Load data for .257 Weath. Mag. + 75gr Sierra HP Varminter
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 | 75gr | HP Varminter
Cartridge:.257 Weath. Mag. load data
Case Length (L3):2.549" | 64.7 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.175" | 4.4 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:Stabilizes in any common twist
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Community Loads for .257 Weath. Mag. + 75gr Sierra HP Varminter
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) |
|---|---|---|---|---|---|
| 64.8 gr | 3.125" | 24.0" | 3545 fps | ••• | |
| 70.1 gr | 3.125" | 24.0" | 3366 fps | ••• | |
| 73.6 gr | 3.125" | 24.0" | 3553 fps | ••• | |
| ••• | 3.125" | 24.0" | 3690 fps | ••• | |
| ••• | 3.125" | 24.0" | 3773 fps | ••• | |
| ••• | 3.125" | 24.0" | 3811 fps | ••• | |
| ••• | 3.125" | 24.0" | 3563 fps | ••• | |
| ••• | 3.125" | 24.0" | 3098 fps | ••• | |
| ••• | 3.125" | 24.0" | 3220 fps | ••• | |
| ••• | 3.125" | 24.0" | 3331 fps | ••• | |
| ••• | 3.125" | 24.0" | 3427 fps | ••• | |
| ••• | 3.125" | 24.0" | 3514 fps | ••• | |
| ••• | 3.125" | 24.0" | 3584 fps | ••• | |
Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.