Load Specifications
Load data in caliber .338 Win Mag. with .338 | 225gr | Speer Deep Curl Soft Point 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 Winchester 760.
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% | 53,345 psi | 86% | 2530 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,477 psi | 89% | 2598 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 53,330 psi | 86% | 2612 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,360 psi | 87% | 2605 fps | 97.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,337 psi | 68% | 2513 fps | 96.8% |
| Accurate 4064 | <<locked>> | 90% | 55,303 psi | 89% | 2644 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,201 psi | 89% | 2733 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 55,593 psi | 89% | 2674 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 53,374 psi | 86% | 2628 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,563 psi | 87% | 2625 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,608 psi | 89% | 2598 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,274 psi | 89% | 2789 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 53,388 psi | 86% | 2648 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 53,809 psi | 86% | 2667 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,347 psi | 90% | 2782 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 53,896 psi | 86% | 2766 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,422 psi | 65% | 2539 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,063 psi | 72% | 2694 fps | 98.8% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,463 psi | 89% | 2690 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 53,867 psi | 86% | 2664 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 53,954 psi | 87% | 2638 fps | 97.7% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,188 psi | 90% | 2605 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 53,867 psi | 86% | 2654 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,057 psi | 90% | 2753 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 54,824 psi | 88% | 2677 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 96% | 54,244 psi | 87% | 2726 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 94% | 54,955 psi | 88% | 2690 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 86% | 56,173 psi | 90% | 2684 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,533 psi | 84% | 2664 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,579 psi | 89% | 2713 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,882 psi | 88% | 2766 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,737 psi | 57% | 1611 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 53,896 psi | 86% | 2638 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 56,362 psi | 90% | 2661 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,246 psi | 90% | 2657 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,999 psi | 90% | 2641 fps | 98.4% |
| IMR 4350 | <<locked>> | 98% | 54,143 psi | 87% | 2664 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,724 psi | 89% | 2667 fps | 98.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,579 psi | 89% | 2720 fps | 99.9% |
| IMR 4895 | <<locked>> | 88% | 55,187 psi | 88% | 2697 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,563 psi | 87% | 2625 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,405 psi | 89% | 2651 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,085 psi | 88% | 2605 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,014 psi | 90% | 2654 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,085 psi | 88% | 2657 fps | 99.2% |
| Lovex S070 | <<locked>> | 98% | 55,999 psi | 90% | 2694 fps | 98.6% |
| Norma 201 | <<locked>> | 86% | 54,375 psi | 87% | 2621 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,824 psi | 88% | 2618 fps | 100% |
| Norma 203B | <<locked>> | 88% | 53,055 psi | 85% | 2654 fps | 100% |
| Norma 204 | <<locked>> | 98% | 54,708 psi | 88% | 2710 fps | 96.6% |
| Norma MRPᴾ | <<locked>> | 100% | 44,991 psi | 72% | 2651 fps | 96.3% |
| Norma URP | <<locked>> | 98% | 54,041 psi | 87% | 2717 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 88% | 53,461 psi | 86% | 2680 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,362 psi | 90% | 2766 fps | 99.2% |
| Ramshot TAC | <<locked>> | 84% | 54,723 psi | 88% | 2648 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,360 psi | 87% | 2664 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,405 psi | 89% | 2628 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,129 psi | 58% | 1647 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,911 psi | 88% | 2661 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,375 psi | 87% | 2730 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 53,606 psi | 86% | 2762 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,650 psi | 88% | 2753 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,157 psi | 87% | 2779 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 84% | 55,448 psi | 89% | 2602 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,897 psi | 88% | 2621 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 53,751 psi | 86% | 2657 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 53,954 psi | 87% | 2638 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,085 psi | 88% | 2657 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,405 psi | 89% | 2651 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,014 psi | 90% | 2654 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,999 psi | 90% | 2694 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,434 psi | 89% | 2717 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 53,243 psi | 85% | 2628 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,085 psi | 87% | 2648 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,970 psi | 90% | 2562 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,028 psi | 90% | 2559 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,303 psi | 89% | 2615 fps | 98.3% |
| Somchem S321 | <<locked>> | 82% | 55,811 psi | 89% | 2657 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,158 psi | 88% | 2559 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 52,895 psi | 85% | 2618 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,041 psi | 87% | 2654 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,083 psi | 84% | 2720 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,327 psi | 77% | 2608 fps | 96.6% |
| Vihtavuori N130 | <<locked>> | 82% | 55,521 psi | 89% | 2520 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,231 psi | 90% | 2546 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,824 psi | 88% | 2585 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,317 psi | 89% | 2602 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,506 psi | 89% | 2631 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 53,171 psi | 85% | 2667 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 84% | 55,158 psi | 88% | 2628 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 53,476 psi | 86% | 2598 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,724 psi | 89% | 2720 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,353 psi | 71% | 2612 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 53,214 psi | 85% | 2644 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,158 psi | 88% | 2671 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,505 psi | 87% | 2730 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,998 psi | 58% | 2549 fps | 99.4% |
| Winchester StaBALL Match | <<locked>> | 86% | 53,925 psi | 86% | 2657 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% | 50,024 psi | 80% | 2487 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,772 psi | 69% | 2421 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,995 psi | 80% | 2566 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 44,657 psi | 72% | 2448 fps | 95.4% |
| Accurate 3100 | <<locked>> | 96% | 36,883 psi | 59% | 2408 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 40,451 psi | 65% | 2421 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 31,792 psi | 51% | 2310 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 46,035 psi | 74% | 2526 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 39,247 psi | 63% | 2388 fps | 98.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,124 psi | 77% | 2530 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 48,820 psi | 78% | 2510 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,076 psi | 67% | 2566 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,943 psi | 62% | 2408 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,742 psi | 67% | 2470 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 32,184 psi | 52% | 2320 fps | 95.4% |
| Alliant Reloder-17 | 58.5 gr | 80% | 33,707 psi | 54% | 2388 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 27,992 psi | 45% | 2238 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 92% | 34,098 psi | 55% | 2454 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,411 psi | 73% | 2536 fps | 99% |
| Bofors RP3 | <<locked>> | 80% | 38,638 psi | 62% | 2415 fps | 99.3% |
| Bofors RP7 | <<locked>> | 88% | 44,846 psi | 72% | 2487 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,864 psi | 80% | 2516 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,268 psi | 76% | 2556 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,301 psi | 84% | 2697 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 80% | 39,566 psi | 63% | 2421 fps | 97.3% |
| Hodgdon H414 | <<locked>> | 88% | 41,727 psi | 67% | 2513 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 88% | 45,527 psi | 73% | 2536 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 46,499 psi | 75% | 2536 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,775 psi | 45% | 2178 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,598 psi | 68% | 2513 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 90% | 44,222 psi | 71% | 2585 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,629 psi | 43% | 1437 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,730 psi | 72% | 2493 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 46,572 psi | 75% | 2530 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,234 psi | 66% | 2421 fps | 98.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,685 psi | 70% | 2441 fps | 96% |
| IMR 4350 | <<locked>> | 90% | 42,337 psi | 68% | 2467 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 84% | 41,089 psi | 66% | 2421 fps | 95.2% |
| IMR 4831 | <<locked>> | 82% | 31,053 psi | 50% | 2274 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 42,772 psi | 69% | 2497 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 48,124 psi | 77% | 2530 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,397 psi | 73% | 2507 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,948 psi | 74% | 2464 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 41,147 psi | 66% | 2421 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 36,027 psi | 58% | 2323 fps | 95.2% |
| Lovex S070 | <<locked>> | 88% | 41,075 psi | 66% | 2448 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 45,165 psi | 72% | 2480 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 45,498 psi | 73% | 2484 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,118 psi | 66% | 2457 fps | 99.1% |
| Norma 204 | <<locked>> | 94% | 47,776 psi | 77% | 2598 fps | 95% |
| Norma MRP | <<locked>> | 98% | 42,221 psi | 68% | 2598 fps | 95.4% |
| Norma URP | <<locked>> | 82% | 32,256 psi | 52% | 2313 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 40,843 psi | 65% | 2474 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 38,218 psi | 61% | 2451 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 48,080 psi | 77% | 2543 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,790 psi | 77% | 2562 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,895 psi | 83% | 2579 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,890 psi | 43% | 1470 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,885 psi | 64% | 2405 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,295 psi | 71% | 2572 fps | 99.2% |
| ReloadSwiss RS 60 | 58.5 gr | 80% | 35,882 psi | 58% | 2451 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 33,808 psi | 54% | 2379 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 36,143 psi | 58% | 2438 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 49,371 psi | 79% | 2516 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,004 psi | 69% | 2438 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 36,405 psi | 58% | 2362 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 88% | 44,846 psi | 72% | 2487 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 36,027 psi | 58% | 2323 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,397 psi | 73% | 2507 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,147 psi | 66% | 2421 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 41,075 psi | 66% | 2448 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,434 psi | 60% | 2415 fps | 98.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,485 psi | 75% | 2520 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,686 psi | 72% | 2503 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,456 psi | 74% | 2431 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,783 psi | 62% | 2310 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 40,234 psi | 65% | 2372 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 52,243 psi | 84% | 2608 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,064 psi | 74% | 2431 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,238 psi | 74% | 2516 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 37,188 psi | 60% | 2369 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 27,079 psi | 43% | 2215 fps | 96.7% |
| Somchem S385 | <<locked>> | 96% | 42,453 psi | 68% | 2507 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 52,359 psi | 84% | 2480 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,804 psi | 75% | 2421 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,656 psi | 68% | 2415 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,091 psi | 69% | 2425 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,346 psi | 57% | 2306 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 33,591 psi | 54% | 2313 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 48,240 psi | 77% | 2526 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,655 psi | 67% | 2418 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 33,170 psi | 53% | 2316 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 88% | 29,979 psi | 48% | 2306 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,314 psi | 50% | 2244 fps | 97.1% |
| Winchester 748 | <<locked>> | 80% | 48,066 psi | 77% | 2572 fps | 100% |
| Winchester 760 | 63 gr | 88% | 41,930 psi | 67% | 2520 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,992 psi | 45% | 2310 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,193 psi | 71% | 2507 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 98 powders for .338 Win Mag. loaded with the .338 | 225gr | Speer Deep Curl Soft Point. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,789 fps; across all powders the maximum-charge window runs from 1,611 fps to 2,789 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 1:16.0 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 Reloder-17, ReloadSwiss RS 60, Winchester 760 rank at the top here: for .338 Win Mag. with the .338 | 225gr | Speer Deep Curl Soft Point 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.