Load data for .257 Weath. Mag. + 87gr Sierra VarmintKing
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 | 87gr | VarmintKing
Cartridge:.257 Weath. Mag. load data
Case Length (L3):2.549" | 64.7 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.209" | 5.3 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:1:13.5
Get PRO license to unlock all data and calculators
Community Loads for .257 Weath. Mag. + 87gr Sierra VarmintKing
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 | 3.200" | 24.0" | 3242 fps | ••• | |
| 61.1 gr | 3.200" | 24.0" | 3366 fps | ••• | |
| 63.2 gr | 3.200" | 24.0" | 3463 fps | ••• | |
| ••• | 3.200" | 24.0" | 3542 fps | ••• | |
| ••• | 3.200" | 24.0" | 3187 fps | ••• | |
| ••• | 3.200" | 24.0" | 3297 fps | ••• | |
| ••• | 3.200" | 24.0" | 3395 fps | ••• | |
| ••• | 3.200" | 24.0" | 3478 fps | ••• | |
| ••• | 3.200" | 24.0" | 3546 fps | ••• | |
| ••• | 3.200" | 24.0" | 3609 fps | ••• | |
| ••• | 3.200" | 24.0" | 3220 fps | ••• | |
| ••• | 3.200" | 24.0" | 3291 fps | ••• | |
| ••• | 3.200" | 24.0" | 3372 fps | ••• | |
| ••• | 3.200" | 24.0" | 3455 fps | ••• | |
| ••• | 3.200" | 24.0" | 3250 fps | ••• | |
| ••• | 3.200" | 24.0" | 3325 fps | ••• | |
| ••• | 3.200" | 24.0" | 3403 fps | ••• | |
| ••• | 3.200" | 24.0" | 3470 fps | ••• | |
| ••• | 3.200" | 24.0" | 3526 fps | ••• | |
| ••• | 3.200" | 24.0" | 3244 fps | ••• | |
| ••• | 3.200" | 24.0" | 3326 fps | ••• | |
| ••• | 3.200" | 24.0" | 3408 fps | ••• | |
| ••• | 3.200" | 24.0" | 3329 fps | ••• | |
| ••• | 3.200" | 24.0" | 3447 fps | ••• | |
| ••• | 3.200" | 24.0" | 3227 fps | ••• | |
| ••• | 3.200" | 24.0" | 3323 fps | ••• | |
| ••• | 3.200" | 24.0" | 3426 fps | ••• | |
| ••• | 3.200" | 24.0" | 3530 fps | ••• | |
| ••• | 3.200" | 24.0" | 3010 fps | ••• | |
| ••• | 3.200" | 24.0" | 3041 fps | ••• | |
| ••• | 3.200" | 24.0" | 3083 fps | ••• | |
| ••• | 3.200" | 24.0" | 3257 fps | ••• | |
| ••• | 3.200" | 24.0" | 3217 fps | ••• | |
| ••• | 3.200" | 24.0" | 3330 fps | ••• | |
| ••• | 3.200" | 24.0" | 3424 fps | ••• | |
| ••• | 3.200" | 24.0" | 3501 fps | ••• | |
| ••• | 3.200" | 24.0" | 3567 fps | ••• | |
| ••• | 3.200" | 24.0" | 3108 fps | ••• | |
| ••• | 3.200" | 24.0" | 3181 fps | ••• | |
| ••• | 3.200" | 24.0" | 3260 fps | ••• | |
| ••• | 3.200" | 24.0" | 3336 fps | ••• | |
| ••• | 3.200" | 24.0" | 3144 fps | ••• | |
| ••• | 3.200" | 24.0" | 3224 fps | ••• | |
| ••• | 3.200" | 24.0" | 3305 fps | ••• | |
| ••• | 3.200" | 24.0" | 3383 fps | ••• | |
| ••• | 3.200" | 24.0" | 3469 fps | ••• | |
| ••• | 3.200" | 24.0" | 3225 fps | ••• | |
| ••• | 3.200" | 24.0" | 3295 fps | ••• | |
| ••• | 3.200" | 24.0" | 3367 fps | ••• | |
| ••• | 3.200" | 24.0" | 3437 fps | ••• | |
Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.