Load data for .257 Weath. Mag. + 70gr Sierra Tipped 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
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:1:11.5
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Community Loads for .257 Weath. Mag. + 70gr Sierra Tipped 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) |
|---|---|---|---|---|---|
| 64.4 gr | 3.170" | 26.0" | 3640 fps | ••• | |
| 71.9 gr | 3.170" | 26.0" | 3532 fps | ••• | |
| 79.9 gr | 3.170" | 26.0" | 3962 fps | ••• | |
| ••• | 3.125" | 24.0" | 3474 fps | ••• | |
| ••• | 3.125" | 24.0" | 3618 fps | ••• | |
| ••• | 3.125" | 24.0" | 3416 fps | ••• | |
| ••• | 3.125" | 24.0" | 3614 fps | ••• | |
| ••• | 3.125" | 24.0" | 3760 fps | ••• | |
| ••• | 3.125" | 24.0" | 3847 fps | ••• | |
| ••• | 3.125" | 24.0" | 3883 fps | ••• | |
| ••• | 3.125" | 24.0" | 3471 fps | ••• | |
| ••• | 3.125" | 24.0" | 3579 fps | ••• | |
| ••• | 3.125" | 24.0" | 3072 fps | ••• | |
| ••• | 3.125" | 24.0" | 3263 fps | ••• | |
| ••• | 3.125" | 24.0" | 3375 fps | ••• | |
| ••• | 3.125" | 24.0" | 3498 fps | ••• | |
| ••• | 3.125" | 24.0" | 3632 fps | ••• | |
| ••• | 3.125" | 24.0" | 3146 fps | ••• | |
| ••• | 3.125" | 24.0" | 3269 fps | ••• | |
| ••• | 3.125" | 24.0" | 3385 fps | ••• | |
| ••• | 3.125" | 24.0" | 3484 fps | ••• | |
| ••• | 3.125" | 24.0" | 3573 fps | ••• | |
| ••• | 3.125" | 24.0" | 3644 fps | ••• | |
| ••• | 3.170" | 26.0" | 3339 fps | ••• | |
| ••• | 3.170" | 26.0" | 3785 fps | ••• | |
Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.