Load Specifications
Load data in caliber .338 Win Mag. with .338 | 225gr | Hornady SST InterLock bullet and 99 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 Alliant Power Pro 2000-MR.
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% | 53,954 psi | 87% | 2523 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,724 psi | 89% | 2592 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 55,840 psi | 90% | 2589 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,273 psi | 87% | 2608 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 55,216 psi | 89% | 2592 fps | 97.2% |
| Accurate 4064 | <<locked>> | 92% | 55,738 psi | 89% | 2635 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 55,245 psi | 89% | 2713 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 53,113 psi | 85% | 2618 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 54,128 psi | 87% | 2618 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,564 psi | 89% | 2618 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 56,260 psi | 90% | 2589 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 56,057 psi | 90% | 2779 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 53,954 psi | 87% | 2641 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 54,404 psi | 87% | 2657 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,214 psi | 85% | 2717 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 54,331 psi | 87% | 2753 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,985 psi | 61% | 2474 fps | 98.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,134 psi | 68% | 2618 fps | 97.8% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 56,144 psi | 90% | 2680 fps | 99.8% |
| Bofors RP3 | <<locked>> | 92% | 54,346 psi | 87% | 2654 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 54,592 psi | 88% | 2625 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 84% | 53,940 psi | 86% | 2556 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 54,795 psi | 88% | 2651 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 52,910 psi | 85% | 2687 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 56,260 psi | 90% | 2608 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 55,506 psi | 89% | 2667 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 98% | 54,665 psi | 88% | 2713 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 96% | 55,666 psi | 89% | 2677 fps | 97% |
| Hodgdon H4895 | <<locked>> | 86% | 53,679 psi | 86% | 2628 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,472 psi | 79% | 2602 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 56,376 psi | 90% | 2707 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 55,666 psi | 89% | 2753 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,491 psi | 57% | 1588 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,752 psi | 88% | 2628 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 53,577 psi | 86% | 2612 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 53,621 psi | 86% | 2602 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 53,693 psi | 86% | 2585 fps | 97.7% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,694 psi | 88% | 2648 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 96% | 56,405 psi | 90% | 2651 fps | 98.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,257 psi | 84% | 2654 fps | 99.6% |
| IMR 4895 | <<locked>> | 90% | 55,796 psi | 89% | 2687 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 55,564 psi | 89% | 2618 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 55,753 psi | 89% | 2605 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 56,246 psi | 90% | 2644 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,999 psi | 90% | 2595 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 53,316 psi | 85% | 2598 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,709 psi | 89% | 2648 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 53,156 psi | 85% | 2631 fps | 97.9% |
| Norma 201 | <<locked>> | 88% | 55,114 psi | 88% | 2612 fps | 100% |
| Norma 202 | <<locked>> | 88% | 55,564 psi | 89% | 2612 fps | 100% |
| Norma 203B | <<locked>> | 90% | 53,650 psi | 86% | 2648 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 55,347 psi | 89% | 2694 fps | 96.3% |
| Norma URPᴾ | <<locked>> | 100% | 54,317 psi | 87% | 2703 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 90% | 54,070 psi | 87% | 2671 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 53,214 psi | 85% | 2700 fps | 98.6% |
| Ramshot TAC | <<locked>> | 86% | 55,709 psi | 89% | 2638 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 86% | 55,390 psi | 89% | 2657 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 52,982 psi | 85% | 2575 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,882 psi | 58% | 1624 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 54,998 psi | 88% | 2598 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,796 psi | 89% | 2651 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 54,839 psi | 88% | 2720 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 54,143 psi | 87% | 2753 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,897 psi | 88% | 2736 fps | 99.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,708 psi | 88% | 2762 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 86% | 56,173 psi | 90% | 2592 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 55,709 psi | 89% | 2612 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 54,215 psi | 87% | 2644 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 54,592 psi | 88% | 2625 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,709 psi | 89% | 2648 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 88% | 56,246 psi | 90% | 2644 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 53,316 psi | 85% | 2598 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 53,156 psi | 85% | 2631 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,941 psi | 90% | 2703 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 54,114 psi | 87% | 2618 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 54,839 psi | 88% | 2641 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 53,548 psi | 86% | 2513 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 53,403 psi | 86% | 2510 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 56,333 psi | 90% | 2605 fps | 98.1% |
| Somchem S321 | <<locked>> | 82% | 53,258 psi | 85% | 2605 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,985 psi | 90% | 2552 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 53,693 psi | 86% | 2608 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 54,534 psi | 87% | 2641 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,805 psi | 78% | 2657 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 53,388 psi | 86% | 2477 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 53,766 psi | 86% | 2500 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 55,347 psi | 89% | 2575 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 56,260 psi | 90% | 2592 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,999 psi | 90% | 2621 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 53,476 psi | 86% | 2651 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 86% | 56,057 psi | 90% | 2618 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 54,288 psi | 87% | 2592 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 56,072 psi | 90% | 2707 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,220 psi | 66% | 2543 fps | 98.6% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 53,722 psi | 86% | 2631 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 55,753 psi | 89% | 2661 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 54,926 psi | 88% | 2717 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,924 psi | 54% | 2470 fps | 98.4% |
| Winchester StaBALL Match | <<locked>> | 88% | 54,752 psi | 88% | 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% | 47,819 psi | 77% | 2438 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,373 psi | 84% | 2549 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,553 psi | 65% | 2375 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,355 psi | 76% | 2513 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 45,542 psi | 73% | 2441 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 38,363 psi | 62% | 2369 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 32,039 psi | 51% | 2303 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 43,990 psi | 71% | 2470 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 37,536 psi | 60% | 2336 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,050 psi | 74% | 2480 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 46,325 psi | 74% | 2464 fps | 100% |
| Alliant Power Pro 2000-MR | 56.4 gr | 80% | 39,972 psi | 64% | 2503 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,927 psi | 59% | 2356 fps | 98.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,726 psi | 64% | 2415 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,605 psi | 52% | 2313 fps | 95.1% |
| Alliant Reloder-17 | 55.5 gr | 80% | 31,908 psi | 51% | 2326 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,791 psi | 48% | 2274 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 36,796 psi | 59% | 2500 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,033 psi | 69% | 2477 fps | 98.4% |
| Bofors RP3 | <<locked>> | 80% | 36,622 psi | 59% | 2359 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 45,324 psi | 73% | 2477 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,834 psi | 77% | 2467 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,860 psi | 72% | 2503 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,443 psi | 79% | 2635 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 80% | 52,823 psi | 85% | 2566 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 37,507 psi | 60% | 2362 fps | 96.3% |
| Hodgdon H414 | <<locked>> | 90% | 42,076 psi | 67% | 2503 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 92% | 48,994 psi | 79% | 2575 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 44,367 psi | 71% | 2484 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,094 psi | 45% | 2172 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,364 psi | 65% | 2457 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 92% | 44,962 psi | 72% | 2575 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,339 psi | 42% | 1414 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,525 psi | 68% | 2438 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 43,947 psi | 70% | 2474 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,378 psi | 63% | 2365 fps | 98.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 41,727 psi | 67% | 2382 fps | 95% |
| IMR 4350 | <<locked>> | 94% | 45,339 psi | 73% | 2500 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 44,367 psi | 71% | 2461 fps | 95.7% |
| IMR 4831 | <<locked>> | 86% | 33,199 psi | 53% | 2313 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 40,669 psi | 65% | 2441 fps | 98.8% |
| IMR 8208 XBR | <<locked>> | 80% | 46,050 psi | 74% | 2480 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 52,185 psi | 84% | 2559 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,004 psi | 69% | 2454 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,193 psi | 71% | 2415 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 39,276 psi | 63% | 2372 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 38,653 psi | 62% | 2362 fps | 95.7% |
| Lovex S070 | <<locked>> | 90% | 41,582 psi | 67% | 2438 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 43,236 psi | 69% | 2431 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 43,294 psi | 69% | 2434 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,088 psi | 63% | 2402 fps | 98.5% |
| Norma 204 | <<locked>> | 98% | 51,648 psi | 83% | 2638 fps | 95.5% |
| Norma URP | <<locked>> | 84% | 32,401 psi | 52% | 2300 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 38,609 psi | 62% | 2415 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 38,624 psi | 62% | 2441 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 45,788 psi | 73% | 2484 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,310 psi | 73% | 2503 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,690 psi | 80% | 2526 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,789 psi | 43% | 1450 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,474 psi | 83% | 2549 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 40,379 psi | 65% | 2395 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,553 psi | 67% | 2507 fps | 98.5% |
| ReloadSwiss RS 60 | 55.5 gr | 80% | 33,939 psi | 54% | 2385 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 33,982 psi | 54% | 2369 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 36,651 psi | 59% | 2428 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 47,210 psi | 76% | 2464 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,060 psi | 66% | 2385 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 34,389 psi | 55% | 2306 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 45,324 psi | 73% | 2477 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 86% | 38,653 psi | 62% | 2362 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,004 psi | 69% | 2454 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,276 psi | 63% | 2372 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 41,582 psi | 67% | 2438 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,302 psi | 57% | 2352 fps | 97.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,280 psi | 71% | 2464 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,380 psi | 68% | 2444 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,454 psi | 71% | 2382 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,941 psi | 59% | 2260 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 43,453 psi | 70% | 2411 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 49,647 psi | 80% | 2552 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,208 psi | 71% | 2388 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,801 psi | 70% | 2457 fps | 99.1% |
| Somchem S355 | <<locked>> | 80% | 35,418 psi | 57% | 2316 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 25,585 psi | 41% | 2156 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 50,169 psi | 80% | 2434 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,773 psi | 72% | 2375 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,451 psi | 65% | 2365 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,017 psi | 66% | 2375 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,489 psi | 54% | 2254 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 34,055 psi | 55% | 2306 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 46,137 psi | 74% | 2477 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 39,610 psi | 64% | 2369 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 33,402 psi | 54% | 2310 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 92% | 31,966 psi | 51% | 2346 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,733 psi | 48% | 2185 fps | 96% |
| Winchester 748 | <<locked>> | 80% | 45,745 psi | 73% | 2520 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 42,076 psi | 67% | 2503 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,936 psi | 48% | 2349 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,916 psi | 67% | 2451 fps | 99.3% |
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 99 powders for .338 Win Mag. loaded with the .338 | 225gr | Hornady SST InterLock. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,779 fps; across all powders the maximum-charge window runs from 1,588 fps to 2,779 fps. Accurate 4350 gives the best case fill at 100 %, and 99 of the 99 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, 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, Alliant Power Pro 2000-MR rank at the top here: for .338 Win Mag. with the .338 | 225gr | Hornady SST 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.