Load Specifications
Load data in caliber .338 Win Mag. with .338 | 225gr | Hornady InterLock 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% | 55,390 psi | 89% | 2562 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 53,650 psi | 86% | 2585 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,753 psi | 89% | 2651 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 53,272 psi | 85% | 2595 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,814 psi | 65% | 2493 fps | 96.5% |
| Accurate 4064 | <<locked>> | 90% | 53,853 psi | 86% | 2635 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,722 psi | 86% | 2717 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 54,505 psi | 87% | 2664 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,579 psi | 89% | 2667 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,548 psi | 86% | 2618 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,447 psi | 87% | 2589 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,201 psi | 87% | 2779 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,695 psi | 89% | 2687 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,115 psi | 90% | 2707 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,274 psi | 89% | 2772 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 52,750 psi | 85% | 2756 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,233 psi | 63% | 2526 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,787 psi | 70% | 2677 fps | 98.6% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,404 psi | 87% | 2684 fps | 99.8% |
| Bofors RP3 | <<locked>> | 92% | 56,101 psi | 90% | 2700 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,333 psi | 90% | 2680 fps | 98.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,216 psi | 89% | 2598 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,391 psi | 90% | 2694 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,940 psi | 88% | 2743 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 53,606 psi | 86% | 2667 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 96% | 53,345 psi | 86% | 2720 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 94% | 53,940 psi | 86% | 2680 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 86% | 55,042 psi | 88% | 2674 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,358 psi | 82% | 2654 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,723 psi | 88% | 2710 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,737 psi | 86% | 2753 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,418 psi | 57% | 1611 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,391 psi | 90% | 2677 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,201 psi | 89% | 2654 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,230 psi | 89% | 2651 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,042 psi | 88% | 2635 fps | 98.3% |
| IMR 4350 | <<locked>> | 98% | 53,084 psi | 85% | 2651 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,795 psi | 88% | 2657 fps | 98.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,244 psi | 87% | 2707 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 54,027 psi | 87% | 2687 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 53,548 psi | 86% | 2618 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,273 psi | 87% | 2641 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,172 psi | 87% | 2598 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 54,766 psi | 88% | 2644 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,143 psi | 87% | 2654 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 54,984 psi | 88% | 2687 fps | 98.5% |
| Norma 201 | <<locked>> | 86% | 53,098 psi | 85% | 2612 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,969 psi | 87% | 2615 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,288 psi | 89% | 2697 fps | 100% |
| Norma 204 | <<locked>> | 98% | 53,606 psi | 86% | 2700 fps | 96.4% |
| Norma MRPᴾ | <<locked>> | 100% | 43,801 psi | 70% | 2638 fps | 96% |
| Norma URP | <<locked>> | 98% | 53,069 psi | 85% | 2710 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 90% | 56,057 psi | 90% | 2723 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,419 psi | 89% | 2756 fps | 99.1% |
| Ramshot TAC | <<locked>> | 84% | 53,722 psi | 86% | 2638 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 84% | 53,301 psi | 85% | 2654 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,375 psi | 87% | 2621 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,969 psi | 58% | 1650 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,838 psi | 86% | 2651 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 53,171 psi | 85% | 2720 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,304 psi | 90% | 2805 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 53,577 psi | 86% | 2743 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,287 psi | 85% | 2769 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 84% | 54,012 psi | 87% | 2592 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,621 psi | 86% | 2612 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,970 psi | 90% | 2694 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,333 psi | 90% | 2680 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,143 psi | 87% | 2654 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,273 psi | 87% | 2641 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,766 psi | 88% | 2644 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,984 psi | 88% | 2687 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,302 psi | 87% | 2707 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,767 psi | 89% | 2667 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 53,040 psi | 85% | 2641 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,911 psi | 88% | 2556 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,013 psi | 88% | 2552 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,447 psi | 87% | 2608 fps | 98.2% |
| Somchem S321 | <<locked>> | 82% | 54,694 psi | 88% | 2648 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,085 psi | 87% | 2552 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,506 psi | 89% | 2661 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 56,318 psi | 90% | 2690 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,792 psi | 81% | 2707 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 47,253 psi | 76% | 2598 fps | 96.4% |
| Vihtavuori N130 | <<locked>> | 82% | 54,505 psi | 87% | 2513 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,274 psi | 89% | 2539 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 53,563 psi | 86% | 2575 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,534 psi | 87% | 2595 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,288 psi | 87% | 2625 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,593 psi | 89% | 2707 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 54,070 psi | 87% | 2618 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,014 psi | 90% | 2638 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,491 psi | 87% | 2710 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,989 psi | 69% | 2595 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,825 psi | 90% | 2684 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,099 psi | 87% | 2664 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 53,345 psi | 86% | 2720 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,012 psi | 56% | 2530 fps | 99.2% |
| Winchester StaBALL Match | <<locked>> | 86% | 52,808 psi | 85% | 2648 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% | 48,820 psi | 78% | 2477 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,046 psi | 66% | 2405 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,675 psi | 78% | 2556 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 43,598 psi | 70% | 2438 fps | 95.1% |
| Accurate 3100 | <<locked>> | 98% | 38,043 psi | 61% | 2441 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 38,870 psi | 62% | 2402 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 32,764 psi | 53% | 2343 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 44,976 psi | 72% | 2516 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 38,305 psi | 61% | 2375 fps | 98% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,137 psi | 76% | 2523 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 47,674 psi | 76% | 2503 fps | 100% |
| Alliant Power Pro 2000-MR | 59.5 gr | 80% | 41,104 psi | 66% | 2552 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,855 psi | 61% | 2395 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,654 psi | 65% | 2457 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,256 psi | 50% | 2303 fps | 95% |
| Alliant Reloder-17 | 58.6 gr | 80% | 32,677 psi | 52% | 2369 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,703 psi | 46% | 2267 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,317 psi | 57% | 2493 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,396 psi | 71% | 2526 fps | 98.9% |
| Bofors RP3 | <<locked>> | 80% | 37,304 psi | 60% | 2398 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 43,758 psi | 70% | 2477 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,921 psi | 78% | 2510 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,064 psi | 74% | 2546 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,198 psi | 82% | 2687 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 80% | 38,392 psi | 62% | 2405 fps | 97% |
| Hodgdon H414 | <<locked>> | 88% | 40,625 psi | 65% | 2500 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 90% | 47,500 psi | 76% | 2579 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 45,440 psi | 73% | 2526 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,616 psi | 46% | 2211 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,495 psi | 67% | 2503 fps | 99.7% |
| Hodgdon Superformance | 69.6 gr | 90% | 43,134 psi | 69% | 2569 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,324 psi | 42% | 1437 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,801 psi | 70% | 2484 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 45,426 psi | 73% | 2520 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,219 psi | 64% | 2408 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,757 psi | 69% | 2431 fps | 95.8% |
| IMR 4350 | <<locked>> | 92% | 44,048 psi | 71% | 2503 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 42,786 psi | 69% | 2461 fps | 95.7% |
| IMR 4831 | <<locked>> | 84% | 32,010 psi | 51% | 2306 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 41,669 psi | 67% | 2484 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 47,137 psi | 76% | 2523 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,077 psi | 71% | 2493 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,034 psi | 72% | 2454 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 40,016 psi | 64% | 2408 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 37,275 psi | 60% | 2359 fps | 95.7% |
| Lovex S070 | <<locked>> | 88% | 40,103 psi | 64% | 2434 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 43,947 psi | 70% | 2467 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 44,382 psi | 71% | 2474 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,001 psi | 64% | 2444 fps | 98.9% |
| Norma 204 | <<locked>> | 96% | 50,125 psi | 80% | 2644 fps | 95.7% |
| Norma MRP | <<locked>> | 98% | 41,046 psi | 66% | 2582 fps | 95.1% |
| Norma URP | <<locked>> | 84% | 33,359 psi | 53% | 2346 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 39,740 psi | 64% | 2461 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 37,130 psi | 60% | 2434 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 47,065 psi | 75% | 2533 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,746 psi | 75% | 2552 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,908 psi | 82% | 2569 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,716 psi | 43% | 1473 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,812 psi | 62% | 2388 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,163 psi | 69% | 2559 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,867 psi | 56% | 2434 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 32,605 psi | 52% | 2356 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 35,143 psi | 56% | 2418 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 47,747 psi | 77% | 2500 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,771 psi | 67% | 2421 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 35,099 psi | 56% | 2346 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 43,758 psi | 70% | 2477 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,275 psi | 60% | 2359 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,077 psi | 71% | 2493 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,016 psi | 64% | 2408 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 40,103 psi | 64% | 2434 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,361 psi | 58% | 2398 fps | 98% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,295 psi | 73% | 2507 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,642 psi | 70% | 2490 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,469 psi | 73% | 2421 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,811 psi | 61% | 2300 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,785 psi | 67% | 2408 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 51,097 psi | 82% | 2598 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,947 psi | 72% | 2421 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,194 psi | 72% | 2507 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 35,998 psi | 58% | 2352 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 25,976 psi | 42% | 2192 fps | 96.1% |
| Somchem S385 | <<locked>> | 98% | 44,005 psi | 71% | 2543 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 51,358 psi | 82% | 2474 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,876 psi | 74% | 2415 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,481 psi | 67% | 2405 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,032 psi | 67% | 2415 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,243 psi | 55% | 2293 fps | 99% |
| Vihtavuori N160 | <<locked>> | 82% | 32,561 psi | 52% | 2297 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 47,210 psi | 76% | 2516 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,582 psi | 65% | 2408 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,243 psi | 55% | 2349 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 90% | 30,777 psi | 49% | 2336 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,356 psi | 49% | 2228 fps | 96.8% |
| Winchester 748 | <<locked>> | 80% | 47,224 psi | 76% | 2566 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 40,799 psi | 65% | 2503 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,747 psi | 46% | 2343 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,134 psi | 69% | 2493 fps | 99.6% |
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 | Hornady InterLock. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,805 fps; across all powders the maximum-charge window runs from 1,611 fps to 2,805 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 56–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:16.5 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 | Hornady InterLock 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.