Load Specifications
Load data in caliber .338 Win Mag. with .338 | 250gr | Prvi Partizan FMJ-BT bullet and 103 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and ReloadSwiss RS 70.
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 2015 | <<locked>> | 82% | 53,896 psi | 86% | 2375 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,304 psi | 90% | 2444 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,085 psi | 87% | 2461 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,969 psi | 88% | 2461 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,960 psi | 69% | 2382 fps | 97.7% |
| Accurate 4064 | <<locked>> | 90% | 56,347 psi | 90% | 2493 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 56,057 psi | 90% | 2582 fps | 100% |
| ADI AR 2206H | <<locked>> | 86% | 56,289 psi | 90% | 2520 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 53,983 psi | 87% | 2480 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 50,633 psi | 81% | 2513 fps | 96.6% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,259 psi | 89% | 2474 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 53,011 psi | 85% | 2402 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,985 psi | 90% | 2635 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,201 psi | 87% | 2500 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,505 psi | 87% | 2520 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 53,476 psi | 86% | 2582 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,708 psi | 88% | 2615 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 49,661 psi | 80% | 2507 fps | 96.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,944 psi | 66% | 2408 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 36,056 psi | 58% | 2320 fps | 96.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,832 psi | 73% | 2562 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,246 psi | 90% | 2543 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 54,781 psi | 88% | 2516 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,636 psi | 88% | 2493 fps | 98.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 53,577 psi | 86% | 2411 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,752 psi | 88% | 2503 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,550 psi | 89% | 2530 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 96% | 55,027 psi | 88% | 2579 fps | 99% |
| Hodgdon H4350 | <<locked>> | 94% | 55,811 psi | 89% | 2546 fps | 98% |
| Hodgdon H4895 | <<locked>> | 84% | 53,490 psi | 86% | 2484 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,417 psi | 86% | 2516 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 52,881 psi | 85% | 2516 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,564 psi | 89% | 2618 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,723 psi | 57% | 1499 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,520 psi | 87% | 2484 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 53,737 psi | 86% | 2464 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 53,679 psi | 86% | 2464 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 53,345 psi | 86% | 2448 fps | 98.6% |
| IMR 4350 | <<locked>> | 98% | 54,955 psi | 88% | 2520 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 53,113 psi | 85% | 2474 fps | 98.5% |
| IMR 4831 | <<locked>> | 98% | 52,968 psi | 85% | 2526 fps | 99.9% |
| IMR 4895 | <<locked>> | 88% | 55,912 psi | 90% | 2543 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,259 psi | 89% | 2474 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,246 psi | 90% | 2497 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,738 psi | 89% | 2454 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 53,519 psi | 86% | 2461 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,014 psi | 90% | 2516 fps | 99.6% |
| Lovex S070 | <<locked>> | 96% | 53,403 psi | 86% | 2503 fps | 98.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 35,781 psi | 57% | 2251 fps | 95.8% |
| Norma 201 | <<locked>> | 86% | 55,100 psi | 88% | 2470 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,651 psi | 89% | 2467 fps | 100% |
| Norma 203B | <<locked>> | 88% | 53,751 psi | 86% | 2507 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,477 psi | 89% | 2566 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 45,658 psi | 73% | 2520 fps | 97.3% |
| Norma URP | <<locked>> | 98% | 54,853 psi | 88% | 2569 fps | 100% |
| Ramshot Big Game | <<locked>> | 88% | 54,114 psi | 87% | 2530 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 53,693 psi | 86% | 2569 fps | 99.3% |
| Ramshot TAC | <<locked>> | 84% | 55,448 psi | 89% | 2500 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,259 psi | 89% | 2513 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,970 psi | 90% | 2477 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,419 psi | 58% | 1539 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,782 psi | 89% | 2516 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,013 psi | 88% | 2575 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,389 psi | 87% | 2608 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,506 psi | 89% | 2602 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,810 psi | 88% | 2628 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 84% | 56,144 psi | 90% | 2448 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,695 psi | 89% | 2467 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,665 psi | 88% | 2507 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 52,547 psi | 84% | 2490 fps | 95.9% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 48,370 psi | 78% | 2490 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 94% | 54,636 psi | 88% | 2493 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,014 psi | 90% | 2516 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,246 psi | 90% | 2497 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 53,519 psi | 86% | 2461 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 53,403 psi | 86% | 2503 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,304 psi | 90% | 2566 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 53,983 psi | 87% | 2480 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,636 psi | 88% | 2497 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 53,301 psi | 85% | 2369 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 53,577 psi | 86% | 2372 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,057 psi | 90% | 2474 fps | 98.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 47,921 psi | 77% | 2484 fps | 96.4% |
| Somchem S335 | <<locked>> | 86% | 55,840 psi | 90% | 2408 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 53,650 psi | 86% | 2470 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,737 psi | 88% | 2503 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,808 psi | 85% | 2566 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,124 psi | 79% | 2474 fps | 97.5% |
| Vihtavuori N130 | <<locked>> | 82% | 56,144 psi | 90% | 2365 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 53,650 psi | 86% | 2356 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,506 psi | 89% | 2431 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,173 psi | 90% | 2448 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,057 psi | 90% | 2480 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 53,867 psi | 86% | 2516 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 84% | 55,724 psi | 89% | 2474 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,360 psi | 87% | 2451 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,420 psi | 90% | 2569 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,121 psi | 72% | 2474 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 53,708 psi | 86% | 2497 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,970 psi | 90% | 2520 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,303 psi | 89% | 2582 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,622 psi | 59% | 2428 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,752 psi | 88% | 2507 fps | 100% |
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% | 50,792 psi | 81% | 2339 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,482 psi | 70% | 2283 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,807 psi | 81% | 2418 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,467 psi | 68% | 2267 fps | 95.6% |
| Accurate 3100 | <<locked>> | 94% | 35,041 psi | 56% | 2238 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 41,162 psi | 66% | 2283 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 30,284 psi | 49% | 2142 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 46,731 psi | 75% | 2385 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 39,769 psi | 64% | 2257 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 96% | 44,744 psi | 72% | 2418 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,776 psi | 78% | 2385 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,545 psi | 79% | 2362 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,612 psi | 68% | 2428 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,624 psi | 64% | 2280 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,380 psi | 68% | 2333 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,835 psi | 49% | 2156 fps | 95.9% |
| Alliant Reloder-17 | 54.4 gr | 80% | 34,229 psi | 55% | 2267 fps | 98.8% |
| Alliant Reloder-19 | <<locked>> | 96% | 43,830 psi | 70% | 2408 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 86% | 26,716 psi | 43% | 2080 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 98% | 34,040 psi | 55% | 2270 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 90% | 32,416 psi | 52% | 2280 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,064 psi | 74% | 2395 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 39,349 psi | 63% | 2283 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 40,103 psi | 64% | 2260 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,575 psi | 81% | 2372 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,863 psi | 77% | 2411 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,176 psi | 64% | 2290 fps | 98.1% |
| Hodgdon H414 | <<locked>> | 84% | 37,275 psi | 60% | 2287 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 86% | 43,221 psi | 69% | 2352 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 47,166 psi | 76% | 2392 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,195 psi | 45% | 2067 fps | 96.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,453 psi | 70% | 2379 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 39,102 psi | 63% | 2346 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,760 psi | 43% | 1339 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,353 psi | 73% | 2352 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 47,253 psi | 76% | 2382 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,800 psi | 67% | 2283 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,092 psi | 71% | 2303 fps | 96.9% |
| IMR 4350 | <<locked>> | 88% | 40,277 psi | 65% | 2287 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 82% | 39,218 psi | 63% | 2244 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 29,544 psi | 47% | 2110 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 43,439 psi | 70% | 2359 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 48,776 psi | 78% | 2385 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,166 psi | 74% | 2365 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,514 psi | 75% | 2323 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 41,785 psi | 67% | 2287 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 34,389 psi | 55% | 2152 fps | 95.6% |
| Lovex S070 | <<locked>> | 84% | 36,883 psi | 59% | 2224 fps | 95.2% |
| Lovex S071 | <<locked>> | 98% | 33,620 psi | 54% | 2208 fps | 95% |
| Norma 201 | <<locked>> | 80% | 45,861 psi | 74% | 2339 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,267 psi | 74% | 2343 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,756 psi | 67% | 2323 fps | 99.6% |
| Norma 204 | <<locked>> | 92% | 45,498 psi | 73% | 2415 fps | 95.3% |
| Norma MRP | <<locked>> | 96% | 39,958 psi | 64% | 2411 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 30,792 psi | 49% | 2146 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 41,379 psi | 66% | 2339 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 36,303 psi | 58% | 2274 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 48,718 psi | 78% | 2402 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,385 psi | 78% | 2418 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,489 psi | 84% | 2431 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,079 psi | 43% | 1371 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,364 psi | 65% | 2274 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,904 psi | 72% | 2428 fps | 99.6% |
| ReloadSwiss RS 60 | 54.4 gr | 80% | 36,434 psi | 58% | 2320 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 30,037 psi | 48% | 2156 fps | 95.1% |
| ReloadSwiss RS 70 | 56.6 gr | 82% | 32,169 psi | 52% | 2208 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 49,850 psi | 80% | 2365 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,758 psi | 70% | 2300 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 37,144 psi | 60% | 2238 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 98% | 49,255 psi | 79% | 2444 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 96% | 42,424 psi | 68% | 2388 fps | 95% |
| Rottweil R 907 | <<locked>> | 84% | 40,103 psi | 64% | 2260 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,389 psi | 55% | 2152 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,166 psi | 74% | 2365 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,785 psi | 67% | 2287 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 36,883 psi | 59% | 2224 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,927 psi | 61% | 2280 fps | 99% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,108 psi | 76% | 2382 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,165 psi | 72% | 2359 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,065 psi | 75% | 2287 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,320 psi | 63% | 2175 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 38,276 psi | 61% | 2198 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 44,875 psi | 72% | 2434 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 46,702 psi | 75% | 2290 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,905 psi | 75% | 2375 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 37,811 psi | 61% | 2238 fps | 99.3% |
| Somchem S365 | <<locked>> | 80% | 27,644 psi | 44% | 2106 fps | 97.9% |
| Somchem S385 | <<locked>> | 94% | 40,480 psi | 65% | 2329 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 52,982 psi | 85% | 2329 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,471 psi | 76% | 2277 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,308 psi | 69% | 2274 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,845 psi | 70% | 2287 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,027 psi | 58% | 2185 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 32,010 psi | 51% | 2146 fps | 96.1% |
| Vihtavuori N530 | <<locked>> | 80% | 49,037 psi | 79% | 2385 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,221 psi | 68% | 2283 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 31,604 psi | 51% | 2149 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 86% | 28,631 psi | 46% | 2146 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,763 psi | 51% | 2126 fps | 98.1% |
| Winchester 748 | <<locked>> | 80% | 48,979 psi | 79% | 2428 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 37,275 psi | 60% | 2287 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 90% | 26,643 psi | 43% | 2149 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,904 psi | 72% | 2369 fps | 99.9% |
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 119 powders for .338 Win Mag. loaded with the .338 | 250gr | Prvi Partizan FMJ-BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,635 fps; across all powders the maximum-charge window runs from 1,499 fps to 2,635 fps. Accurate 3100 gives the best case fill at 100 %, and 119 of the 119 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:12.5 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. Alliant Reloder-17, ReloadSwiss RS 60, ReloadSwiss RS 70 rank at the top here: for .338 Win Mag. with the .338 | 250gr | Prvi Partizan FMJ-BT 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.