Load data for .257 Weath. Mag. + 100gr Sierra MatchKing
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 | MatchKing
Cartridge:.257 Weath. Mag. load data
Case Length (L3):2.549" | 64.7 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.510" | 12.9 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:1:10.5
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Community Loads for .257 Weath. Mag. + 100gr Sierra MatchKing
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) |
|---|---|---|---|---|---|
| 57.6 gr | 3.170" | 24.0" | 3188 fps | ••• | |
| 60.0 gr | 3.170" | 24.0" | 3297 fps | ••• | |
| 62.0 gr | 3.170" | 24.0" | 3095 fps | ••• | |
| ••• | 3.170" | 24.0" | 3203 fps | ••• | |
| ••• | 3.170" | 24.0" | 3097 fps | ••• | |
| ••• | 3.170" | 24.0" | 3197 fps | ••• | |
| ••• | 3.170" | 24.0" | 3299 fps | ••• | |
| ••• | 3.170" | 24.0" | 3340 fps | ••• | |
| ••• | 3.170" | 24.0" | 3388 fps | ••• | |
| ••• | 3.170" | 24.0" | 2997 fps | ••• | |
| ••• | 3.170" | 24.0" | 3121 fps | ••• | |
| ••• | 3.170" | 24.0" | 3245 fps | ••• | |
| ••• | 3.170" | 24.0" | 3305 fps | ••• | |
| ••• | 3.170" | 24.0" | 3360 fps | ••• | |
| ••• | 3.170" | 24.0" | 3165 fps | ••• | |
| ••• | 3.170" | 24.0" | 3286 fps | ••• | |
| ••• | 3.170" | 24.0" | 2952 fps | ••• | |
| ••• | 3.170" | 24.0" | 3076 fps | ••• | |
| ••• | 3.170" | 24.0" | 3196 fps | ••• | |
| ••• | 3.170" | 24.0" | 3306 fps | ••• | |
| ••• | 3.170" | 24.0" | 3354 fps | ••• | |
| ••• | 3.170" | 24.0" | 2885 fps | ••• | |
| ••• | 3.170" | 24.0" | 2989 fps | ••• | |
| ••• | 3.170" | 24.0" | 3090 fps | ••• | |
| ••• | 3.170" | 24.0" | 3185 fps | ••• | |
| ••• | 3.170" | 24.0" | 3227 fps | ••• | |
| ••• | 3.170" | 24.0" | 2845 fps | ••• | |
| ••• | 3.170" | 24.0" | 2945 fps | ••• | |
| ••• | 3.170" | 24.0" | 3045 fps | ••• | |
| ••• | 3.170" | 24.0" | 3151 fps | ••• | |
| ••• | 3.170" | 24.0" | 3201 fps | ••• | |
| ••• | 3.170" | 24.0" | 3328 fps | ••• | |
| ••• | 3.170" | 24.0" | 3359 fps | ••• | |
Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.