Load Specifications
Bullet Manufacturer:Nosler
Bullet Weight:250 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:.338 Win Mag. load data
Case Length (l3):2.5"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:86 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:15.0
Load data in caliber .338 Win Mag. with .338 | 250gr | Nosler Partition bullet and 106 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and Alliant Reloder-17.
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.
A valid access license is required to use the Personalized Load Calculator.
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 2015 | <<locked>> | 82% | 55,564 psi | 89% | 2405 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 54,607 psi | 88% | 2434 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,433 psi | 87% | 2484 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 54,273 psi | 87% | 2457 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,049 psi | 72% | 2425 fps | 98.3% |
| Accurate 4064 | <<locked>> | 88% | 54,694 psi | 88% | 2484 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 54,621 psi | 88% | 2572 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 54,520 psi | 87% | 2510 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 55,637 psi | 89% | 2513 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 52,562 psi | 84% | 2556 fps | 97.3% |
| ADI Benchmark 8208 | <<locked>> | 82% | 53,548 psi | 86% | 2464 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,853 psi | 88% | 2434 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 54,201 psi | 87% | 2621 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,999 psi | 90% | 2533 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 56,333 psi | 90% | 2552 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 55,535 psi | 89% | 2621 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 53,069 psi | 85% | 2602 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 51,605 psi | 83% | 2549 fps | 97.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 45,194 psi | 72% | 2490 fps | 96% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,583 psi | 68% | 2448 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,507 psi | 60% | 2365 fps | 97.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,848 psi | 77% | 2608 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,288 psi | 87% | 2526 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 53,185 psi | 85% | 2507 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 45,194 psi | 72% | 2490 fps | 96% |
| Bofors RP7 | <<locked>> | 94% | 56,420 psi | 90% | 2533 fps | 98.8% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,172 psi | 88% | 2444 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 52,997 psi | 85% | 2493 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 53,795 psi | 86% | 2516 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 55,216 psi | 89% | 2595 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 96% | 55,738 psi | 89% | 2559 fps | 98.2% |
| Hodgdon H4895 | <<locked>> | 84% | 55,143 psi | 88% | 2516 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 55,579 psi | 89% | 2552 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,955 psi | 88% | 2552 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 53,722 psi | 86% | 2608 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,940 psi | 58% | 1516 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,303 psi | 89% | 2507 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,085 psi | 87% | 2477 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,418 psi | 87% | 2487 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 53,708 psi | 86% | 2467 fps | 98.8% |
| IMR 4350 | <<locked>> | 96% | 53,243 psi | 85% | 2510 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 54,882 psi | 88% | 2513 fps | 98.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,199 psi | 84% | 2526 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 54,389 psi | 87% | 2536 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 53,548 psi | 86% | 2464 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,737 psi | 88% | 2487 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 53,940 psi | 86% | 2444 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 55,100 psi | 88% | 2490 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 54,462 psi | 87% | 2507 fps | 99.6% |
| Lovex S070 | <<locked>> | 96% | 55,376 psi | 89% | 2543 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 37,391 psi | 60% | 2293 fps | 96.5% |
| Norma 201 | <<locked>> | 84% | 53,403 psi | 86% | 2461 fps | 100% |
| Norma 202 | <<locked>> | 84% | 53,954 psi | 87% | 2457 fps | 100% |
| Norma 203B | <<locked>> | 88% | 55,564 psi | 89% | 2539 fps | 100% |
| Norma 204 | <<locked>> | 96% | 53,824 psi | 86% | 2559 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 47,645 psi | 76% | 2566 fps | 98% |
| Norma URP | <<locked>> | 96% | 53,563 psi | 86% | 2562 fps | 100% |
| Ramshot Big Game | <<locked>> | 88% | 56,289 psi | 90% | 2569 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 55,811 psi | 89% | 2612 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 43,845 psi | 70% | 2444 fps | 96% |
| Ramshot TAC | <<locked>> | 82% | 53,548 psi | 86% | 2487 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 53,461 psi | 86% | 2503 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,434 psi | 58% | 1552 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 53,969 psi | 87% | 2503 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 53,563 psi | 86% | 2569 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 52,881 psi | 85% | 2598 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 54,273 psi | 87% | 2595 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 53,388 psi | 86% | 2621 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 54,346 psi | 87% | 2434 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 53,998 psi | 87% | 2457 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 56,434 psi | 90% | 2539 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 54,302 psi | 87% | 2530 fps | 96.5% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 50,517 psi | 81% | 2533 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 94% | 56,420 psi | 90% | 2533 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 94% | 54,462 psi | 87% | 2507 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,737 psi | 88% | 2487 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,100 psi | 88% | 2490 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 55,376 psi | 89% | 2543 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 54,505 psi | 87% | 2552 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,666 psi | 89% | 2516 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 53,069 psi | 85% | 2487 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,781 psi | 88% | 2398 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,129 psi | 88% | 2402 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,433 psi | 87% | 2464 fps | 98.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 50,038 psi | 80% | 2530 fps | 97.2% |
| Somchem S335 | <<locked>> | 84% | 54,143 psi | 87% | 2398 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 55,274 psi | 89% | 2503 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 53,185 psi | 85% | 2493 fps | 100% |
| Somchem S361ᴾ | <<locked>> | 100% | 56,115 psi | 90% | 2526 fps | 95.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 55,332 psi | 89% | 2605 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 51,097 psi | 82% | 2513 fps | 98.1% |
| Unknown powder | <<locked>> | 94% | 54,375 psi | 87% | 2566 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 84% | 55,158 psi | 88% | 2382 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 53,867 psi | 86% | 2421 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 54,621 psi | 88% | 2441 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 54,505 psi | 87% | 2474 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,999 psi | 90% | 2556 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 44,121 psi | 71% | 2392 fps | 96.1% |
| Vihtavuori N530 | <<locked>> | 82% | 53,925 psi | 86% | 2461 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 56,028 psi | 90% | 2480 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 54,911 psi | 88% | 2562 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,427 psi | 76% | 2516 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 55,811 psi | 89% | 2533 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,216 psi | 89% | 2595 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,261 psi | 61% | 2480 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,229 psi | 85% | 2533 fps | 97.4% |
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 2015 | <<locked>> | 80% | 52,214 psi | 84% | 2365 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 45,136 psi | 72% | 2313 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,966 psi | 82% | 2441 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 41,945 psi | 67% | 2267 fps | 95.7% |
| Accurate 3100 | <<locked>> | 92% | 34,330 psi | 55% | 2231 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 42,699 psi | 68% | 2316 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 31,720 psi | 51% | 2182 fps | 96.5% |
| ADI AR 2206H | <<locked>> | 80% | 48,327 psi | 77% | 2421 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 41,060 psi | 66% | 2290 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 43,424 psi | 70% | 2408 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,430 psi | 81% | 2421 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,358 psi | 82% | 2392 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,324 psi | 71% | 2470 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,031 psi | 66% | 2313 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,976 psi | 71% | 2372 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,908 psi | 51% | 2195 fps | 96.6% |
| Alliant Reloder-17 | 56.3 gr | 80% | 35,476 psi | 57% | 2303 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 94% | 42,627 psi | 68% | 2398 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 98% | 42,264 psi | 68% | 2438 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 84% | 26,078 psi | 42% | 2070 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 96% | 33,141 psi | 53% | 2260 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 88% | 31,488 psi | 50% | 2270 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,500 psi | 76% | 2431 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 40,756 psi | 65% | 2320 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 42,264 psi | 68% | 2438 fps | 95.1% |
| Bofors RP7 | <<locked>> | 82% | 39,015 psi | 63% | 2251 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,764 psi | 83% | 2402 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,647 psi | 80% | 2448 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,437 psi | 66% | 2323 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 80% | 36,622 psi | 59% | 2283 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 88% | 43,540 psi | 70% | 2369 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 48,863 psi | 78% | 2431 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,312 psi | 47% | 2103 fps | 97.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,279 psi | 68% | 2369 fps | 100% |
| Hodgdon Superformance | 63.9 gr | 86% | 40,451 psi | 65% | 2385 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,861 psi | 43% | 1352 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,308 psi | 69% | 2329 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 45,005 psi | 72% | 2356 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,364 psi | 65% | 2270 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 39,972 psi | 64% | 2241 fps | 96.1% |
| IMR 4350 | <<locked>> | 86% | 39,233 psi | 63% | 2280 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 37,985 psi | 61% | 2231 fps | 95.3% |
| IMR 4831 | <<locked>> | 82% | 29,863 psi | 48% | 2123 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 45,092 psi | 72% | 2398 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 80% | 50,430 psi | 81% | 2421 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,848 psi | 77% | 2398 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,877 psi | 77% | 2356 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 43,221 psi | 69% | 2320 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 35,549 psi | 57% | 2188 fps | 96.2% |
| Lovex S070 | <<locked>> | 82% | 35,926 psi | 58% | 2215 fps | 95.1% |
| Lovex S071 | <<locked>> | 96% | 32,953 psi | 53% | 2201 fps | 95% |
| Norma 201 | <<locked>> | 80% | 47,297 psi | 76% | 2372 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,718 psi | 77% | 2375 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,352 psi | 70% | 2359 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 43,976 psi | 71% | 2402 fps | 95.2% |
| Norma MRP | <<locked>> | 94% | 38,986 psi | 63% | 2405 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 31,981 psi | 51% | 2182 fps | 96.4% |
| Ramshot Big Game | <<locked>> | 80% | 43,047 psi | 69% | 2379 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 35,404 psi | 57% | 2267 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 98% | 40,857 psi | 66% | 2388 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 50,270 psi | 81% | 2438 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,893 psi | 80% | 2451 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,180 psi | 44% | 1385 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,698 psi | 67% | 2310 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,673 psi | 75% | 2467 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,753 psi | 61% | 2356 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,270 psi | 50% | 2192 fps | 95.9% |
| ReloadSwiss RS 70 | 58.6 gr | 82% | 33,359 psi | 53% | 2251 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 51,430 psi | 82% | 2398 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,962 psi | 72% | 2329 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 38,537 psi | 62% | 2274 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 96% | 47,979 psi | 77% | 2438 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 94% | 41,495 psi | 67% | 2385 fps | 95% |
| Rottweil R 907 | <<locked>> | 82% | 39,015 psi | 63% | 2251 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,549 psi | 57% | 2188 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,848 psi | 77% | 2398 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,221 psi | 69% | 2320 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 35,926 psi | 58% | 2215 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,363 psi | 63% | 2316 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,820 psi | 78% | 2421 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,688 psi | 75% | 2395 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,327 psi | 77% | 2316 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,480 psi | 65% | 2205 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 36,970 psi | 59% | 2185 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 43,801 psi | 70% | 2428 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 48,066 psi | 77% | 2320 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,327 psi | 77% | 2408 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 39,160 psi | 63% | 2274 fps | 99.6% |
| Somchem S361 | <<locked>> | 98% | 52,591 psi | 84% | 2477 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 28,703 psi | 46% | 2146 fps | 98.5% |
| Somchem S385 | <<locked>> | 92% | 39,508 psi | 63% | 2323 fps | 95.3% |
| Unknown powder | <<locked>> | 80% | 34,693 psi | 56% | 2231 fps | 96.6% |
| Vihtavuori N133 | <<locked>> | 80% | 48,776 psi | 78% | 2303 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,773 psi | 72% | 2303 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,252 psi | 73% | 2316 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,289 psi | 60% | 2215 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 33,359 psi | 53% | 2185 fps | 96.8% |
| Vihtavuori N165 | <<locked>> | 98% | 41,278 psi | 66% | 2343 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 50,444 psi | 81% | 2415 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,468 psi | 70% | 2310 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 32,750 psi | 53% | 2185 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 84% | 28,021 psi | 45% | 2136 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,764 psi | 53% | 2159 fps | 98.6% |
| Winchester 760 | <<locked>> | 80% | 36,622 psi | 59% | 2283 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 25,991 psi | 42% | 2139 fps | 96% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,192 psi | 69% | 2379 fps | 95% |
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 118 powders for .338 Win Mag. loaded with the .338 | 250gr | Nosler Partition. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,621 fps; across all powders the maximum-charge window runs from 1,516 fps to 2,621 fps. Accurate 3100 gives the best case fill at 100 %, and 118 of the 118 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:15.0 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .338 Win Mag. with the .338 | 250gr | Nosler Partition they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 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.