Load data for .280 Ackley Improved + 140gr Sierra SBT GameKing
Based on SAAMI, the max. allowed case length is 2.525 in / 64.14 mm, the max. cartridge length is 3.330 in / 84.58 mm, and the max. allowed pressure is 65,000 PSI / 4,482 bar.
Based on SAAMI, the max. allowed case length is 2.525 in / 64.14 mm, the max. cartridge length is 3.330 in / 84.58 mm, and the max. allowed pressure is 65,000 PSI / 4,482 bar.
Load Specifications
ImperialMetric
Bullet:.284 | 140gr | SBT GameKing
Cartridge:.280 Ackley Improved load data
Case Length (L3):2.540" | 64.5 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.424" | 10.8 mm
Case Capacity:74 gow | 4.80 cm³
Primer Size:Large Rifle (LR)
Max. Pressure (SAAMI):65,000 psi | 4,482 bar
Barrel Length:24.0" | 610 mm
Min. Twist Rate:1:12.0
Get PRO license to unlock all data and calculators
Community Loads for .280 Ackley Improved + 140gr Sierra SBT 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) |
|---|---|---|---|---|---|
| 51.8 gr | 3.330" | 26.0" | 2729 fps | ••• | |
| 53.9 gr | 3.330" | 26.0" | 2828 fps | ••• | |
| 56.0 gr | 3.330" | 26.0" | 2923 fps | ••• | |
| ••• | 3.330" | 26.0" | 2798 fps | ••• | |
| ••• | 3.330" | 26.0" | 2854 fps | ••• | |
| ••• | 3.330" | 26.0" | 2912 fps | ••• | |
| ••• | 3.330" | 26.0" | 2630 fps | ••• | |
| ••• | 3.330" | 26.0" | 2702 fps | ••• | |
| ••• | 3.330" | 26.0" | 2725 fps | ••• | |
| ••• | 3.330" | 26.0" | 2819 fps | ••• | |
| ••• | 3.330" | 26.0" | 2862 fps | ••• | |
| ••• | 3.330" | 26.0" | 2910 fps | ••• | |
| ••• | 3.330" | 26.0" | 2726 fps | ••• | |
| ••• | 3.330" | 26.0" | 2811 fps | ••• | |
| ••• | 3.330" | 26.0" | 2830 fps | ••• | |
| ••• | 3.330" | 26.0" | 2896 fps | ••• | |
| ••• | 3.330" | 26.0" | 2930 fps | ••• | |
| ••• | 3.330" | 26.0" | 2977 fps | ••• | |
| ••• | 3.330" | 26.0" | 3059 fps | ••• | |
Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.