Load data for .257 Roberts + 75gr Sierra HP Varminter
Based on C.I.P., the max. allowed case length is 2.233 in / 56.72 mm, the max. cartridge length is 2.775 in / 70.49 mm, and the max. allowed pressure is 51,488 PSI / 3,550 bar.
Based on C.I.P., the max. allowed case length is 2.233 in / 56.72 mm, the max. cartridge length is 2.775 in / 70.49 mm, and the max. allowed pressure is 51,488 PSI / 3,550 bar.
Load Specifications
ImperialMetric
Bullet:.257 | 75gr | HP Varminter
Cartridge:.257 Roberts load data
Case Length (L3):2.233" | 56.7 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.275" | 7.0 mm
Case Capacity:58 gow | 3.76 cm³
Primer Size:Large Rifle (LR)
Max. Pressure (C.I.P.):51,488 psi | 3,550 bar
Barrel Length:24.0" | 610 mm
Min. Twist Rate:Stabilizes in any common twist
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Community Loads for .257 Roberts + 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) |
|---|---|---|---|---|---|
| 42.5 gr | 2.700" | 22.0" | 2894 fps | ••• | |
| 44.4 gr | 2.700" | 22.0" | 3014 fps | ••• | |
| 44.7 gr | 2.745" | 24.0" | 3088 fps | ••• | |
| ••• | 2.700" | 22.0" | 3129 fps | ••• | |
| ••• | 2.745" | 24.0" | 3234 fps | ••• | |
| ••• | 2.700" | 22.0" | 2920 fps | ••• | |
| ••• | 2.700" | 22.0" | 2985 fps | ••• | |
| ••• | 2.700" | 22.0" | 3050 fps | ••• | |
| ••• | 2.700" | 22.0" | 3116 fps | ••• | |
| ••• | 2.745" | 24.0" | 3225 fps | ••• | |
| ••• | 2.700" | 22.0" | 2847 fps | ••• | |
| ••• | 2.745" | 24.0" | 2930 fps | ••• | |
| ••• | 2.700" | 22.0" | 2945 fps | ••• | |
| ••• | 2.700" | 22.0" | 3045 fps | ••• | |
| ••• | 2.700" | 22.0" | 3144 fps | ••• | |
| ••• | 2.745" | 24.0" | 3276 fps | ••• | |
| ••• | 2.700" | 22.0" | 2956 fps | ••• | |
| ••• | 2.700" | 22.0" | 3031 fps | ••• | |
| ••• | 2.775" | 24.0" | 3109 fps | ••• | |
| ••• | 2.700" | 22.0" | 3137 fps | ••• | |
| ••• | 2.700" | 22.0" | 2964 fps | ••• | |
| ••• | 2.700" | 22.0" | 3064 fps | ••• | |
| ••• | 2.700" | 22.0" | 3164 fps | ••• | |
| ••• | 2.700" | 22.0" | 2970 fps | ••• | |
| ••• | 2.700" | 22.0" | 3053 fps | ••• | |
| ••• | 2.700" | 22.0" | 3133 fps | ••• | |
| ••• | 2.700" | 22.0" | 3221 fps | ••• | |
| ••• | 2.700" | 22.0" | 3298 fps | ••• | |
| ••• | 2.700" | 22.0" | 3013 fps | ••• | |
| ••• | 2.700" | 22.0" | 3067 fps | ••• | |
| ••• | 2.700" | 22.0" | 3120 fps | ••• | |
| ••• | 2.700" | 22.0" | 3085 fps | ••• | |
| ••• | 2.700" | 22.0" | 3165 fps | ••• | |
| ••• | 2.775" | 22.0" | 3268 fps | ••• | |
| ••• | 2.775" | 22.0" | 3333 fps | ••• | |
| ••• | 2.700" | 22.0" | 2965 fps | ••• | |
| ••• | 2.700" | 22.0" | 3041 fps | ••• | |
| ••• | 2.700" | 22.0" | 3105 fps | ••• | |
| ••• | 2.700" | 22.0" | 3112 fps | ••• | |
| ••• | 2.700" | 22.0" | 3232 fps | ••• | |
| ••• | 2.700" | 22.0" | 2998 fps | ••• | |
| ••• | 2.700" | 22.0" | 3070 fps | ••• | |
| ••• | 2.700" | 22.0" | 3142 fps | ••• | |
| ••• | 2.745" | 24.0" | 2812 fps | ••• | |
| ••• | 2.745" | 24.0" | 3007 fps | ••• | |
| ••• | 2.745" | 24.0" | 3142 fps | ••• | |
| ••• | 2.700" | 22.0" | 3012 fps | ••• | |
| ••• | 2.700" | 22.0" | 3087 fps | ••• | |
| ••• | 2.700" | 22.0" | 2885 fps | ••• | |
| ••• | 2.700" | 22.0" | 2965 fps | ••• | |
| ••• | 2.700" | 22.0" | 3052 fps | ••• | |
| ••• | 2.700" | 22.0" | 3132 fps | ••• | |
Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.