Load data for .257 Ackley Improved + 115gr Nosler Partition
The most recommended powders for this combination are Alliant Reloder-19.
Based on Wildcat, the max. allowed case length is 2.233 in / 56.72 mm, the max. cartridge length is 2.775 in / 70.49 mm, and the max. allowed pressure is 48,200 PSI / 3,323 bar.
Based on Wildcat, the max. allowed case length is 2.233 in / 56.72 mm, the max. cartridge length is 2.775 in / 70.49 mm, and the max. allowed pressure is 48,200 PSI / 3,323 bar.
Load Specifications
ImperialMetric
Bullet:.257 | 115gr | Partition
Cartridge:.257 Ackley Improved load data
Case Length (L3):2.333" | 59.3 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.688" | 17.5 mm
Case Capacity:63 gow | 4.08 cm³
Primer Size:Large Rifle (LR)
Max. Pressure (Wildcat):48,200 psi | 3,323 bar
Barrel Length:24.0" | 610 mm
Min. Twist Rate:1:10.0
Get PRO license to unlock all data and calculators
Community Loads for .257 Ackley Improved + 115gr Nosler Partition
Real loads for this combination shared by our community. Charge weights are only fully visible with an active Pro licence.
| Powder | Charge (gr) | C.O.L. | Barrel Length | Velocity (fps) | Pressure (psi) |
|---|---|---|---|---|---|
| 40.5 gr | 2.780" | 24.0" | 2625 fps | ••• | |
| 42.5 gr | 2.780" | 24.0" | 2744 fps | ••• | |
| 44.5 gr | 2.780" | 24.0" | 2860 fps | ••• | |
| ••• | 2.945" | 24.0" | 2816 fps | ••• | |
| ••• | 2.780" | 24.0" | 2652 fps | ••• | |
| ••• | 2.780" | 24.0" | 2768 fps | ••• | |
| ••• | 2.780" | 24.0" | 2718 fps | ••• | |
| ••• | 2.780" | 24.0" | 2836 fps | ••• | |
| ••• | 2.780" | 24.0" | 2639 fps | ••• | |
| ••• | 2.780" | 24.0" | 2750 fps | ••• | |
| ••• | 2.780" | 24.0" | 2651 fps | ••• | |
| ••• | 2.780" | 24.0" | 2764 fps | ••• | |
| ••• | 2.780" | 24.0" | 2701 fps | ••• | |
| ••• | 2.780" | 24.0" | 2816 fps | ••• | |
| ••• | 2.780" | 24.0" | 2792 fps | ••• | |
| ••• | 2.780" | 24.0" | 2641 fps | ••• | |
| ••• | 2.780" | 24.0" | 2757 fps | ••• | |
| ••• | 2.780" | 24.0" | 2874 fps | ••• | |
Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.