Load data for .338-06 A-Square + 250gr Speer Grand Slam
Based on SAAMI, the max. allowed case length is 2.494 in / 63.35 mm, the max. cartridge length is 3.340 in / 84.84 mm, and the max. allowed pressure is 63,092 PSI / 4,350 bar.

Based on SAAMI, the max. allowed case length is 2.494 in / 63.35 mm, the max. cartridge length is 3.340 in / 84.84 mm, and the max. allowed pressure is 63,092 PSI / 4,350 bar.

Load Specifications
ImperialMetric
Bullet:.338 | 250gr | Grand Slam
Cartridge:.338-06 A-Square load data
Case Length (L3):2.494" | 63.3 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.384" | 9.8 mm
Case Capacity:69 gow | 4.47 cm³
Primer Size:Large Rifle (LR)
Max. Pressure (SAAMI):63,092 psi | 4,350 bar
Barrel Length:24.0" | 610 mm
Min. Twist Rate:1:6.0
Get PRO license to unlock all data and calculators
Community Loads for .338-06 A-Square + 250gr Speer Grand Slam
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) |
|---|---|---|---|---|---|
| 56.0 gr | 3.340" | — | 2175 fps | ••• | |
| 60.0 gr | 3.340" | — | 2340 fps | ••• | |
| 46.0 gr | 3.340" | — | 2210 fps | ••• | |
| ••• | 3.340" | — | 2369 fps | ••• | |
| ••• | 3.340" | — | 2341 fps | ••• | |
| ••• | 3.340" | — | 2506 fps | ••• | |
| ••• | 3.340" | — | 2289 fps | ••• | |
| ••• | 3.340" | — | 2453 fps | ••• | |
| ••• | 3.340" | — | 2380 fps | ••• | |
| ••• | 3.340" | — | 2267 fps | ••• | |
| ••• | 3.340" | — | 2437 fps | ••• | |
| ••• | 3.340" | — | 2239 fps | ••• | |
| ••• | 3.340" | — | 2394 fps | ••• | |
| ••• | 3.340" | — | 2283 fps | ••• | |
| ••• | 3.340" | — | 2440 fps | ••• | |
| ••• | 3.340" | — | 2372 fps | ••• | |
| ••• | 3.340" | — | 2528 fps | ••• | |
| ••• | 3.340" | — | 2338 fps | ••• | |
| ••• | 3.340" | — | 2494 fps | ••• | |
| ••• | 3.340" | — | 2267 fps | ••• | |
| ••• | 3.340" | — | 2433 fps | ••• | |
| ••• | 3.340" | — | 2220 fps | ••• | |
| ••• | 3.340" | — | 2378 fps | ••• | |
Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.