | 24.0 | ••.• | 74.0 | 3.28 | 59,117 (91%) | 3012 | |
.284 | 145gr | Barnes LRX BT (145gr) | Hodgdo H4350 | 24.0 | ••.• | 74.0 | 3.33 | 57,493 (88%) | 2940 | |
M.284 | 145gr | Barnes LRX BT (145gr) | Hodgdo H4831 SC | 22.0 | ••.• | 74.0 | 3.33 | 58,682 (90%) | 2917 | |
.284 | 145gr | Barnes LRX BT (145gr) | Hodgdo H4350 | 24.0 | ••.• | 74.0 | 3.33 | 56,144 (86%) | 2884 | |
.284 | 145gr | Barnes LRX BT (145gr) | Hodgdo H4831 SC | 24.0 | ••.• | 74.0 | 3.28 | 52,344 (81%) | 2871 | |
.284 | 145gr | Barnes LRX BT (145gr) | Hodgdo H4350 | 22.0 | ••.• | 71.4 | 3.30 | 57,566 (89%) | 2871 |
Frequently Asked Questions
The maximum pressure for .280 Ackley Improved is 65,000 psi | 4,482 bar.
.280 Ackley Improved typically uses a Large Rifle (LR) primer.
The case capacity of .280 Ackley Improved is approximately 74 grains of water (H₂O).