Load Specifications
Load data in caliber .338 Win Mag. with .338 | 231gr | Lapua Naturalis 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% | 54,824 psi | 88% | 2510 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 53,040 psi | 85% | 2533 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,288 psi | 89% | 2598 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,405 psi | 90% | 2592 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,219 psi | 64% | 2441 fps | 96.4% |
| Accurate 4064 | <<locked>> | 90% | 53,113 psi | 85% | 2579 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 52,866 psi | 85% | 2661 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 53,983 psi | 87% | 2612 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,230 psi | 89% | 2615 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,185 psi | 85% | 2566 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 53,853 psi | 86% | 2536 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 53,737 psi | 86% | 2726 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,085 psi | 88% | 2635 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,492 psi | 89% | 2651 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,491 psi | 87% | 2717 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,956 psi | 90% | 2753 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,653 psi | 62% | 2474 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,279 psi | 69% | 2625 fps | 98.6% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 53,708 psi | 86% | 2628 fps | 99.8% |
| Bofors RP3 | <<locked>> | 92% | 55,550 psi | 89% | 2648 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,695 psi | 89% | 2625 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,810 psi | 88% | 2549 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,840 psi | 90% | 2641 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,230 psi | 87% | 2684 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 53,084 psi | 85% | 2615 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 98% | 56,275 psi | 90% | 2717 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 94% | 53,345 psi | 86% | 2628 fps | 97% |
| Hodgdon H4895 | <<locked>> | 86% | 54,505 psi | 87% | 2621 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,778 psi | 81% | 2598 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 53,896 psi | 86% | 2651 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 52,939 psi | 85% | 2694 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,476 psi | 57% | 1578 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,956 psi | 90% | 2625 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,694 psi | 88% | 2602 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,491 psi | 87% | 2595 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,665 psi | 88% | 2582 fps | 98.3% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,941 psi | 90% | 2648 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,360 psi | 87% | 2608 fps | 98.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,505 psi | 86% | 2654 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 53,548 psi | 86% | 2635 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 53,185 psi | 85% | 2566 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 53,577 psi | 86% | 2589 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 53,606 psi | 86% | 2543 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 54,317 psi | 87% | 2592 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,505 psi | 86% | 2598 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 54,215 psi | 87% | 2631 fps | 98.5% |
| Norma 201 | <<locked>> | 88% | 56,072 psi | 90% | 2605 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,345 psi | 86% | 2562 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,665 psi | 88% | 2641 fps | 100% |
| Norma 204 | <<locked>> | 98% | 53,026 psi | 85% | 2644 fps | 96.4% |
| Norma URPᴾ | <<locked>> | 100% | 55,941 psi | 90% | 2703 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 90% | 55,463 psi | 89% | 2667 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,621 psi | 88% | 2703 fps | 99.1% |
| Ramshot TAC | <<locked>> | 84% | 53,214 psi | 85% | 2585 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 84% | 52,939 psi | 85% | 2602 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,969 psi | 87% | 2569 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,839 psi | 57% | 1611 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,956 psi | 90% | 2589 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,417 psi | 86% | 2598 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,231 psi | 90% | 2717 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,506 psi | 89% | 2746 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 52,692 psi | 84% | 2684 fps | 99.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 56,347 psi | 90% | 2769 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 84% | 53,432 psi | 86% | 2536 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 56,420 psi | 90% | 2602 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,201 psi | 89% | 2638 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 55,695 psi | 89% | 2625 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,505 psi | 86% | 2598 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 53,577 psi | 86% | 2589 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,317 psi | 87% | 2592 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,215 psi | 87% | 2631 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 53,664 psi | 86% | 2651 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,288 psi | 89% | 2615 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 55,927 psi | 90% | 2635 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,447 psi | 87% | 2503 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,563 psi | 87% | 2503 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 53,650 psi | 86% | 2552 fps | 98.1% |
| Somchem S321 | <<locked>> | 82% | 54,027 psi | 87% | 2595 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 53,708 psi | 86% | 2503 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,752 psi | 88% | 2605 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 55,796 psi | 89% | 2638 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,053 psi | 80% | 2651 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 46,485 psi | 75% | 2543 fps | 96.3% |
| Vihtavuori N130 | <<locked>> | 82% | 54,099 psi | 87% | 2464 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,781 psi | 88% | 2487 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,362 psi | 90% | 2566 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 53,766 psi | 86% | 2539 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 53,577 psi | 86% | 2569 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 54,781 psi | 88% | 2648 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 53,534 psi | 86% | 2566 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,492 psi | 89% | 2585 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 53,853 psi | 86% | 2657 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,453 psi | 68% | 2543 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,245 psi | 89% | 2631 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 53,345 psi | 86% | 2608 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 56,275 psi | 90% | 2717 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,490 psi | 55% | 2477 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 88% | 55,825 psi | 90% | 2641 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% | 48,341 psi | 78% | 2428 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,654 psi | 65% | 2359 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,080 psi | 77% | 2503 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 43,149 psi | 69% | 2388 fps | 95.1% |
| Accurate 3100 | <<locked>> | 98% | 37,405 psi | 60% | 2388 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 38,479 psi | 62% | 2356 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 32,401 psi | 52% | 2297 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 44,686 psi | 72% | 2467 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 37,985 psi | 61% | 2329 fps | 98% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,847 psi | 75% | 2474 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 47,210 psi | 76% | 2454 fps | 100% |
| Alliant Power Pro 2000-MR | 57.6 gr | 80% | 40,611 psi | 65% | 2500 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,521 psi | 60% | 2349 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,364 psi | 65% | 2408 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,024 psi | 50% | 2260 fps | 95% |
| Alliant Reloder-17 | 56.7 gr | 80% | 32,256 psi | 52% | 2320 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,282 psi | 45% | 2221 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 94% | 34,882 psi | 56% | 2441 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,932 psi | 70% | 2474 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 37,072 psi | 59% | 2352 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 43,308 psi | 69% | 2425 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,414 psi | 78% | 2457 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,542 psi | 73% | 2493 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,473 psi | 81% | 2631 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 80% | 37,811 psi | 61% | 2356 fps | 96.9% |
| Hodgdon H414 | <<locked>> | 88% | 40,118 psi | 64% | 2451 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 90% | 46,963 psi | 75% | 2526 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 45,136 psi | 72% | 2477 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,253 psi | 45% | 2165 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,133 psi | 66% | 2454 fps | 99.7% |
| Hodgdon Superformance | 67.4 gr | 90% | 42,612 psi | 68% | 2520 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,295 psi | 42% | 1404 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,308 psi | 69% | 2431 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 44,730 psi | 72% | 2464 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,871 psi | 64% | 2362 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,351 psi | 68% | 2382 fps | 95.8% |
| IMR 4350 | <<locked>> | 92% | 43,410 psi | 70% | 2451 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 42,351 psi | 68% | 2408 fps | 95.7% |
| IMR 4831 | <<locked>> | 84% | 31,531 psi | 51% | 2257 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 41,365 psi | 66% | 2438 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 46,847 psi | 75% | 2474 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,627 psi | 70% | 2444 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,715 psi | 72% | 2408 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 39,639 psi | 64% | 2362 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 36,738 psi | 59% | 2310 fps | 95.6% |
| Lovex S070 | <<locked>> | 88% | 39,508 psi | 63% | 2382 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 43,569 psi | 70% | 2418 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 44,034 psi | 71% | 2428 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,711 psi | 64% | 2398 fps | 98.9% |
| Norma 204 | <<locked>> | 96% | 49,530 psi | 79% | 2592 fps | 95.6% |
| Norma URP | <<locked>> | 84% | 33,011 psi | 53% | 2303 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 39,291 psi | 63% | 2411 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 36,709 psi | 59% | 2388 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 46,644 psi | 75% | 2484 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,253 psi | 74% | 2500 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,401 psi | 81% | 2520 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,701 psi | 43% | 1440 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,417 psi | 84% | 2543 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,290 psi | 61% | 2339 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,511 psi | 68% | 2503 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,389 psi | 55% | 2382 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 32,256 psi | 52% | 2313 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 34,751 psi | 56% | 2369 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 47,500 psi | 76% | 2454 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,379 psi | 66% | 2375 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 34,809 psi | 56% | 2300 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 43,308 psi | 69% | 2425 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 36,738 psi | 59% | 2310 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,627 psi | 70% | 2444 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,639 psi | 64% | 2362 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 39,508 psi | 63% | 2382 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,839 psi | 57% | 2349 fps | 98% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,831 psi | 72% | 2457 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,076 psi | 69% | 2438 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,034 psi | 72% | 2372 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,405 psi | 60% | 2251 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,220 psi | 66% | 2359 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 50,604 psi | 81% | 2546 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,614 psi | 72% | 2375 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,730 psi | 72% | 2457 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 35,679 psi | 57% | 2306 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 25,744 psi | 41% | 2149 fps | 96.2% |
| Somchem S385 | <<locked>> | 98% | 43,613 psi | 70% | 2493 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 50,865 psi | 82% | 2425 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,440 psi | 73% | 2365 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,017 psi | 66% | 2356 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,742 psi | 67% | 2369 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,939 psi | 54% | 2247 fps | 99% |
| Vihtavuori N160 | <<locked>> | 82% | 32,198 psi | 52% | 2251 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 46,963 psi | 75% | 2470 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 39,972 psi | 64% | 2356 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 33,823 psi | 54% | 2303 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 90% | 30,240 psi | 48% | 2287 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,052 psi | 48% | 2182 fps | 96.8% |
| Winchester 748 | <<locked>> | 80% | 46,630 psi | 75% | 2513 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 40,306 psi | 65% | 2454 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,297 psi | 45% | 2293 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,612 psi | 68% | 2444 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 | 231gr | Lapua Naturalis. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,769 fps; across all powders the maximum-charge window runs from 1,578 fps to 2,769 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 55–90 %, leaving at least 10 % headroom. The 231.0 gr projectile in 0.338" calls for a 1:14.5 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 | 231gr | Lapua Naturalis 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.