Load data for .257 Weath. Mag. + 120gr Nosler Partition
The most recommended powders for this combination are Alliant Reloder-25.
Based on C.I.P., the max. allowed case length is 2.549 in / 64.74 mm, the max. cartridge length is 3.209 in / 81.51 mm, and the max. allowed pressure is 63,817 PSI / 4,400 bar.
Based on C.I.P., the max. allowed case length is 2.549 in / 64.74 mm, the max. cartridge length is 3.209 in / 81.51 mm, and the max. allowed pressure is 63,817 PSI / 4,400 bar.
Load Specifications
ImperialMetric
Bullet:.257 | 120gr | Partition
Cartridge:.257 Weath. Mag. load data
Case Length (L3):2.549" | 64.7 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.509" | 12.9 mm
Case Capacity:84 gow | 5.44 cm³
Primer Size:Large Rifle Magnum (LRM)
Max. Pressure (C.I.P.):63,817 psi | 4,400 bar
Barrel Length:26.0" | 660 mm
Min. Twist Rate:1:10.0
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Community Loads for .257 Weath. Mag. + 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) |
|---|---|---|---|---|---|
| 67.0 gr | 3.240" | 26.0" | 3202 fps | ••• | |
| 61.0 gr | 3.209" | 26.0" | 3100 fps | ••• | |
| 63.0 gr | 3.209" | 26.0" | 3184 fps | ••• | |
| ••• | 3.209" | 26.0" | 3266 fps | ••• | |
| ••• | 3.209" | 26.0" | 3112 fps | ••• | |
| ••• | 3.209" | 26.0" | 3196 fps | ••• | |
| ••• | 3.209" | 26.0" | 3283 fps | ••• | |
| ••• | 3.209" | 26.0" | 3184 fps | ••• | |
| ••• | 3.209" | 26.0" | 3265 fps | ••• | |
| ••• | 3.209" | 26.0" | 3048 fps | ••• | |
| ••• | 3.209" | 26.0" | 3139 fps | ••• | |
| ••• | 3.209" | 26.0" | 3228 fps | ••• | |
| ••• | 3.209" | 26.0" | 2999 fps | ••• | |
| ••• | 3.209" | 26.0" | 3081 fps | ••• | |
| ••• | 3.209" | 26.0" | 3125 fps | ••• | |
| ••• | 3.209" | 26.0" | 3203 fps | ••• | |
| ••• | 3.209" | 26.0" | 3088 fps | ••• | |
| ••• | 3.209" | 26.0" | 3167 fps | ••• | |
| ••• | 3.240" | 26.0" | 2788 fps | ••• | |
| ••• | 3.240" | 26.0" | 3151 fps | ••• | |
| ••• | 3.240" | 26.0" | 2759 fps | ••• | |
| ••• | 3.240" | 26.0" | 3061 fps | ••• | |
| ••• | 3.209" | 26.0" | 2969 fps | ••• | |
| ••• | 3.209" | 26.0" | 3049 fps | ••• | |
| ••• | 3.209" | 26.0" | 3129 fps | ••• | |
| ••• | 3.209" | 26.0" | 3200 fps | ••• | |
| ••• | 3.209" | 26.0" | 3291 fps | ••• | |
Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.