Load Specifications
Load data in caliber .338 Win Mag. with .338 | 250gr | Barnes X S bullet and 102 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-17 and ReloadSwiss RS 60.
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% | 54,520 psi | 87% | 2398 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,476 psi | 87% | 2434 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,239 psi | 76% | 2425 fps | 98.5% |
| Accurate 4064 | <<locked>> | 86% | 54,302 psi | 87% | 2441 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,026 psi | 85% | 2520 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 55,970 psi | 90% | 2497 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,432 psi | 86% | 2454 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,621 psi | 86% | 2539 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,766 psi | 88% | 2448 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,289 psi | 90% | 2418 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,230 psi | 89% | 2608 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,143 psi | 87% | 2480 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,447 psi | 87% | 2497 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,388 psi | 86% | 2562 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,288 psi | 87% | 2589 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,750 psi | 85% | 2533 fps | 97.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 46,717 psi | 75% | 2484 fps | 96% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,295 psi | 71% | 2444 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,189 psi | 63% | 2365 fps | 97.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,371 psi | 79% | 2598 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,608 psi | 89% | 2513 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 54,955 psi | 88% | 2497 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 46,717 psi | 75% | 2484 fps | 96% |
| Bofors RP7 | <<locked>> | 92% | 54,505 psi | 87% | 2470 fps | 98.3% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,202 psi | 90% | 2428 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,592 psi | 88% | 2480 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,332 psi | 89% | 2507 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 94% | 54,882 psi | 88% | 2559 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 92% | 55,071 psi | 88% | 2516 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 82% | 53,316 psi | 85% | 2461 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 53,258 psi | 85% | 2493 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 56,014 psi | 90% | 2536 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 54,853 psi | 88% | 2592 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,448 psi | 58% | 1503 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,186 psi | 87% | 2461 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,780 psi | 86% | 2444 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 56,318 psi | 90% | 2480 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,028 psi | 90% | 2467 fps | 98.9% |
| IMR 4350 | <<locked>> | 96% | 54,317 psi | 87% | 2493 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,883 psi | 90% | 2493 fps | 98.8% |
| IMR 4831 | <<locked>> | 96% | 53,258 psi | 85% | 2510 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 55,854 psi | 90% | 2520 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,766 psi | 88% | 2448 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 53,214 psi | 85% | 2438 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,216 psi | 89% | 2428 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,679 psi | 86% | 2441 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,086 psi | 90% | 2497 fps | 99.6% |
| Lovex S070 | <<locked>> | 94% | 53,664 psi | 86% | 2484 fps | 98.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,842 psi | 64% | 2303 fps | 96.9% |
| Norma 201 | <<locked>> | 84% | 55,477 psi | 89% | 2451 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,434 psi | 89% | 2444 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,766 psi | 86% | 2484 fps | 100% |
| Norma 204 | <<locked>> | 96% | 54,853 psi | 88% | 2539 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 49,066 psi | 79% | 2556 fps | 98% |
| Norma URP | <<locked>> | 96% | 54,839 psi | 88% | 2549 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 53,722 psi | 86% | 2507 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 53,403 psi | 86% | 2546 fps | 99.3% |
| Ramshot TAC | <<locked>> | 82% | 54,839 psi | 88% | 2474 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,752 psi | 88% | 2487 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,072 psi | 59% | 1539 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,361 psi | 89% | 2490 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,926 psi | 88% | 2556 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 53,911 psi | 86% | 2582 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 55,463 psi | 89% | 2582 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,418 psi | 87% | 2605 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 86% | 55,898 psi | 90% | 2448 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,056 psi | 88% | 2490 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 55,303 psi | 89% | 2513 fps | 96.3% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,764 psi | 83% | 2520 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 92% | 54,505 psi | 87% | 2470 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,086 psi | 90% | 2497 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,214 psi | 85% | 2438 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,679 psi | 86% | 2441 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,664 psi | 86% | 2484 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,782 psi | 89% | 2539 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,853 psi | 86% | 2457 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,302 psi | 87% | 2474 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,144 psi | 90% | 2385 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,159 psi | 90% | 2385 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,912 psi | 90% | 2451 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,271 psi | 82% | 2516 fps | 97.1% |
| Somchem S335 | <<locked>> | 84% | 55,941 psi | 90% | 2388 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,214 psi | 85% | 2444 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,955 psi | 88% | 2484 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 53,040 psi | 85% | 2549 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,765 psi | 85% | 2503 fps | 98.1% |
| Vihtavuori N133 | <<locked>> | 84% | 56,333 psi | 90% | 2369 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,709 psi | 89% | 2411 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,883 psi | 90% | 2425 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,159 psi | 90% | 2464 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,766 psi | 86% | 2497 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 45,614 psi | 73% | 2385 fps | 96.1% |
| Vihtavuori N530 | <<locked>> | 82% | 55,288 psi | 89% | 2448 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,027 psi | 87% | 2428 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 56,231 psi | 90% | 2549 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,139 psi | 79% | 2513 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,229 psi | 85% | 2474 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,376 psi | 89% | 2493 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,882 psi | 88% | 2559 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,987 psi | 64% | 2480 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,331 psi | 87% | 2484 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 49,110 psi | 79% | 2441 fps | 96.2% |
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% | 48,269 psi | 77% | 2316 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,440 psi | 73% | 2297 fps | 96.3% |
| Accurate 3100 | <<locked>> | 90% | 34,606 psi | 55% | 2201 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 45,600 psi | 73% | 2323 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,084 psi | 55% | 2198 fps | 97% |
| ADI AR 2206H | <<locked>> | 80% | 49,719 psi | 80% | 2408 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,424 psi | 68% | 2283 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 44,860 psi | 72% | 2398 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,605 psi | 83% | 2405 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,055 psi | 85% | 2382 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,542 psi | 73% | 2457 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,801 psi | 69% | 2310 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,571 psi | 73% | 2362 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,562 psi | 54% | 2198 fps | 97% |
| Alliant Reloder-17 | 54.2 gr | 80% | 37,217 psi | 60% | 2306 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 94% | 44,208 psi | 71% | 2392 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 98% | 44,005 psi | 71% | 2438 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,716 psi | 43% | 2051 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 96% | 34,969 psi | 56% | 2267 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 86% | 31,633 psi | 51% | 2234 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,979 psi | 79% | 2421 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 43,076 psi | 69% | 2323 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 44,005 psi | 71% | 2438 fps | 95.3% |
| Bofors RP7 | <<locked>> | 82% | 40,886 psi | 66% | 2251 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,229 psi | 85% | 2388 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,140 psi | 82% | 2434 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,497 psi | 70% | 2323 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 82% | 37,855 psi | 61% | 2274 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 84% | 43,439 psi | 70% | 2333 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 50,256 psi | 81% | 2418 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,285 psi | 50% | 2116 fps | 97.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,470 psi | 75% | 2405 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 39,363 psi | 63% | 2329 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,282 psi | 44% | 1339 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,037 psi | 77% | 2375 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 50,459 psi | 81% | 2402 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,599 psi | 72% | 2310 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,949 psi | 75% | 2329 fps | 97.5% |
| IMR 4350 | <<locked>> | 86% | 40,654 psi | 65% | 2274 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,436 psi | 63% | 2224 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 32,880 psi | 53% | 2156 fps | 96.7% |
| IMR 4895 | <<locked>> | 80% | 46,630 psi | 75% | 2388 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 80% | 51,605 psi | 83% | 2405 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,864 psi | 80% | 2392 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,095 psi | 79% | 2343 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,034 psi | 72% | 2316 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,579 psi | 60% | 2192 fps | 96.5% |
| Lovex S070 | <<locked>> | 82% | 38,043 psi | 61% | 2221 fps | 95.5% |
| Lovex S071 | <<locked>> | 96% | 35,389 psi | 57% | 2218 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 49,269 psi | 79% | 2365 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,385 psi | 79% | 2365 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,962 psi | 72% | 2352 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 45,440 psi | 73% | 2395 fps | 95.2% |
| Norma MRP | <<locked>> | 92% | 38,334 psi | 61% | 2356 fps | 95% |
| Norma URP | <<locked>> | 80% | 33,866 psi | 54% | 2192 fps | 96.8% |
| Ramshot Big Game | <<locked>> | 80% | 44,454 psi | 71% | 2369 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 82% | 35,027 psi | 56% | 2221 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 51,517 psi | 83% | 2425 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,401 psi | 82% | 2441 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,702 psi | 44% | 1371 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,395 psi | 70% | 2303 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,167 psi | 77% | 2457 fps | 99.8% |
| ReloadSwiss RS 60 | 54.2 gr | 80% | 39,392 psi | 63% | 2356 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,388 psi | 54% | 2205 fps | 96.4% |
| ReloadSwiss RS 70 | 55 gr | 80% | 32,982 psi | 53% | 2201 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 47,123 psi | 76% | 2326 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,785 psi | 65% | 2277 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 96% | 49,182 psi | 79% | 2425 fps | 95% |
| Rottweil R 905 | <<locked>> | 94% | 42,960 psi | 69% | 2379 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 82% | 40,886 psi | 66% | 2251 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,579 psi | 60% | 2192 fps | 96.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,864 psi | 80% | 2392 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,034 psi | 72% | 2316 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 38,043 psi | 61% | 2221 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,944 psi | 66% | 2313 fps | 99.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,488 psi | 81% | 2411 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,066 psi | 77% | 2385 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,893 psi | 80% | 2306 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,061 psi | 67% | 2195 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,073 psi | 63% | 2188 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 45,237 psi | 73% | 2418 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 49,792 psi | 80% | 2310 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,951 psi | 80% | 2402 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,118 psi | 66% | 2274 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 30,777 psi | 49% | 2159 fps | 98.9% |
| Somchem S385 | <<locked>> | 92% | 41,263 psi | 66% | 2320 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 50,169 psi | 80% | 2293 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,673 psi | 75% | 2297 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,876 psi | 75% | 2310 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,160 psi | 63% | 2215 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 35,012 psi | 56% | 2185 fps | 97.1% |
| Vihtavuori N165 | <<locked>> | 98% | 42,989 psi | 69% | 2339 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 51,953 psi | 83% | 2405 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,281 psi | 73% | 2306 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,780 psi | 56% | 2192 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 82% | 28,703 psi | 46% | 2116 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,519 psi | 55% | 2165 fps | 98.8% |
| Winchester 748 | <<locked>> | 80% | 52,098 psi | 84% | 2451 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 37,985 psi | 61% | 2277 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,614 psi | 43% | 2116 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,979 psi | 77% | 2395 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 46,151 psi | 74% | 2395 fps | 95.5% |
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 116 powders for .338 Win Mag. loaded with the .338 | 250gr | Barnes X S. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,608 fps; across all powders the maximum-charge window runs from 1,503 fps to 2,608 fps. Accurate 3100 gives the best case fill at 100 %, and 116 of the 116 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 1:13.0 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-17, ReloadSwiss RS 60 rank at the top here: for .338 Win Mag. with the .338 | 250gr | Barnes X S 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.