Load data for .257 Ackley Improved + 100gr Sierra GameKing
Based on Wildcat, 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 48,200 PSI / 3,323 bar.
Based on Wildcat, 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 48,200 PSI / 3,323 bar.
Load Specifications
ImperialMetric
Bullet:.257 | 100gr | GameKing
Cartridge:.257 Ackley Improved load data
Case Length (L3):2.333" | 59.3 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.551" | 14.0 mm
Case Capacity:63 gow | 4.08 cm³
Primer Size:Large Rifle (LR)
Max. Pressure (Wildcat):48,200 psi | 3,323 bar
Barrel Length:24.0" | 610 mm
Min. Twist Rate:1:11.5
Get PRO license to unlock all data and calculators
Community Loads for .257 Ackley Improved + 100gr Sierra GameKing
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) |
|---|---|---|---|---|---|
| 46.0 gr | 2.775" | 26.0" | 3017 fps | ••• | |
| 47.3 gr | 2.775" | 26.0" | 3096 fps | ••• | |
| 45.8 gr | 2.775" | 26.0" | 2838 fps | ••• | |
| ••• | 2.775" | 26.0" | 2976 fps | ••• | |
| ••• | 2.775" | 26.0" | 3113 fps | ••• | |
| ••• | 2.775" | 26.0" | 3011 fps | ••• | |
| ••• | 2.775" | 26.0" | 2917 fps | ••• | |
| ••• | 2.775" | 26.0" | 2997 fps | ••• | |
| ••• | 2.775" | 26.0" | 3051 fps | ••• | |
Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.