Load data for .257 Ackley Improved + 120gr 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 | 120gr | Partition
Cartridge:.257 Ackley Improved load data
Case Length (L3):2.333" | 59.3 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.728" | 18.5 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
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Community Loads for .257 Ackley Improved + 120gr 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) |
|---|---|---|---|---|---|
| 43.5 gr | 2.780" | 24.0" | 2646 fps | ••• | |
| 45.5 gr | 2.780" | 24.0" | 2762 fps | ••• | |
| 43.5 gr | 2.780" | 24.0" | 2544 fps | ••• | |
| ••• | 2.780" | 24.0" | 2663 fps | ••• | |
| ••• | 2.780" | 24.0" | 2780 fps | ••• | |
| ••• | 2.780" | 24.0" | 2755 fps | ••• | |
| ••• | 2.780" | 24.0" | 2713 fps | ••• | |
| ••• | 2.780" | 24.0" | 2627 fps | ••• | |
| ••• | 2.780" | 24.0" | 2737 fps | ••• | |
| ••• | 2.780" | 24.0" | 2693 fps | ••• | |
| ••• | 2.780" | 24.0" | 2804 fps | ••• | |
| ••• | 2.780" | 24.0" | 2722 fps | ••• | |
| ••• | 2.780" | 24.0" | 2702 fps | ••• | |
| ••• | 2.780" | 24.0" | 2827 fps | ••• | |
Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.