Load Specifications
Load data in caliber .338 Win Mag. with .338 | 225gr | Woodleigh HS 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 Reloder-17, ReloadSwiss RS 60 and Hodgdon H414.
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% | 56,144 psi | 90% | 2562 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,027 psi | 88% | 2589 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 52,881 psi | 85% | 2605 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 53,838 psi | 86% | 2592 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,814 psi | 67% | 2500 fps | 96.6% |
| Accurate 4064 | <<locked>> | 90% | 54,853 psi | 88% | 2635 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,650 psi | 88% | 2720 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 55,230 psi | 89% | 2664 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 56,202 psi | 90% | 2664 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,128 psi | 87% | 2615 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,129 psi | 88% | 2589 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,679 psi | 88% | 2779 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,231 psi | 90% | 2687 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 53,432 psi | 86% | 2661 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,782 psi | 89% | 2772 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 53,388 psi | 86% | 2756 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,987 psi | 64% | 2530 fps | 99.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,686 psi | 72% | 2684 fps | 98.7% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,911 psi | 88% | 2680 fps | 99.8% |
| Bofors RP3 | <<locked>> | 90% | 53,243 psi | 85% | 2654 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 53,403 psi | 86% | 2625 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,796 psi | 89% | 2598 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 53,490 psi | 86% | 2648 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,376 psi | 89% | 2736 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 54,215 psi | 87% | 2667 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 96% | 53,708 psi | 86% | 2717 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 94% | 54,462 psi | 87% | 2680 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 86% | 55,767 psi | 89% | 2674 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,938 psi | 83% | 2651 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,245 psi | 89% | 2707 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,215 psi | 87% | 2749 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,708 psi | 57% | 1608 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 53,476 psi | 86% | 2628 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,869 psi | 90% | 2654 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,579 psi | 89% | 2648 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,666 psi | 89% | 2631 fps | 98.3% |
| IMR 4350 | <<locked>> | 98% | 53,635 psi | 86% | 2651 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,434 psi | 89% | 2657 fps | 98.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,013 psi | 88% | 2710 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 54,795 psi | 88% | 2687 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,128 psi | 87% | 2615 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,013 psi | 88% | 2641 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,723 psi | 88% | 2595 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 55,622 psi | 89% | 2644 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,795 psi | 88% | 2651 fps | 99.2% |
| Lovex S070 | <<locked>> | 98% | 55,709 psi | 89% | 2687 fps | 98.6% |
| Norma 201 | <<locked>> | 86% | 53,983 psi | 87% | 2612 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,433 psi | 87% | 2612 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,101 psi | 90% | 2697 fps | 100% |
| Norma 204 | <<locked>> | 98% | 54,230 psi | 87% | 2700 fps | 96.5% |
| Norma MRPᴾ | <<locked>> | 100% | 44,628 psi | 72% | 2641 fps | 96.1% |
| Norma URP | <<locked>> | 98% | 53,722 psi | 86% | 2707 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 88% | 52,852 psi | 85% | 2671 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,811 psi | 89% | 2756 fps | 99.1% |
| Ramshot TAC | <<locked>> | 84% | 54,433 psi | 87% | 2638 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 84% | 53,998 psi | 87% | 2654 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,027 psi | 88% | 2621 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,100 psi | 58% | 1644 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,621 psi | 88% | 2651 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 53,679 psi | 86% | 2720 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 53,272 psi | 85% | 2753 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,128 psi | 87% | 2740 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,708 psi | 86% | 2766 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 84% | 54,969 psi | 88% | 2592 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,520 psi | 87% | 2612 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 53,345 psi | 86% | 2648 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 53,403 psi | 86% | 2625 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,795 psi | 88% | 2651 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,013 psi | 88% | 2641 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,622 psi | 89% | 2644 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,709 psi | 89% | 2687 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,824 psi | 88% | 2703 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,434 psi | 90% | 2667 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 53,476 psi | 86% | 2638 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,535 psi | 89% | 2552 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,666 psi | 89% | 2552 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,042 psi | 88% | 2608 fps | 98.2% |
| Somchem S321 | <<locked>> | 82% | 55,230 psi | 89% | 2644 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,781 psi | 88% | 2552 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,999 psi | 90% | 2657 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 53,708 psi | 86% | 2644 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,517 psi | 83% | 2707 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 47,863 psi | 77% | 2598 fps | 96.4% |
| Vihtavuori N130 | <<locked>> | 82% | 55,303 psi | 89% | 2516 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,796 psi | 89% | 2536 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,375 psi | 87% | 2579 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,969 psi | 88% | 2592 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,911 psi | 88% | 2621 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,144 psi | 90% | 2703 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 54,752 psi | 88% | 2618 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 53,156 psi | 85% | 2592 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,216 psi | 89% | 2710 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,801 psi | 70% | 2598 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,275 psi | 90% | 2680 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,534 psi | 87% | 2661 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 53,954 psi | 87% | 2720 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,694 psi | 57% | 2536 fps | 99.3% |
| Winchester StaBALL Match | <<locked>> | 86% | 53,345 psi | 86% | 2644 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% | 49,777 psi | 80% | 2480 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,496 psi | 68% | 2415 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,588 psi | 80% | 2559 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 44,353 psi | 71% | 2441 fps | 95.2% |
| Accurate 3100 | <<locked>> | 96% | 36,448 psi | 58% | 2398 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 40,205 psi | 64% | 2415 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 31,430 psi | 50% | 2300 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 45,847 psi | 74% | 2520 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 38,885 psi | 62% | 2379 fps | 98% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,935 psi | 77% | 2523 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 48,530 psi | 78% | 2507 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,756 psi | 67% | 2556 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,754 psi | 62% | 2405 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,553 psi | 67% | 2464 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 82% | 32,053 psi | 51% | 2313 fps | 95.3% |
| Alliant Reloder-17 | 58 gr | 80% | 33,417 psi | 54% | 2379 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,414 psi | 47% | 2277 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 92% | 33,736 psi | 54% | 2441 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,049 psi | 72% | 2526 fps | 98.9% |
| Bofors RP3 | <<locked>> | 80% | 38,450 psi | 62% | 2408 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 44,512 psi | 71% | 2480 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,472 psi | 79% | 2507 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,876 psi | 75% | 2549 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,648 psi | 83% | 2684 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 80% | 39,204 psi | 63% | 2411 fps | 97.1% |
| Hodgdon H414 | 62.4 gr | 88% | 41,394 psi | 66% | 2507 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 90% | 47,964 psi | 77% | 2575 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 46,311 psi | 74% | 2530 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,615 psi | 44% | 2172 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,221 psi | 68% | 2507 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 90% | 43,816 psi | 70% | 2572 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,527 psi | 43% | 1434 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,353 psi | 71% | 2484 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 46,050 psi | 74% | 2520 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,814 psi | 65% | 2408 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,337 psi | 69% | 2431 fps | 95.9% |
| IMR 4350 | <<locked>> | 92% | 44,556 psi | 71% | 2503 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 40,785 psi | 65% | 2411 fps | 95% |
| IMR 4831 | <<locked>> | 84% | 32,692 psi | 52% | 2313 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 42,583 psi | 68% | 2490 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 47,935 psi | 77% | 2523 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,991 psi | 72% | 2497 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,759 psi | 73% | 2457 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 40,944 psi | 66% | 2415 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 35,737 psi | 57% | 2313 fps | 95% |
| Lovex S070 | <<locked>> | 88% | 40,799 psi | 65% | 2438 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 44,976 psi | 72% | 2474 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 45,295 psi | 73% | 2480 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,944 psi | 66% | 2451 fps | 99% |
| Norma 204 | <<locked>> | 96% | 50,763 psi | 81% | 2644 fps | 95.7% |
| Norma MRP | <<locked>> | 98% | 41,626 psi | 67% | 2582 fps | 95.1% |
| Norma URP | <<locked>> | 82% | 31,923 psi | 51% | 2303 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 40,466 psi | 65% | 2464 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 37,942 psi | 61% | 2444 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 47,747 psi | 77% | 2536 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,224 psi | 76% | 2549 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,576 psi | 83% | 2569 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,977 psi | 43% | 1470 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,566 psi | 63% | 2395 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,859 psi | 70% | 2562 fps | 99.1% |
| ReloadSwiss RS 60 | 58 gr | 80% | 35,578 psi | 57% | 2438 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 33,489 psi | 54% | 2365 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 35,911 psi | 58% | 2428 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 48,921 psi | 78% | 2507 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,801 psi | 69% | 2431 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 36,172 psi | 58% | 2356 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 88% | 44,512 psi | 71% | 2480 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 82% | 35,737 psi | 57% | 2313 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,991 psi | 72% | 2497 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,944 psi | 66% | 2415 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 40,799 psi | 65% | 2438 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,086 psi | 59% | 2402 fps | 98.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,137 psi | 74% | 2513 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,324 psi | 71% | 2493 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,253 psi | 74% | 2425 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,580 psi | 62% | 2303 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 42,409 psi | 68% | 2408 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 51,866 psi | 83% | 2598 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,876 psi | 74% | 2425 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,919 psi | 74% | 2507 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 36,999 psi | 59% | 2362 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 26,905 psi | 43% | 2208 fps | 96.6% |
| Somchem S385 | <<locked>> | 98% | 44,788 psi | 72% | 2546 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 52,112 psi | 84% | 2474 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,615 psi | 75% | 2415 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,395 psi | 68% | 2408 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,902 psi | 69% | 2418 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,172 psi | 56% | 2303 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 33,272 psi | 53% | 2303 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 48,080 psi | 77% | 2523 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,292 psi | 66% | 2411 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 32,866 psi | 53% | 2306 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 88% | 29,689 psi | 48% | 2297 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,096 psi | 50% | 2234 fps | 97% |
| Winchester 748 | <<locked>> | 80% | 47,659 psi | 76% | 2562 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 41,394 psi | 66% | 2507 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,659 psi | 44% | 2293 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,845 psi | 70% | 2497 fps | 99.7% |
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 116 powders for .338 Win Mag. loaded with the .338 | 225gr | Woodleigh HS. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,779 fps; across all powders the maximum-charge window runs from 1,608 fps to 2,779 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 56–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, ADI AR 2213 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, Hodgdon H414 rank at the top here: for .338 Win Mag. with the .338 | 225gr | Woodleigh HS they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2213, Alliant Reloder-22, Alliant Reloder-25 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.