Load Specifications
Load data in caliber .338 Win Mag. with .338 | 225gr | Sierra Pro-Hunter 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 ReloadSwiss RS 70.
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% | 56,202 psi | 90% | 2562 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,795 psi | 88% | 2589 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 52,924 psi | 85% | 2605 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 53,838 psi | 86% | 2592 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,872 psi | 67% | 2500 fps | 96.6% |
| Accurate 4064 | <<locked>> | 90% | 54,911 psi | 88% | 2635 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,636 psi | 88% | 2720 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 55,201 psi | 89% | 2664 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 56,246 psi | 90% | 2664 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,172 psi | 87% | 2618 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,143 psi | 88% | 2589 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,694 psi | 88% | 2779 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,260 psi | 90% | 2687 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 53,476 psi | 86% | 2661 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,593 psi | 89% | 2769 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 53,403 psi | 86% | 2756 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,827 psi | 64% | 2526 fps | 99.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,512 psi | 71% | 2680 fps | 98.7% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,897 psi | 88% | 2680 fps | 99.8% |
| Bofors RP3 | <<locked>> | 90% | 53,301 psi | 85% | 2651 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 53,447 psi | 86% | 2628 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,782 psi | 89% | 2598 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 53,534 psi | 86% | 2644 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,419 psi | 89% | 2740 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 54,273 psi | 87% | 2667 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 96% | 53,751 psi | 86% | 2717 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 94% | 54,476 psi | 87% | 2680 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 86% | 55,811 psi | 89% | 2674 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,996 psi | 83% | 2651 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,216 psi | 89% | 2707 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,288 psi | 87% | 2753 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,708 psi | 57% | 1608 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 53,519 psi | 86% | 2628 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,927 psi | 90% | 2654 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,637 psi | 89% | 2648 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,709 psi | 89% | 2635 fps | 98.3% |
| IMR 4350 | <<locked>> | 98% | 53,679 psi | 86% | 2651 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,245 psi | 89% | 2654 fps | 98.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,998 psi | 88% | 2710 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 54,853 psi | 88% | 2687 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,172 psi | 87% | 2618 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,998 psi | 88% | 2641 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,781 psi | 88% | 2595 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 55,680 psi | 89% | 2644 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,592 psi | 88% | 2648 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 55,506 psi | 89% | 2684 fps | 98.5% |
| Norma 201 | <<locked>> | 86% | 53,969 psi | 87% | 2612 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,476 psi | 87% | 2612 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,898 psi | 90% | 2694 fps | 100% |
| Norma 204 | <<locked>> | 98% | 54,215 psi | 87% | 2700 fps | 96.5% |
| Norma MRPᴾ | <<locked>> | 100% | 44,643 psi | 72% | 2641 fps | 96.1% |
| Norma URP | <<locked>> | 98% | 53,519 psi | 86% | 2703 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 88% | 52,895 psi | 85% | 2671 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,869 psi | 90% | 2753 fps | 99.1% |
| Ramshot TAC | <<locked>> | 84% | 54,244 psi | 87% | 2635 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,041 psi | 87% | 2654 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,839 psi | 88% | 2618 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,114 psi | 58% | 1644 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,418 psi | 87% | 2648 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 53,737 psi | 86% | 2720 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 53,069 psi | 85% | 2753 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,114 psi | 87% | 2740 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,766 psi | 86% | 2766 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 84% | 55,027 psi | 88% | 2592 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,563 psi | 87% | 2612 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 53,156 psi | 85% | 2644 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 53,447 psi | 86% | 2628 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,592 psi | 88% | 2648 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,998 psi | 88% | 2641 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,680 psi | 89% | 2644 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,506 psi | 89% | 2684 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,882 psi | 88% | 2703 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 52,721 psi | 85% | 2615 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 53,519 psi | 86% | 2638 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,564 psi | 89% | 2552 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,709 psi | 89% | 2552 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,853 psi | 88% | 2605 fps | 98.2% |
| Somchem S321 | <<locked>> | 82% | 55,245 psi | 89% | 2648 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,839 psi | 88% | 2552 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,014 psi | 90% | 2657 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 53,490 psi | 86% | 2644 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,576 psi | 83% | 2710 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 47,921 psi | 77% | 2598 fps | 96.4% |
| Vihtavuori N130 | <<locked>> | 82% | 55,085 psi | 88% | 2513 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,825 psi | 90% | 2539 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,360 psi | 87% | 2575 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,984 psi | 88% | 2592 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,940 psi | 88% | 2621 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,217 psi | 90% | 2703 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 54,534 psi | 87% | 2615 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 53,142 psi | 85% | 2592 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,984 psi | 88% | 2707 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,845 psi | 70% | 2602 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,333 psi | 90% | 2684 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,549 psi | 87% | 2661 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,012 psi | 87% | 2720 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,679 psi | 57% | 2536 fps | 99.3% |
| Winchester StaBALL Match | <<locked>> | 86% | 53,403 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% | 49,588 psi | 80% | 2477 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,322 psi | 68% | 2411 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,371 psi | 79% | 2556 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 44,367 psi | 71% | 2441 fps | 95.2% |
| Accurate 3100 | <<locked>> | 96% | 36,434 psi | 58% | 2395 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 40,016 psi | 64% | 2411 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 31,473 psi | 50% | 2300 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 45,658 psi | 73% | 2516 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 38,899 psi | 62% | 2379 fps | 98% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,747 psi | 77% | 2520 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 48,312 psi | 77% | 2503 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,582 psi | 67% | 2552 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,580 psi | 62% | 2402 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,379 psi | 66% | 2457 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,908 psi | 51% | 2310 fps | 95.2% |
| Alliant Reloder-17 | 57.9 gr | 80% | 33,272 psi | 53% | 2375 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,414 psi | 47% | 2277 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 92% | 33,779 psi | 54% | 2444 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,875 psi | 72% | 2523 fps | 98.9% |
| Bofors RP3 | <<locked>> | 80% | 38,261 psi | 61% | 2405 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 44,367 psi | 71% | 2477 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,516 psi | 79% | 2510 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,673 psi | 75% | 2546 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,692 psi | 83% | 2684 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 80% | 39,044 psi | 63% | 2408 fps | 97.1% |
| Hodgdon H414 | <<locked>> | 88% | 41,234 psi | 66% | 2503 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 90% | 48,008 psi | 77% | 2575 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 46,122 psi | 74% | 2526 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,499 psi | 44% | 2169 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,206 psi | 68% | 2507 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 90% | 43,859 psi | 70% | 2575 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,542 psi | 43% | 1434 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,367 psi | 71% | 2484 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 46,093 psi | 74% | 2520 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,857 psi | 66% | 2411 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,366 psi | 70% | 2431 fps | 95.9% |
| IMR 4350 | <<locked>> | 92% | 44,599 psi | 72% | 2507 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 40,785 psi | 65% | 2411 fps | 95% |
| IMR 4831 | <<locked>> | 84% | 32,706 psi | 52% | 2313 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 42,409 psi | 68% | 2487 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 47,747 psi | 77% | 2520 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,005 psi | 72% | 2497 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,571 psi | 73% | 2454 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 40,785 psi | 65% | 2415 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 35,723 psi | 57% | 2316 fps | 95% |
| Lovex S070 | <<locked>> | 88% | 40,814 psi | 65% | 2438 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 44,773 psi | 72% | 2470 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 45,107 psi | 72% | 2477 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,756 psi | 65% | 2448 fps | 99% |
| Norma 204 | <<locked>> | 96% | 50,517 psi | 81% | 2641 fps | 95.6% |
| Norma MRP | <<locked>> | 98% | 41,684 psi | 67% | 2585 fps | 95.2% |
| Norma URP | <<locked>> | 82% | 31,952 psi | 51% | 2303 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 40,335 psi | 65% | 2461 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 37,797 psi | 61% | 2438 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 47,761 psi | 77% | 2536 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,268 psi | 76% | 2549 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,590 psi | 83% | 2572 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,977 psi | 43% | 1470 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,552 psi | 63% | 2395 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,656 psi | 70% | 2556 fps | 99.1% |
| ReloadSwiss RS 60 | 57.9 gr | 80% | 35,418 psi | 57% | 2438 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 33,518 psi | 54% | 2369 fps | 95.5% |
| ReloadSwiss RS 70 | 63.3 gr | 86% | 35,940 psi | 58% | 2428 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 48,907 psi | 78% | 2507 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,786 psi | 69% | 2431 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 36,042 psi | 58% | 2352 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 88% | 44,367 psi | 71% | 2477 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 82% | 35,723 psi | 57% | 2316 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,005 psi | 72% | 2497 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,785 psi | 65% | 2415 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 40,814 psi | 65% | 2438 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,927 psi | 59% | 2398 fps | 98.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,180 psi | 74% | 2510 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,150 psi | 71% | 2490 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,064 psi | 74% | 2421 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,392 psi | 62% | 2300 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 42,467 psi | 68% | 2408 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 51,663 psi | 83% | 2595 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,672 psi | 73% | 2425 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,701 psi | 73% | 2503 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 36,825 psi | 59% | 2359 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 26,803 psi | 43% | 2205 fps | 96.5% |
| Somchem S385 | <<locked>> | 98% | 44,831 psi | 72% | 2546 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 51,909 psi | 83% | 2470 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,427 psi | 74% | 2411 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,235 psi | 68% | 2405 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,714 psi | 68% | 2415 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,027 psi | 56% | 2297 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 33,301 psi | 53% | 2303 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 47,877 psi | 77% | 2520 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,118 psi | 66% | 2408 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 32,851 psi | 53% | 2306 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 88% | 29,689 psi | 48% | 2297 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,966 psi | 50% | 2231 fps | 96.9% |
| Winchester 748 | <<locked>> | 80% | 47,703 psi | 76% | 2562 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 41,408 psi | 66% | 2507 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,702 psi | 44% | 2293 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,656 psi | 70% | 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 | Sierra Pro-Hunter. 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 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 1:15.5 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 Reloder-17, ReloadSwiss RS 60, ReloadSwiss RS 70 rank at the top here: for .338 Win Mag. with the .338 | 225gr | Sierra Pro-Hunter 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.