Load Specifications
Load data in caliber .338 Win Mag. with .338 | 225gr | Speer Grand Slam bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, 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>> | 82% | 54,404 psi | 87% | 2552 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 53,417 psi | 86% | 2582 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,940 psi | 88% | 2641 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,593 psi | 89% | 2635 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,932 psi | 70% | 2549 fps | 97.4% |
| Accurate 4064 | <<locked>> | 88% | 53,548 psi | 86% | 2628 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 53,243 psi | 85% | 2713 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 53,563 psi | 86% | 2654 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 54,578 psi | 88% | 2657 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 51,590 psi | 83% | 2690 fps | 96.3% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,854 psi | 90% | 2654 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 53,679 psi | 86% | 2582 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 53,214 psi | 85% | 2769 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,621 psi | 88% | 2674 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,332 psi | 89% | 2700 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,404 psi | 87% | 2766 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,753 psi | 89% | 2799 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 50,560 psi | 81% | 2680 fps | 96.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,626 psi | 67% | 2572 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,688 psi | 75% | 2733 fps | 99.2% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 53,272 psi | 85% | 2671 fps | 99.8% |
| Bofors RP3 | <<locked>> | 90% | 55,390 psi | 89% | 2694 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,230 psi | 89% | 2667 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,143 psi | 87% | 2589 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,317 psi | 89% | 2684 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 56,231 psi | 90% | 2707 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 96% | 55,999 psi | 90% | 2762 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 92% | 52,939 psi | 85% | 2671 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 84% | 54,099 psi | 87% | 2664 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,157 psi | 87% | 2694 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 53,693 psi | 86% | 2697 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 52,634 psi | 84% | 2743 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,781 psi | 57% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,143 psi | 88% | 2664 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 54,389 psi | 87% | 2644 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 54,041 psi | 87% | 2641 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 53,737 psi | 86% | 2621 fps | 98.3% |
| IMR 4350 | <<locked>> | 98% | 55,506 psi | 89% | 2694 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 53,635 psi | 86% | 2648 fps | 98.2% |
| IMR 4831 | <<locked>> | 98% | 53,838 psi | 86% | 2707 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 53,142 psi | 85% | 2674 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,854 psi | 90% | 2654 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 53,316 psi | 85% | 2631 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,362 psi | 90% | 2635 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 54,143 psi | 87% | 2638 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 53,287 psi | 85% | 2644 fps | 99.1% |
| Lovex S070 | <<locked>> | 96% | 54,099 psi | 87% | 2677 fps | 98.5% |
| Norma 201 | <<locked>> | 86% | 55,753 psi | 89% | 2651 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,217 psi | 90% | 2648 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,534 psi | 87% | 2687 fps | 100% |
| Norma 204 | <<locked>> | 98% | 56,304 psi | 90% | 2746 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 46,601 psi | 75% | 2694 fps | 97% |
| Norma URP | <<locked>> | 98% | 55,883 psi | 90% | 2753 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 55,056 psi | 88% | 2713 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 54,462 psi | 87% | 2749 fps | 99.1% |
| Ramshot TAC | <<locked>> | 84% | 56,014 psi | 90% | 2677 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,796 psi | 89% | 2690 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,376 psi | 58% | 1663 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 52,881 psi | 85% | 2641 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,782 psi | 89% | 2759 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,448 psi | 89% | 2795 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 52,939 psi | 85% | 2736 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,912 psi | 90% | 2815 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 53,330 psi | 86% | 2582 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,231 psi | 90% | 2648 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 55,259 psi | 89% | 2687 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 49,182 psi | 79% | 2661 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 94% | 55,230 psi | 89% | 2667 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 94% | 53,287 psi | 85% | 2644 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 53,316 psi | 85% | 2631 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 54,143 psi | 87% | 2638 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 54,099 psi | 87% | 2677 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 53,403 psi | 86% | 2697 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,650 psi | 88% | 2657 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,303 psi | 89% | 2674 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 53,606 psi | 86% | 2543 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 54,012 psi | 87% | 2543 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 53,301 psi | 85% | 2598 fps | 98.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 48,704 psi | 78% | 2654 fps | 96% |
| Somchem S335 | <<locked>> | 84% | 53,185 psi | 85% | 2543 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,273 psi | 87% | 2648 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 55,521 psi | 89% | 2684 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,012 psi | 87% | 2753 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,893 psi | 80% | 2644 fps | 97.1% |
| Vihtavuori N133 | <<locked>> | 84% | 53,969 psi | 87% | 2526 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 56,057 psi | 90% | 2608 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 53,519 psi | 86% | 2585 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 53,417 psi | 86% | 2615 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,737 psi | 88% | 2697 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 52,808 psi | 85% | 2605 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,868 psi | 88% | 2625 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 53,737 psi | 86% | 2703 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,166 psi | 74% | 2648 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,665 psi | 88% | 2674 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 52,895 psi | 85% | 2651 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 56,246 psi | 90% | 2766 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,304 psi | 60% | 2592 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,347 psi | 89% | 2687 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% | 51,329 psi | 82% | 2513 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,048 psi | 71% | 2448 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,401 psi | 82% | 2595 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,844 psi | 69% | 2428 fps | 95.1% |
| Accurate 3100 | <<locked>> | 94% | 35,781 psi | 57% | 2392 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 41,684 psi | 67% | 2448 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 30,690 psi | 49% | 2287 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 47,195 psi | 76% | 2556 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 40,263 psi | 65% | 2418 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 98% | 48,196 psi | 77% | 2635 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,240 psi | 79% | 2559 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,256 psi | 81% | 2536 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,236 psi | 69% | 2598 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,059 psi | 64% | 2438 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,830 psi | 69% | 2497 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,183 psi | 50% | 2303 fps | 95.2% |
| Alliant Reloder-17 | 60 gr | 80% | 34,548 psi | 55% | 2418 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 98% | 47,311 psi | 76% | 2625 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 88% | 28,761 psi | 46% | 2270 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 90% | 32,895 psi | 53% | 2431 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,557 psi | 75% | 2566 fps | 99.3% |
| Bofors RP3 | <<locked>> | 80% | 39,914 psi | 64% | 2448 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 43,192 psi | 69% | 2467 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,981 psi | 82% | 2543 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,530 psi | 78% | 2585 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,553 psi | 65% | 2451 fps | 97.7% |
| Hodgdon H414 | <<locked>> | 86% | 40,190 psi | 64% | 2493 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 88% | 46,804 psi | 75% | 2569 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 47,645 psi | 76% | 2566 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,616 psi | 46% | 2211 fps | 96.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,859 psi | 70% | 2546 fps | 99.9% |
| Hodgdon Superformance | 69.8 gr | 88% | 42,496 psi | 68% | 2562 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,716 psi | 43% | 1450 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,818 psi | 73% | 2520 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 47,703 psi | 76% | 2552 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,308 psi | 68% | 2451 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,614 psi | 72% | 2470 fps | 96.5% |
| IMR 4350 | <<locked>> | 90% | 43,308 psi | 69% | 2497 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,163 psi | 68% | 2451 fps | 95.7% |
| IMR 4831 | <<locked>> | 82% | 31,981 psi | 51% | 2303 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 43,903 psi | 70% | 2526 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 49,240 psi | 79% | 2559 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,760 psi | 75% | 2536 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,021 psi | 75% | 2493 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 42,264 psi | 68% | 2451 fps | 99.8% |
| Lovex S065 | <<locked>> | 80% | 34,780 psi | 56% | 2306 fps | 95% |
| Lovex S070 | <<locked>> | 86% | 39,798 psi | 64% | 2431 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 46,296 psi | 74% | 2510 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,673 psi | 75% | 2510 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,206 psi | 68% | 2487 fps | 99.3% |
| Norma 204 | <<locked>> | 94% | 49,371 psi | 79% | 2638 fps | 95.7% |
| Norma MRP | <<locked>> | 96% | 40,727 psi | 65% | 2579 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 31,111 psi | 50% | 2290 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 42,018 psi | 67% | 2503 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 36,796 psi | 59% | 2431 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 49,153 psi | 79% | 2572 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,994 psi | 79% | 2592 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,151 psi | 44% | 1486 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,756 psi | 65% | 2431 fps | 96.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,527 psi | 73% | 2602 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,767 psi | 59% | 2477 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 32,663 psi | 52% | 2356 fps | 95.4% |
| ReloadSwiss RS 70 | 64 gr | 84% | 34,780 psi | 56% | 2415 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 50,386 psi | 81% | 2539 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,135 psi | 71% | 2464 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 37,507 psi | 60% | 2392 fps | 99% |
| Rottweil R 905 | <<locked>> | 98% | 46,108 psi | 74% | 2608 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 86% | 43,192 psi | 69% | 2467 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,780 psi | 56% | 2306 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,760 psi | 75% | 2536 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,264 psi | 68% | 2451 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 39,798 psi | 64% | 2431 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,406 psi | 62% | 2441 fps | 98.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,659 psi | 76% | 2549 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,701 psi | 73% | 2526 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,442 psi | 76% | 2454 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,668 psi | 64% | 2333 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 41,278 psi | 66% | 2402 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 45,672 psi | 73% | 2605 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 47,166 psi | 76% | 2457 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,398 psi | 76% | 2546 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 38,232 psi | 61% | 2398 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 27,862 psi | 45% | 2247 fps | 97.3% |
| Somchem S385 | <<locked>> | 96% | 43,758 psi | 70% | 2539 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 47,848 psi | 77% | 2444 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,714 psi | 70% | 2441 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,222 psi | 71% | 2451 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,347 psi | 58% | 2336 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 32,387 psi | 52% | 2293 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 49,588 psi | 80% | 2559 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,670 psi | 68% | 2444 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 31,995 psi | 51% | 2297 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 86% | 29,080 psi | 47% | 2290 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,126 psi | 52% | 2270 fps | 97.6% |
| Winchester 748 | <<locked>> | 80% | 49,458 psi | 79% | 2602 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 40,335 psi | 65% | 2497 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 90% | 27,093 psi | 43% | 2290 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,426 psi | 73% | 2536 fps | 99.8% |
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 | Speer Grand Slam. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,815 fps; across all powders the maximum-charge window runs from 1,624 fps to 2,815 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 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .338 Win Mag. with the .338 | 225gr | Speer Grand Slam 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.