Load Specifications
Load data in caliber .338 Win Mag. with .338 | 225gr | NorthFork Bonded Core bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, 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.
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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>> | 84% | 55,767 psi | 89% | 2556 fps | 100% |
| Accurate 2495 | <<locked>> | 84% | 53,461 psi | 86% | 2589 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,404 psi | 87% | 2631 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 54,534 psi | 87% | 2589 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,191 psi | 66% | 2487 fps | 96.4% |
| Accurate 4064 | <<locked>> | 90% | 54,259 psi | 87% | 2625 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,070 psi | 87% | 2710 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 54,636 psi | 88% | 2651 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,680 psi | 89% | 2654 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,795 psi | 86% | 2608 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,665 psi | 88% | 2582 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,157 psi | 87% | 2766 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,666 psi | 89% | 2674 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,362 psi | 90% | 2697 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,056 psi | 88% | 2759 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 52,910 psi | 85% | 2743 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,450 psi | 63% | 2516 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,121 psi | 71% | 2671 fps | 98.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,404 psi | 87% | 2671 fps | 99.8% |
| Bofors RP3 | <<locked>> | 92% | 56,275 psi | 90% | 2690 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 52,910 psi | 85% | 2615 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,448 psi | 89% | 2589 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 52,910 psi | 85% | 2635 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,998 psi | 88% | 2730 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 53,853 psi | 86% | 2589 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 53,679 psi | 86% | 2654 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 54,723 psi | 88% | 2726 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 98% | 55,477 psi | 89% | 2690 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 86% | 55,172 psi | 88% | 2661 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,459 psi | 83% | 2641 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,665 psi | 88% | 2697 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,635 psi | 86% | 2736 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,694 psi | 57% | 1604 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,419 psi | 89% | 2651 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 53,882 psi | 86% | 2625 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,534 psi | 87% | 2628 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 92% | 53,969 psi | 87% | 2605 fps | 98% |
| IMR 4350 | <<locked>> | 98% | 53,156 psi | 85% | 2641 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,737 psi | 88% | 2644 fps | 98.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,399 psi | 78% | 2612 fps | 99.3% |
| IMR 4895 | <<locked>> | 88% | 54,230 psi | 87% | 2674 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 53,795 psi | 86% | 2608 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,404 psi | 87% | 2631 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,186 psi | 87% | 2585 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 55,042 psi | 88% | 2635 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,331 psi | 87% | 2641 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 55,013 psi | 88% | 2674 fps | 98.4% |
| Norma 201 | <<locked>> | 86% | 53,635 psi | 86% | 2605 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,099 psi | 87% | 2605 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,564 psi | 89% | 2684 fps | 100% |
| Norma 204 | <<locked>> | 98% | 53,519 psi | 86% | 2684 fps | 96.2% |
| Norma URP | <<locked>> | 98% | 52,982 psi | 85% | 2694 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 90% | 56,115 psi | 90% | 2710 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,419 psi | 89% | 2746 fps | 99% |
| Ramshot TAC | <<locked>> | 84% | 53,969 psi | 87% | 2628 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 84% | 53,519 psi | 86% | 2641 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,549 psi | 87% | 2612 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,100 psi | 58% | 1640 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,143 psi | 87% | 2641 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 53,301 psi | 85% | 2710 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,347 psi | 90% | 2792 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 53,606 psi | 86% | 2730 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,098 psi | 85% | 2753 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 84% | 54,607 psi | 88% | 2582 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,172 psi | 87% | 2602 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,144 psi | 90% | 2684 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 52,910 psi | 85% | 2615 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,331 psi | 87% | 2641 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,404 psi | 87% | 2631 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,042 psi | 88% | 2635 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,013 psi | 88% | 2674 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,331 psi | 87% | 2694 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,912 psi | 90% | 2657 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 53,214 psi | 85% | 2628 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,897 psi | 88% | 2543 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,085 psi | 88% | 2543 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,360 psi | 87% | 2595 fps | 98% |
| Somchem S321 | <<locked>> | 82% | 54,897 psi | 88% | 2638 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,476 psi | 87% | 2543 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,492 psi | 89% | 2648 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 56,405 psi | 90% | 2680 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,024 psi | 82% | 2700 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 47,442 psi | 76% | 2585 fps | 96.2% |
| Unknown powder | <<locked>> | 96% | 54,157 psi | 87% | 2703 fps | 99.4% |
| Vihtavuori N130 | <<locked>> | 82% | 53,635 psi | 86% | 2493 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,694 psi | 88% | 2523 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 53,679 psi | 86% | 2566 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 53,650 psi | 86% | 2575 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 54,404 psi | 87% | 2615 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,592 psi | 88% | 2674 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 53,359 psi | 86% | 2612 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 53,461 psi | 86% | 2602 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 54,853 psi | 88% | 2720 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,308 psi | 69% | 2589 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,898 psi | 90% | 2674 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,679 psi | 88% | 2661 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,723 psi | 88% | 2726 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,404 psi | 57% | 2523 fps | 99.1% |
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% | 49,356 psi | 79% | 2470 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,876 psi | 75% | 2497 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,442 psi | 76% | 2533 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 44,875 psi | 72% | 2438 fps | 95.2% |
| Accurate 3100 | <<locked>> | 98% | 38,580 psi | 62% | 2438 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 39,653 psi | 64% | 2402 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,417 psi | 54% | 2343 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 45,281 psi | 73% | 2507 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 38,566 psi | 62% | 2369 fps | 97.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,369 psi | 76% | 2513 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 48,066 psi | 77% | 2497 fps | 100% |
| Alliant Power Pro 2000-MR | 58.3 gr | 80% | 41,249 psi | 66% | 2543 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,232 psi | 61% | 2392 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,002 psi | 66% | 2451 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,633 psi | 51% | 2300 fps | 95% |
| Alliant Reloder-17 | 57.4 gr | 80% | 32,996 psi | 53% | 2365 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,080 psi | 47% | 2264 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,679 psi | 57% | 2487 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,541 psi | 71% | 2513 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 37,898 psi | 61% | 2395 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 44,063 psi | 71% | 2467 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,139 psi | 79% | 2500 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,296 psi | 74% | 2536 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,285 psi | 82% | 2674 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 80% | 50,372 psi | 81% | 2543 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,696 psi | 62% | 2398 fps | 96.9% |
| Hodgdon H414 | <<locked>> | 86% | 41,684 psi | 67% | 2507 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 92% | 46,180 psi | 74% | 2543 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 45,745 psi | 73% | 2516 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,354 psi | 44% | 2162 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,858 psi | 67% | 2497 fps | 99.6% |
| Hodgdon Superformance | 68.3 gr | 90% | 43,482 psi | 70% | 2562 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,455 psi | 42% | 1427 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,814 psi | 65% | 2415 fps | 99.2% |
| IMR 3031 | <<locked>> | 80% | 41,916 psi | 67% | 2451 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,884 psi | 61% | 2346 fps | 98% |
| IMR 4166 Enduron | <<locked>> | 84% | 42,453 psi | 68% | 2411 fps | 95.5% |
| IMR 4350 | <<locked>> | 92% | 44,135 psi | 71% | 2493 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 42,975 psi | 69% | 2448 fps | 95.6% |
| IMR 4831 | <<locked>> | 86% | 31,154 psi | 50% | 2274 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 42,032 psi | 67% | 2477 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 47,369 psi | 76% | 2513 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,628 psi | 72% | 2490 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,426 psi | 73% | 2448 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 40,596 psi | 65% | 2405 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 37,608 psi | 60% | 2352 fps | 95.6% |
| Lovex S070 | <<locked>> | 88% | 40,509 psi | 65% | 2428 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 44,396 psi | 71% | 2461 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 44,701 psi | 72% | 2467 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,393 psi | 65% | 2438 fps | 98.9% |
| Norma 204 | <<locked>> | 96% | 50,096 psi | 80% | 2631 fps | 95.4% |
| Norma URP | <<locked>> | 84% | 33,794 psi | 54% | 2346 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 39,972 psi | 64% | 2454 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 37,536 psi | 60% | 2431 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 47,253 psi | 76% | 2523 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,905 psi | 75% | 2543 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,068 psi | 82% | 2559 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,890 psi | 43% | 1463 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,059 psi | 63% | 2382 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,265 psi | 69% | 2546 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,143 psi | 56% | 2428 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 33,083 psi | 53% | 2356 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 35,534 psi | 57% | 2415 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 48,501 psi | 78% | 2497 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,438 psi | 68% | 2421 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 35,665 psi | 57% | 2343 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 44,063 psi | 71% | 2467 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,608 psi | 60% | 2352 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,628 psi | 72% | 2490 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,596 psi | 65% | 2405 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 40,509 psi | 65% | 2428 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,564 psi | 59% | 2388 fps | 98% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,600 psi | 73% | 2500 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,801 psi | 70% | 2480 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,876 psi | 74% | 2415 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,232 psi | 61% | 2293 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,974 psi | 67% | 2398 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 51,300 psi | 82% | 2589 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,295 psi | 73% | 2415 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,382 psi | 73% | 2497 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 36,492 psi | 59% | 2349 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 26,527 psi | 43% | 2195 fps | 96.3% |
| Somchem S385 | <<locked>> | 98% | 44,382 psi | 71% | 2536 fps | 95.5% |
| Unknown powder | <<locked>> | 82% | 34,374 psi | 55% | 2343 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 50,705 psi | 81% | 2454 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,236 psi | 69% | 2365 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,989 psi | 67% | 2398 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,930 psi | 67% | 2402 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,183 psi | 50% | 2211 fps | 98.2% |
| Vihtavuori N160 | <<locked>> | 80% | 32,227 psi | 52% | 2274 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 49,922 psi | 80% | 2562 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,408 psi | 66% | 2418 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 32,561 psi | 52% | 2310 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 90% | 31,314 psi | 50% | 2336 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,748 psi | 49% | 2224 fps | 96.8% |
| Winchester 748 | <<locked>> | 80% | 51,024 psi | 82% | 2608 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 41,684 psi | 67% | 2507 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,153 psi | 47% | 2343 fps | 96.2% |
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 98 powders for .338 Win Mag. loaded with the .338 | 225gr | NorthFork Bonded Core. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,792 fps; across all powders the maximum-charge window runs from 1,604 fps to 2,792 fps. Accurate 3100 gives the best case fill at 100 %, and 98 of the 98 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 225.0 gr projectile in 0.338" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-16, Alliant Reloder-23 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 Power Pro 2000-MR, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .338 Win Mag. with the .338 | 225gr | NorthFork Bonded Core they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.