Load Specifications
Load data in caliber .338 Win Mag. with .338 | 250gr | Woodleigh RN SN bullet and 103 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-16 and Hodgdon Superformance.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 84% | 53,751 psi | 86% | 2438 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,376 psi | 89% | 2500 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,776 psi | 77% | 2480 fps | 99% |
| Accurate 4064 | <<locked>> | 86% | 53,809 psi | 86% | 2484 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,954 psi | 87% | 2579 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 53,330 psi | 86% | 2510 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,375 psi | 87% | 2513 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,114 psi | 88% | 2615 fps | 98.1% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,535 psi | 89% | 2503 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,171 psi | 85% | 2625 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,810 psi | 88% | 2533 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,390 psi | 89% | 2559 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,694 psi | 88% | 2628 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,898 psi | 90% | 2654 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,128 psi | 87% | 2605 fps | 98.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 47,572 psi | 76% | 2549 fps | 97% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,034 psi | 72% | 2503 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,450 psi | 63% | 2425 fps | 98.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,778 psi | 81% | 2667 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,011 psi | 85% | 2526 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 43,772 psi | 70% | 2484 fps | 95.8% |
| Bofors RP3 | <<locked>> | 88% | 55,521 psi | 89% | 2549 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 47,572 psi | 76% | 2549 fps | 97% |
| Bofors RP7 | <<locked>> | 92% | 55,303 psi | 89% | 2536 fps | 98.9% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,288 psi | 89% | 2536 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,231 psi | 90% | 2566 fps | 100% |
| Hodgdon H414 | <<locked>> | 94% | 56,362 psi | 90% | 2628 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 90% | 52,982 psi | 85% | 2539 fps | 98.1% |
| Hodgdon H4895 | <<locked>> | 82% | 53,882 psi | 86% | 2516 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,766 psi | 88% | 2556 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,795 psi | 86% | 2552 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 52,678 psi | 84% | 2612 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,027 psi | 58% | 1535 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,114 psi | 88% | 2520 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,462 psi | 87% | 2497 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,070 psi | 87% | 2500 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,417 psi | 86% | 2484 fps | 99% |
| IMR 4350 | <<locked>> | 96% | 55,753 psi | 89% | 2566 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,635 psi | 86% | 2513 fps | 99% |
| IMR 4831 | <<locked>> | 96% | 54,230 psi | 87% | 2569 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 53,171 psi | 85% | 2533 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 54,737 psi | 88% | 2549 fps | 96.4% |
| IMR 8208 XBR | <<locked>> | 82% | 55,535 psi | 89% | 2503 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 53,490 psi | 86% | 2487 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,796 psi | 89% | 2487 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,041 psi | 87% | 2493 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 53,461 psi | 86% | 2513 fps | 99.7% |
| Lovex S070 | <<locked>> | 94% | 54,273 psi | 87% | 2546 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,784 psi | 64% | 2349 fps | 97.5% |
| Norma 201 | <<locked>> | 84% | 55,666 psi | 89% | 2503 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,275 psi | 90% | 2500 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,665 psi | 88% | 2546 fps | 100% |
| Norma 204 | <<locked>> | 94% | 52,750 psi | 85% | 2559 fps | 97.6% |
| Norma MRPᴾ | <<locked>> | 100% | 50,270 psi | 81% | 2625 fps | 98.8% |
| Norma URP | <<locked>> | 96% | 56,188 psi | 90% | 2612 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 55,114 psi | 88% | 2569 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,042 psi | 88% | 2618 fps | 99.7% |
| Ramshot TAC | <<locked>> | 82% | 55,521 psi | 89% | 2533 fps | 99.8% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,637 psi | 89% | 2546 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,724 psi | 59% | 1575 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,144 psi | 90% | 2552 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,188 psi | 90% | 2618 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,506 psi | 89% | 2648 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 53,432 psi | 86% | 2602 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 56,144 psi | 90% | 2680 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,202 psi | 90% | 2503 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,637 psi | 89% | 2546 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 53,447 psi | 86% | 2539 fps | 96.7% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,069 psi | 85% | 2589 fps | 98% |
| Rottweil R 907 | <<locked>> | 92% | 55,303 psi | 89% | 2536 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 92% | 53,461 psi | 86% | 2513 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,490 psi | 86% | 2487 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,041 psi | 87% | 2493 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,273 psi | 87% | 2546 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,679 psi | 86% | 2556 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,288 psi | 87% | 2516 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,274 psi | 89% | 2533 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,301 psi | 85% | 2398 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,853 psi | 86% | 2402 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,171 psi | 85% | 2467 fps | 99% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,576 psi | 84% | 2585 fps | 97.9% |
| Somchem S335 | <<locked>> | 84% | 56,289 psi | 90% | 2438 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,954 psi | 87% | 2503 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,709 psi | 89% | 2543 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 55,230 psi | 89% | 2536 fps | 96.1% |
| Somchem S365 | <<locked>> | 98% | 54,868 psi | 88% | 2612 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,751 psi | 86% | 2569 fps | 98.7% |
| Vihtavuori N133 | <<locked>> | 82% | 53,766 psi | 86% | 2382 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,434 psi | 90% | 2464 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,345 psi | 86% | 2441 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 53,606 psi | 86% | 2477 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,100 psi | 88% | 2562 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,441 psi | 74% | 2448 fps | 97.1% |
| Vihtavuori N530 | <<locked>> | 82% | 56,130 psi | 90% | 2507 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,911 psi | 88% | 2484 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,041 psi | 87% | 2566 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,169 psi | 80% | 2569 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,737 psi | 88% | 2536 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,405 psi | 90% | 2549 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 52,895 psi | 85% | 2579 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,422 psi | 65% | 2543 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,332 psi | 89% | 2543 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,517 psi | 81% | 2516 fps | 97.3% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 47,210 psi | 76% | 2356 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,585 psi | 73% | 2352 fps | 97% |
| Accurate 3100 | <<locked>> | 90% | 34,142 psi | 55% | 2238 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 44,686 psi | 72% | 2359 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,388 psi | 54% | 2231 fps | 97.3% |
| ADI AR 2206H | <<locked>> | 80% | 50,082 psi | 80% | 2464 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,714 psi | 68% | 2336 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 42,641 psi | 68% | 2411 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,185 psi | 84% | 2461 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,282 psi | 74% | 2520 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,772 psi | 69% | 2356 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,687 psi | 73% | 2415 fps | 99.9% |
| Alliant Reloder-16 | 54.7 gr | 80% | 33,315 psi | 53% | 2244 fps | 97.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,246 psi | 60% | 2352 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 42,148 psi | 68% | 2408 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 96% | 41,843 psi | 67% | 2448 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 82% | 25,759 psi | 41% | 2073 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 94% | 32,822 psi | 53% | 2270 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 86% | 31,183 psi | 50% | 2277 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,647 psi | 80% | 2477 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 41,118 psi | 66% | 2431 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 42,917 psi | 69% | 2369 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 41,843 psi | 67% | 2448 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 38,116 psi | 61% | 2251 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,706 psi | 83% | 2490 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,410 psi | 70% | 2375 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 80% | 35,505 psi | 57% | 2274 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 82% | 41,263 psi | 66% | 2343 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 50,633 psi | 81% | 2470 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,734 psi | 49% | 2152 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,963 psi | 75% | 2457 fps | 100% |
| Hodgdon Superformance | 63.8 gr | 82% | 37,028 psi | 59% | 2333 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,948 psi | 43% | 1371 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,617 psi | 78% | 2431 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,184 psi | 82% | 2454 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,875 psi | 72% | 2362 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,195 psi | 76% | 2388 fps | 98.1% |
| IMR 4350 | <<locked>> | 84% | 38,406 psi | 62% | 2280 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,581 psi | 63% | 2280 fps | 96.2% |
| IMR 4831 | <<locked>> | 80% | 32,430 psi | 52% | 2195 fps | 97.1% |
| IMR 4895 | <<locked>> | 80% | 46,862 psi | 75% | 2441 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 51,445 psi | 82% | 2503 fps | 95.7% |
| IMR 8208 XBR | <<locked>> | 80% | 52,185 psi | 84% | 2461 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,154 psi | 80% | 2444 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,545 psi | 79% | 2398 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 44,962 psi | 72% | 2362 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,028 psi | 59% | 2234 fps | 97% |
| Lovex S070 | <<locked>> | 80% | 35,215 psi | 56% | 2215 fps | 95.2% |
| Lovex S071 | <<locked>> | 94% | 32,837 psi | 53% | 2211 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 49,124 psi | 79% | 2415 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,588 psi | 80% | 2415 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,063 psi | 72% | 2405 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 43,279 psi | 69% | 2408 fps | 95.4% |
| Norma MRP | <<locked>> | 92% | 38,508 psi | 62% | 2411 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 33,518 psi | 54% | 2231 fps | 97.2% |
| Ramshot Big Game | <<locked>> | 80% | 45,034 psi | 72% | 2425 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 34,751 psi | 56% | 2267 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 52,069 psi | 83% | 2484 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,098 psi | 84% | 2500 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,456 psi | 44% | 1404 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,511 psi | 70% | 2359 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,081 psi | 79% | 2520 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,595 psi | 63% | 2405 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,040 psi | 53% | 2247 fps | 96.9% |
| ReloadSwiss RS 70 | 59.8 gr | 80% | 32,663 psi | 52% | 2247 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 46,775 psi | 75% | 2372 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,277 psi | 65% | 2316 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 47,050 psi | 75% | 2441 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 92% | 40,930 psi | 66% | 2388 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 38,116 psi | 61% | 2251 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,028 psi | 59% | 2234 fps | 97% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,154 psi | 80% | 2444 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,962 psi | 72% | 2362 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 35,215 psi | 56% | 2215 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,321 psi | 66% | 2365 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,792 psi | 81% | 2464 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,675 psi | 78% | 2441 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,227 psi | 81% | 2359 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,192 psi | 68% | 2244 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 36,289 psi | 58% | 2185 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 40,553 psi | 65% | 2385 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 49,821 psi | 80% | 2359 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,502 psi | 81% | 2454 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 40,857 psi | 66% | 2320 fps | 99.8% |
| Somchem S361 | <<locked>> | 96% | 51,735 psi | 83% | 2487 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 30,124 psi | 48% | 2192 fps | 99.1% |
| Somchem S385 | <<locked>> | 90% | 38,885 psi | 62% | 2326 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 50,691 psi | 81% | 2343 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,818 psi | 75% | 2343 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,021 psi | 75% | 2356 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,885 psi | 62% | 2257 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 34,882 psi | 56% | 2228 fps | 97.6% |
| Vihtavuori N165 | <<locked>> | 96% | 40,857 psi | 66% | 2352 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 52,678 psi | 84% | 2461 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,440 psi | 73% | 2356 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,476 psi | 55% | 2234 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 82% | 27,862 psi | 45% | 2139 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,258 psi | 55% | 2208 fps | 99.2% |
| Winchester 748 | <<locked>> | 80% | 52,982 psi | 85% | 2507 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 35,665 psi | 57% | 2277 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 84% | 24,192 psi | 39% | 2093 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,399 psi | 78% | 2444 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 43,961 psi | 70% | 2411 fps | 95.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 117 powders for .338 Win Mag. loaded with the .338 | 250gr | Woodleigh RN SN. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,680 fps; across all powders the maximum-charge window runs from 1,535 fps to 2,680 fps. Accurate 3100 gives the best case fill at 100 %, and 117 of the 117 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. ReloadSwiss RS 70, Alliant Reloder-16, Hodgdon Superformance rank at the top here: for .338 Win Mag. with the .338 | 250gr | Woodleigh RN SN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, Baschieri & Pellagri 109, Bofors RP30 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.