Load data for .257 Weath. Mag. + 90gr Sierra GameKing
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 | 90gr | GameKing
Cartridge:.257 Weath. Mag. load data
Case Length (L3):2.549" | 64.7 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.289" | 7.3 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:1:13.0
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Community Loads for .257 Weath. Mag. + 90gr Sierra GameKing
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) |
|---|---|---|---|---|---|
| 58.5 gr | 3.150" | 24.0" | 3238 fps | ••• | |
| 61.1 gr | 3.150" | 24.0" | 3360 fps | ••• | |
| 63.2 gr | 3.150" | 24.0" | 3455 fps | ••• | |
| ••• | 3.150" | 24.0" | 3187 fps | ••• | |
| ••• | 3.150" | 24.0" | 3294 fps | ••• | |
| ••• | 3.150" | 24.0" | 3392 fps | ••• | |
| ••• | 3.150" | 24.0" | 3478 fps | ••• | |
| ••• | 3.150" | 24.0" | 3545 fps | ••• | |
| ••• | 3.150" | 24.0" | 3218 fps | ••• | |
| ••• | 3.150" | 24.0" | 3291 fps | ••• | |
| ••• | 3.150" | 24.0" | 3366 fps | ••• | |
| ••• | 3.150" | 24.0" | 3451 fps | ••• | |
| ••• | 3.150" | 24.0" | 3260 fps | ••• | |
| ••• | 3.150" | 24.0" | 3332 fps | ••• | |
| ••• | 3.150" | 24.0" | 3408 fps | ••• | |
| ••• | 3.150" | 24.0" | 3473 fps | ••• | |
| ••• | 3.150" | 24.0" | 3256 fps | ••• | |
| ••• | 3.150" | 24.0" | 3335 fps | ••• | |
| ••• | 3.150" | 24.0" | 3416 fps | ••• | |
| ••• | 3.150" | 26.0" | 3553 fps | ••• | |
| ••• | 3.150" | 24.0" | 3496 fps | ••• | |
| ••• | 3.150" | 26.0" | 3380 fps | ••• | |
| ••• | 3.150" | 24.0" | 3322 fps | ••• | |
| ••• | 3.150" | 26.0" | 3466 fps | ••• | |
| ••• | 3.150" | 24.0" | 3441 fps | ••• | |
| ••• | 3.150" | 26.0" | 3338 fps | ••• | |
| ••• | 3.150" | 24.0" | 3230 fps | ••• | |
| ••• | 3.150" | 24.0" | 3325 fps | ••• | |
| ••• | 3.150" | 24.0" | 3427 fps | ••• | |
| ••• | 3.150" | 24.0" | 3009 fps | ••• | |
| ••• | 3.150" | 24.0" | 3040 fps | ••• | |
| ••• | 3.150" | 24.0" | 3082 fps | ••• | |
| ••• | 3.150" | 24.0" | 3255 fps | ••• | |
| ••• | 3.150" | 24.0" | 3223 fps | ••• | |
| ••• | 3.150" | 24.0" | 3336 fps | ••• | |
| ••• | 3.150" | 24.0" | 3433 fps | ••• | |
| ••• | 3.150" | 24.0" | 3504 fps | ••• | |
| ••• | 3.150" | 24.0" | 3569 fps | ••• | |
| ••• | 3.150" | 24.0" | 3110 fps | ••• | |
| ••• | 3.150" | 24.0" | 3184 fps | ••• | |
| ••• | 3.150" | 24.0" | 3262 fps | ••• | |
| ••• | 3.150" | 24.0" | 3339 fps | ••• | |
| ••• | 3.150" | 24.0" | 3153 fps | ••• | |
| ••• | 3.150" | 24.0" | 3235 fps | ••• | |
| ••• | 3.150" | 24.0" | 3312 fps | ••• | |
| ••• | 3.150" | 24.0" | 3393 fps | ••• | |
| ••• | 3.150" | 24.0" | 3223 fps | ••• | |
| ••• | 3.150" | 24.0" | 3297 fps | ••• | |
| ••• | 3.150" | 24.0" | 3368 fps | ••• | |
| ••• | 3.150" | 24.0" | 3433 fps | ••• | |
Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.