Load data for .257 Weath. Mag. + 100gr 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 | 100gr | Partition
Cartridge:.257 Weath. Mag. load data
Case Length (L3):2.549" | 64.7 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.368" | 9.4 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:1:11.0
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Community Loads for .257 Weath. Mag. + 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) |
|---|---|---|---|---|---|
| 65.0 gr | 3.209" | 26.0" | 3347 fps | ••• | |
| 67.0 gr | 3.209" | 26.0" | 3434 fps | ••• | |
| 69.0 gr | 3.209" | 26.0" | 3524 fps | ••• | |
| ••• | 3.209" | 26.0" | 3345 fps | ••• | |
| ••• | 3.209" | 26.0" | 3436 fps | ••• | |
| ••• | 3.209" | 26.0" | 3528 fps | ••• | |
| ••• | 3.209" | 26.0" | 3419 fps | ••• | |
| ••• | 3.209" | 26.0" | 3506 fps | ••• | |
| ••• | 3.240" | 26.0" | 2943 fps | ••• | |
| ••• | 3.240" | 26.0" | 3285 fps | ••• | |
| ••• | 3.209" | 26.0" | 3334 fps | ••• | |
| ••• | 3.209" | 26.0" | 3432 fps | ••• | |
| ••• | 3.209" | 26.0" | 3528 fps | ••• | |
| ••• | 3.209" | 26.0" | 3187 fps | ••• | |
| ••• | 3.209" | 26.0" | 3281 fps | ••• | |
| ••• | 3.209" | 26.0" | 3372 fps | ••• | |
| ••• | 3.240" | 26.0" | 3166 fps | ••• | |
| ••• | 3.240" | 26.0" | 3537 fps | ••• | |
| ••• | 3.209" | 26.0" | 3211 fps | ••• | |
| ••• | 3.209" | 26.0" | 3297 fps | ••• | |
| ••• | 3.209" | 26.0" | 3380 fps | ••• | |
| ••• | 3.209" | 26.0" | 3390 fps | ••• | |
| ••• | 3.150" | — | 3446 fps | ••• | |
| ••• | 3.240" | 26.0" | 3123 fps | ••• | |
| ••• | 3.240" | 26.0" | 3483 fps | ••• | |
| ••• | 3.209" | 26.0" | 3233 fps | ••• | |
| ••• | 3.209" | 26.0" | 3321 fps | ••• | |
| ••• | 3.209" | 26.0" | 3405 fps | ••• | |
| ••• | 3.240" | 26.0" | 2936 fps | ••• | |
| ••• | 3.240" | 26.0" | 3278 fps | ••• | |
| ••• | 3.209" | 26.0" | 3292 fps | ••• | |
| ••• | 3.209" | 26.0" | 3375 fps | ••• | |
| ••• | 3.240" | 26.0" | 3310 fps | ••• | |
Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.