Load data for .257 Weath. Mag. + 100gr Speer Boat-Tail
461 suitable loads across 74 powder(s) for cartridge .257 Weath. Mag. with 100gr Speer Boat-Tail bullet.
The most recommended powders for this combination are Accurate High Country, Winchester StaBALL HD and IMR 7828 SSC.
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
Get PRO license to unlock all data and calculators
Community Loads for .257 Weath. Mag. + 100gr Speer Boat-Tail
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 | 3.150" | — | 3140 fps | ••• | |
| 67.0 gr | 3.150" | — | 3239 fps | ••• | |
| 63.0 gr | 3.200" | 26.0" | 3264 fps | ••• | |
| ••• | 3.200" | 26.0" | 3373 fps | ••• | |
| ••• | 3.200" | 26.0" | 3355 fps | ••• | |
| ••• | 3.150" | — | 3162 fps | ••• | |
| ••• | 3.150" | — | 3344 fps | ••• | |
| ••• | 3.150" | — | 3203 fps | ••• | |
| ••• | 3.150" | — | 3389 fps | ••• | |
| ••• | 3.150" | — | 3169 fps | ••• | |
| ••• | 3.150" | — | 3461 fps | ••• | |
| ••• | 3.150" | — | 3327 fps | ••• | |
| ••• | 3.150" | — | 3502 fps | ••• | |
| ••• | 3.150" | — | 3127 fps | ••• | |
| ••• | 3.150" | — | 3456 fps | ••• | |
| ••• | 3.150" | — | 3110 fps | ••• | |
| ••• | 3.150" | — | 3512 fps | ••• | |
| ••• | 3.122" | 26.0" | 3451 fps | ••• | |
| ••• | 3.150" | — | 3210 fps | ••• | |
| ••• | 3.150" | — | 3308 fps | ••• | |
| ••• | 3.200" | 26.0" | 3387 fps | ••• | |
| ••• | 3.200" | 26.0" | 3357 fps | ••• | |
| ••• | 3.200" | 26.0" | 3435 fps | ••• | |
| ••• | 3.200" | 26.0" | 3170 fps | ••• | |
| ••• | 3.200" | 26.0" | 3355 fps | ••• | |
| ••• | 3.122" | 26.0" | 3402 fps | ••• | |
| ••• | 3.150" | — | 3449 fps | ••• | |
| ••• | 3.150" | — | 3546 fps | ••• | |
| ••• | 3.150" | — | 3087 fps | ••• | |
| ••• | 3.150" | — | 3186 fps | ••• | |
| ••• | 3.150" | — | 3372 fps | ••• | |
| ••• | 3.150" | — | 3226 fps | ••• | |
| ••• | 3.150" | — | 3319 fps | ••• | |
| ••• | 3.150" | — | 3267 fps | ••• | |
| ••• | 3.150" | — | 3334 fps | ••• | |
| ••• | 3.150" | — | 3430 fps | ••• | |
Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.