Load data for .338-378 Weath. Mag. + 250gr Sierra GameKing
Based on C.I.P., the max. allowed case length is 2.913 in / 73.99 mm, the max. cartridge length is 3.763 in / 95.58 mm, and the max. allowed pressure is 63,817 PSI / 4,400 bar.
Based on C.I.P., the max. allowed case length is 2.913 in / 73.99 mm, the max. cartridge length is 3.763 in / 95.58 mm, and the max. allowed pressure is 63,817 PSI / 4,400 bar.
Load Specifications
ImperialMetric
Bullet:.338 | 250gr | GameKing
Cartridge:.338-378 Weath. Mag. load data
Case Length (L3):2.910" | 73.9 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.651" | 16.5 mm
Case Capacity:137 gow | 8.88 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:1:14.0
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Community Loads for .338-378 Weath. Mag. + 250gr 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) |
|---|---|---|---|---|---|
| 90.5 gr | 3.750" | 24.0" | 2568 fps | ••• | |
| 92.6 gr | 3.750" | 24.0" | 2614 fps | ••• | |
| 94.6 gr | 3.750" | 24.0" | 2658 fps | ••• | |
| ••• | 3.750" | 24.0" | 2512 fps | ••• | |
| ••• | 3.750" | 24.0" | 2580 fps | ••• | |
| ••• | 3.750" | 24.0" | 2585 fps | ••• | |
| ••• | 3.750" | 24.0" | 2633 fps | ••• | |
| ••• | 3.750" | 24.0" | 2691 fps | ••• | |
| ••• | 3.750" | 24.0" | 2746 fps | ••• | |
| ••• | 3.750" | 24.0" | 2799 fps | ••• | |
| ••• | 3.750" | 24.0" | 2711 fps | ••• | |
| ••• | 3.750" | 24.0" | 2811 fps | ••• | |
| ••• | 3.750" | 24.0" | 2873 fps | ••• | |
| ••• | 3.750" | 24.0" | 2385 fps | ••• | |
| ••• | 3.750" | 24.0" | 2447 fps | ••• | |
| ••• | 3.750" | 24.0" | 2497 fps | ••• | |
| ••• | 3.750" | 24.0" | 2519 fps | ••• | |
| ••• | 3.750" | 24.0" | 2538 fps | ••• | |
| ••• | 3.750" | 24.0" | 2627 fps | ••• | |
| ••• | 3.750" | 24.0" | 2671 fps | ••• | |
| ••• | 3.750" | 24.0" | 2710 fps | ••• | |
| ••• | 3.750" | 24.0" | 2500 fps | ••• | |
| ••• | 3.750" | 24.0" | 2541 fps | ••• | |
| ••• | 3.750" | 24.0" | 2583 fps | ••• | |
| ••• | 3.750" | 24.0" | 2627 fps | ••• | |
| ••• | 3.750" | 24.0" | 2673 fps | ••• | |
| ••• | 3.750" | 24.0" | 2720 fps | ••• | |
| ••• | 3.750" | 24.0" | 2387 fps | ••• | |
| ••• | 3.750" | 24.0" | 2427 fps | ••• | |
| ••• | 3.750" | 24.0" | 2457 fps | ••• | |
| ••• | 3.750" | 24.0" | 2487 fps | ••• | |
| ••• | 3.750" | 24.0" | 2516 fps | ••• | |
| ••• | 3.750" | 24.0" | 2545 fps | ••• | |
| ••• | 3.750" | 24.0" | 2597 fps | ••• | |
| ••• | 3.750" | 24.0" | 2646 fps | ••• | |
| ••• | 3.750" | 24.0" | 2689 fps | ••• | |
| ••• | 3.750" | 24.0" | 2504 fps | ••• | |
| ••• | 3.750" | 24.0" | 2688 fps | ••• | |
| ••• | 3.750" | 24.0" | 2513 fps | ••• | |
| ••• | 3.750" | 24.0" | 2526 fps | ••• | |
| ••• | 3.750" | 24.0" | 2569 fps | ••• | |
| ••• | 3.750" | 24.0" | 2572 fps | ••• | |
| ••• | 3.750" | 24.0" | 2623 fps | ••• | |
| ••• | 3.750" | 24.0" | 2669 fps | ••• | |
| ••• | 3.750" | 24.0" | 2717 fps | ••• | |
Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.