Load data for .257 Ackley Improved + 100gr Nosler Partition
The most recommended powders for this combination are IMR 4350.
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 | 100gr | Partition
Cartridge:.257 Ackley Improved load data
Case Length (L3):2.333" | 59.3 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.516" | 13.1 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:1:11.0
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Community Loads for .257 Ackley Improved + 100gr 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) |
|---|---|---|---|---|---|
| 41.0 gr | 2.780" | 24.0" | 2927 fps | ••• | |
| 45.5 gr | 2.780" | 24.0" | 2781 fps | ••• | |
| 47.5 gr | 2.780" | 24.0" | 2901 fps | ••• | |
| ••• | 2.780" | 24.0" | 3021 fps | ••• | |
| ••• | 2.780" | 24.0" | 2961 fps | ••• | |
| ••• | 2.780" | 24.0" | 2903 fps | ••• | |
| ••• | 2.780" | 24.0" | 2925 fps | ••• | |
| ••• | 2.780" | 24.0" | 2896 fps | ••• | |
| ••• | 2.780" | 24.0" | 3013 fps | ••• | |
| ••• | 2.780" | 24.0" | 2972 fps | ••• | |
| ••• | 2.780" | 24.0" | 2778 fps | ••• | |
| ••• | 2.780" | 24.0" | 2898 fps | ••• | |
| ••• | 2.780" | 24.0" | 3019 fps | ••• | |
Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.