Load Specifications
Load data in caliber .338 Win Mag. with .338 | 225gr | Frontier PH HPBT 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% | 53,867 psi | 86% | 2520 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,622 psi | 89% | 2592 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 55,724 psi | 89% | 2589 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,172 psi | 87% | 2608 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 55,143 psi | 88% | 2592 fps | 97.2% |
| Accurate 4064 | <<locked>> | 92% | 55,637 psi | 89% | 2631 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 55,187 psi | 88% | 2713 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 88% | 56,347 psi | 90% | 2664 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 54,041 psi | 87% | 2618 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,463 psi | 89% | 2618 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 56,130 psi | 90% | 2589 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,985 psi | 90% | 2779 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 53,867 psi | 86% | 2638 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 54,317 psi | 87% | 2657 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,156 psi | 85% | 2717 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 54,273 psi | 87% | 2753 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,913 psi | 61% | 2470 fps | 98.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,105 psi | 68% | 2615 fps | 97.8% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 56,072 psi | 90% | 2680 fps | 99.8% |
| Bofors RP3 | <<locked>> | 92% | 54,259 psi | 87% | 2651 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 54,447 psi | 87% | 2621 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 84% | 53,838 psi | 86% | 2556 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 54,708 psi | 88% | 2648 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 52,808 psi | 85% | 2687 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 56,144 psi | 90% | 2608 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 55,434 psi | 89% | 2667 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 98% | 54,607 psi | 88% | 2710 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 96% | 55,564 psi | 89% | 2677 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 86% | 53,577 psi | 86% | 2628 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,400 psi | 79% | 2602 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 56,289 psi | 90% | 2707 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 55,288 psi | 89% | 2746 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,346 psi | 57% | 1585 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,665 psi | 88% | 2628 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 53,447 psi | 86% | 2612 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 53,534 psi | 86% | 2602 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 53,621 psi | 86% | 2582 fps | 97.7% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,636 psi | 88% | 2648 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 96% | 56,347 psi | 90% | 2651 fps | 98.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,199 psi | 84% | 2654 fps | 99.6% |
| IMR 4895 | <<locked>> | 90% | 55,695 psi | 89% | 2684 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 55,463 psi | 89% | 2618 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 55,651 psi | 89% | 2605 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 56,144 psi | 90% | 2641 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,898 psi | 90% | 2595 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 53,214 psi | 85% | 2598 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,651 psi | 89% | 2644 fps | 99% |
| Lovex S070 | <<locked>> | 98% | 53,084 psi | 85% | 2628 fps | 97.9% |
| Norma 201 | <<locked>> | 88% | 55,013 psi | 88% | 2612 fps | 100% |
| Norma 202 | <<locked>> | 88% | 55,738 psi | 89% | 2615 fps | 100% |
| Norma 203B | <<locked>> | 90% | 53,563 psi | 86% | 2644 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 55,230 psi | 89% | 2694 fps | 96.2% |
| Norma URPᴾ | <<locked>> | 100% | 54,259 psi | 87% | 2700 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 90% | 53,998 psi | 87% | 2671 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 53,127 psi | 85% | 2700 fps | 98.6% |
| Ramshot TAC | <<locked>> | 86% | 55,622 psi | 89% | 2638 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 86% | 55,303 psi | 89% | 2654 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 56,376 psi | 90% | 2621 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,955 psi | 58% | 1624 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 54,882 psi | 88% | 2598 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,724 psi | 89% | 2648 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 54,737 psi | 88% | 2720 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 54,070 psi | 87% | 2753 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,839 psi | 88% | 2736 fps | 99.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,636 psi | 88% | 2759 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 86% | 56,057 psi | 90% | 2592 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 55,608 psi | 89% | 2608 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 54,099 psi | 87% | 2644 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 54,447 psi | 87% | 2621 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,651 psi | 89% | 2644 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 88% | 56,144 psi | 90% | 2641 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 53,214 psi | 85% | 2598 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 53,084 psi | 85% | 2628 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,854 psi | 90% | 2703 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 54,041 psi | 87% | 2618 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 54,766 psi | 88% | 2638 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 53,432 psi | 86% | 2510 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 53,316 psi | 85% | 2507 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 56,028 psi | 90% | 2602 fps | 98.1% |
| Somchem S321 | <<locked>> | 82% | 53,171 psi | 85% | 2602 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,898 psi | 90% | 2549 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 53,606 psi | 86% | 2608 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 54,447 psi | 87% | 2641 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,704 psi | 78% | 2654 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 56,434 psi | 90% | 2513 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 53,650 psi | 86% | 2497 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 55,230 psi | 89% | 2575 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 56,173 psi | 90% | 2592 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,927 psi | 90% | 2621 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 53,417 psi | 86% | 2651 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 86% | 55,985 psi | 90% | 2618 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 54,201 psi | 87% | 2592 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,985 psi | 90% | 2707 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,147 psi | 66% | 2539 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 53,693 psi | 86% | 2631 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 55,666 psi | 89% | 2661 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 54,868 psi | 88% | 2713 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,895 psi | 54% | 2470 fps | 98.4% |
| Winchester StaBALL Match | <<locked>> | 88% | 54,636 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% | 47,688 psi | 76% | 2438 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,301 psi | 84% | 2546 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,480 psi | 65% | 2372 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,282 psi | 76% | 2510 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 45,469 psi | 73% | 2441 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 38,276 psi | 61% | 2369 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 31,937 psi | 51% | 2300 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 43,888 psi | 70% | 2470 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 37,434 psi | 60% | 2336 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,934 psi | 74% | 2477 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 46,195 psi | 74% | 2464 fps | 100% |
| Alliant Power Pro 2000-MR | 56.3 gr | 80% | 39,885 psi | 64% | 2500 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,028 psi | 59% | 2356 fps | 98.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,653 psi | 64% | 2411 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,532 psi | 52% | 2310 fps | 95.1% |
| Alliant Reloder-17 | 55.4 gr | 80% | 31,836 psi | 51% | 2323 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,733 psi | 48% | 2270 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 36,550 psi | 59% | 2493 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,946 psi | 69% | 2474 fps | 98.3% |
| Bofors RP3 | <<locked>> | 80% | 36,521 psi | 59% | 2359 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 45,252 psi | 73% | 2477 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,718 psi | 77% | 2464 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,759 psi | 72% | 2500 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,342 psi | 79% | 2635 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 80% | 52,707 psi | 85% | 2562 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 37,449 psi | 60% | 2362 fps | 96.3% |
| Hodgdon H414 | <<locked>> | 90% | 42,003 psi | 67% | 2503 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 92% | 48,921 psi | 78% | 2572 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 44,251 psi | 71% | 2480 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,036 psi | 45% | 2172 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,263 psi | 65% | 2457 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 92% | 44,701 psi | 72% | 2572 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,397 psi | 42% | 1414 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,424 psi | 68% | 2434 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 43,888 psi | 70% | 2474 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,305 psi | 63% | 2365 fps | 98.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 41,640 psi | 67% | 2382 fps | 95% |
| IMR 4350 | <<locked>> | 94% | 45,281 psi | 73% | 2500 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 44,280 psi | 71% | 2457 fps | 95.6% |
| IMR 4831 | <<locked>> | 86% | 33,112 psi | 53% | 2313 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 40,596 psi | 65% | 2441 fps | 98.8% |
| IMR 8208 XBR | <<locked>> | 80% | 45,934 psi | 74% | 2477 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 52,083 psi | 84% | 2556 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,902 psi | 69% | 2451 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,092 psi | 71% | 2411 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 39,175 psi | 63% | 2369 fps | 99.3% |
| Lovex S065 | <<locked>> | 84% | 36,448 psi | 58% | 2316 fps | 95% |
| Lovex S070 | <<locked>> | 90% | 41,510 psi | 67% | 2438 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 43,120 psi | 69% | 2428 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 43,424 psi | 70% | 2438 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,030 psi | 63% | 2402 fps | 98.5% |
| Norma 204 | <<locked>> | 98% | 51,605 psi | 83% | 2638 fps | 95.5% |
| Norma URP | <<locked>> | 84% | 32,518 psi | 52% | 2303 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 38,580 psi | 62% | 2415 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 38,508 psi | 62% | 2441 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 45,934 psi | 74% | 2487 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,223 psi | 73% | 2500 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,603 psi | 80% | 2523 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,658 psi | 43% | 1447 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,619 psi | 83% | 2552 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 40,350 psi | 65% | 2395 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,452 psi | 66% | 2507 fps | 98.5% |
| ReloadSwiss RS 60 | 55.4 gr | 80% | 33,866 psi | 54% | 2385 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 33,910 psi | 54% | 2365 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 36,579 psi | 59% | 2425 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 47,079 psi | 75% | 2464 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,959 psi | 66% | 2382 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 34,287 psi | 55% | 2303 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 45,252 psi | 73% | 2477 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 36,448 psi | 58% | 2316 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,902 psi | 69% | 2451 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,175 psi | 63% | 2369 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 41,510 psi | 67% | 2438 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,215 psi | 56% | 2349 fps | 97.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,193 psi | 71% | 2461 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,322 psi | 68% | 2441 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,338 psi | 71% | 2382 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,854 psi | 59% | 2260 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 43,381 psi | 70% | 2408 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 49,559 psi | 79% | 2552 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,092 psi | 71% | 2385 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,714 psi | 70% | 2457 fps | 99.1% |
| Somchem S355 | <<locked>> | 80% | 35,317 psi | 57% | 2313 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 25,512 psi | 41% | 2152 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 50,082 psi | 80% | 2434 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,657 psi | 72% | 2375 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,335 psi | 65% | 2365 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,915 psi | 66% | 2375 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,417 psi | 54% | 2254 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 33,968 psi | 54% | 2306 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 46,093 psi | 74% | 2474 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 39,523 psi | 63% | 2365 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 33,330 psi | 53% | 2306 fps | 95% |
| Vihtavuori N555 | <<locked>> | 92% | 31,894 psi | 51% | 2343 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,675 psi | 48% | 2185 fps | 96% |
| Winchester 748 | <<locked>> | 80% | 45,643 psi | 73% | 2520 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 42,003 psi | 67% | 2503 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,776 psi | 48% | 2346 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,829 psi | 67% | 2448 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 | Frontier PH HPBT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,779 fps; across all powders the maximum-charge window runs from 1,585 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 1:12.5 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 | Frontier PH HPBT 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.