Load data for .257 Weath. Mag. + 90gr Hornady GMX
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 | 90gr | GMX
Cartridge:.257 Weath. Mag. load data
Case Length (L3):2.549" | 64.7 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.416" | 10.6 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
Get PRO license to unlock all data and calculators
Community Loads for .257 Weath. Mag. + 90gr Hornady GMX
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) |
|---|---|---|---|---|---|
| 59.9 gr | 3.180" | 26.0" | 3310 fps | ••• | |
| 66.6 gr | 3.180" | 26.0" | 3625 fps | ••• | |
| 67.5 gr | 3.180" | 26.0" | 3371 fps | ••• | |
| ••• | 3.180" | 26.0" | 3654 fps | ••• | |
| ••• | 3.180" | 26.0" | 3099 fps | ••• | |
| ••• | 3.180" | 26.0" | 3427 fps | ••• | |
| ••• | 3.180" | 26.0" | 3195 fps | ••• | |
| ••• | 3.180" | 26.0" | 3484 fps | ••• | |
Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.