Load Specifications
Load data in caliber .338 Win Mag. with .338 | 225gr | Speer TBBC 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.
A valid access license is required to use the Personalized Load Calculator.
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% | 55,288 psi | 89% | 2546 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 53,911 psi | 86% | 2572 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,637 psi | 89% | 2635 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 53,011 psi | 85% | 2572 fps | 97% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,915 psi | 66% | 2480 fps | 96.3% |
| Accurate 4064 | <<locked>> | 90% | 54,070 psi | 87% | 2618 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,388 psi | 86% | 2697 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 54,447 psi | 87% | 2648 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,288 psi | 89% | 2648 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,403 psi | 86% | 2602 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,404 psi | 87% | 2575 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 53,780 psi | 86% | 2759 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,317 psi | 89% | 2667 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,970 psi | 90% | 2690 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,723 psi | 88% | 2749 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,159 psi | 90% | 2789 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,131 psi | 63% | 2507 fps | 99.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,714 psi | 70% | 2657 fps | 98.4% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,027 psi | 87% | 2661 fps | 99.8% |
| Bofors RP3 | <<locked>> | 92% | 55,927 psi | 90% | 2684 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,130 psi | 90% | 2657 fps | 97.8% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,303 psi | 89% | 2585 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,304 psi | 90% | 2677 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,621 psi | 88% | 2723 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 53,359 psi | 86% | 2648 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 96% | 52,866 psi | 85% | 2697 fps | 98% |
| Hodgdon H4350 | <<locked>> | 94% | 53,664 psi | 86% | 2661 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 86% | 55,042 psi | 88% | 2657 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,111 psi | 82% | 2635 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,259 psi | 87% | 2687 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,388 psi | 86% | 2730 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,534 psi | 57% | 1598 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,304 psi | 90% | 2661 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,940 psi | 88% | 2638 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,911 psi | 88% | 2631 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,824 psi | 88% | 2615 fps | 98.1% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,115 psi | 90% | 2680 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,636 psi | 88% | 2638 fps | 98% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,128 psi | 87% | 2690 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 53,853 psi | 86% | 2667 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 53,403 psi | 86% | 2602 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,230 psi | 87% | 2625 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,027 psi | 87% | 2579 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 54,679 psi | 88% | 2628 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,983 psi | 87% | 2635 fps | 99% |
| Lovex S070 | <<locked>> | 98% | 54,694 psi | 88% | 2664 fps | 98.3% |
| Norma 201 | <<locked>> | 86% | 53,214 psi | 85% | 2595 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,664 psi | 86% | 2595 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,143 psi | 88% | 2677 fps | 100% |
| Norma 204 | <<locked>> | 98% | 53,243 psi | 85% | 2677 fps | 96.1% |
| Norma URPᴾ | <<locked>> | 100% | 56,260 psi | 90% | 2740 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 90% | 55,738 psi | 89% | 2703 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,810 psi | 88% | 2733 fps | 98.9% |
| Ramshot TAC | <<locked>> | 84% | 53,592 psi | 86% | 2621 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 84% | 53,113 psi | 85% | 2635 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,172 psi | 87% | 2602 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,158 psi | 58% | 1637 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,434 psi | 90% | 2628 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,795 psi | 86% | 2631 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 52,866 psi | 85% | 2700 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,999 psi | 90% | 2785 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 53,040 psi | 85% | 2720 fps | 99.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 56,434 psi | 90% | 2799 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 84% | 54,389 psi | 87% | 2579 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,766 psi | 86% | 2595 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,796 psi | 89% | 2674 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,130 psi | 90% | 2657 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,983 psi | 87% | 2635 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,230 psi | 87% | 2625 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,679 psi | 88% | 2628 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,694 psi | 88% | 2664 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 53,969 psi | 87% | 2687 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,550 psi | 89% | 2648 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,289 psi | 90% | 2671 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,781 psi | 88% | 2536 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,998 psi | 88% | 2539 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,085 psi | 87% | 2589 fps | 98% |
| Somchem S321 | <<locked>> | 82% | 54,549 psi | 87% | 2631 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,056 psi | 87% | 2536 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,100 psi | 88% | 2638 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 56,043 psi | 90% | 2674 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,415 psi | 81% | 2687 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 46,920 psi | 75% | 2575 fps | 96.1% |
| Vihtavuori N130 | <<locked>> | 82% | 54,462 psi | 87% | 2500 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,998 psi | 88% | 2523 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 53,505 psi | 86% | 2562 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,244 psi | 87% | 2579 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,056 psi | 87% | 2605 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,085 psi | 88% | 2684 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 84% | 53,766 psi | 86% | 2598 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,680 psi | 89% | 2618 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,143 psi | 87% | 2690 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,975 psi | 69% | 2582 fps | 99% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,434 psi | 89% | 2664 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 53,780 psi | 86% | 2644 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 53,113 psi | 85% | 2700 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,027 psi | 56% | 2510 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,173 psi | 90% | 2677 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% | 48,921 psi | 78% | 2464 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,698 psi | 67% | 2398 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,805 psi | 78% | 2543 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 46,644 psi | 75% | 2474 fps | 95.7% |
| Accurate 3100 | <<locked>> | 98% | 38,116 psi | 61% | 2425 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 39,421 psi | 63% | 2395 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,054 psi | 53% | 2333 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 45,136 psi | 72% | 2500 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 38,392 psi | 62% | 2362 fps | 97.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,195 psi | 76% | 2507 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 47,587 psi | 76% | 2490 fps | 100% |
| Alliant Power Pro 2000-MR | 58 gr | 80% | 41,133 psi | 66% | 2536 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,058 psi | 61% | 2385 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,843 psi | 65% | 2444 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,460 psi | 54% | 2343 fps | 95.8% |
| Alliant Reloder-17 | 57.1 gr | 80% | 32,866 psi | 53% | 2359 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,979 psi | 46% | 2257 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,433 psi | 57% | 2477 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,208 psi | 71% | 2507 fps | 98.7% |
| Bofors RP3 | <<locked>> | 80% | 37,710 psi | 60% | 2388 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 43,743 psi | 70% | 2457 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,965 psi | 79% | 2493 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,166 psi | 74% | 2533 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,894 psi | 82% | 2667 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 80% | 38,522 psi | 62% | 2392 fps | 96.8% |
| Hodgdon H414 | <<locked>> | 88% | 40,625 psi | 65% | 2484 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 90% | 47,384 psi | 76% | 2559 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 45,527 psi | 73% | 2513 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,790 psi | 46% | 2201 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,495 psi | 67% | 2487 fps | 99.6% |
| Hodgdon Superformance | 67.9 gr | 90% | 43,236 psi | 69% | 2556 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 42% | 1424 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,642 psi | 70% | 2464 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 45,397 psi | 73% | 2503 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,321 psi | 65% | 2395 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,685 psi | 68% | 2411 fps | 95.5% |
| IMR 4350 | <<locked>> | 92% | 43,816 psi | 70% | 2484 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 86% | 42,815 psi | 69% | 2444 fps | 95.5% |
| IMR 4831 | <<locked>> | 84% | 32,227 psi | 52% | 2297 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 41,814 psi | 67% | 2470 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 80% | 47,195 psi | 76% | 2507 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,411 psi | 71% | 2484 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,049 psi | 72% | 2441 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 40,219 psi | 64% | 2398 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 37,463 psi | 60% | 2346 fps | 95.5% |
| Lovex S070 | <<locked>> | 88% | 40,205 psi | 64% | 2421 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 44,208 psi | 71% | 2457 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 44,498 psi | 71% | 2461 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,190 psi | 64% | 2434 fps | 98.8% |
| Norma 204 | <<locked>> | 96% | 49,806 psi | 80% | 2621 fps | 95.3% |
| Norma URP | <<locked>> | 84% | 33,489 psi | 54% | 2336 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 39,798 psi | 64% | 2448 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 90% | 39,726 psi | 64% | 2474 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 47,123 psi | 76% | 2516 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,557 psi | 75% | 2533 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,894 psi | 82% | 2556 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,890 psi | 43% | 1463 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,895 psi | 85% | 2579 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,943 psi | 62% | 2375 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,076 psi | 69% | 2543 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,983 psi | 56% | 2421 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 32,938 psi | 53% | 2349 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 35,317 psi | 57% | 2405 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 48,312 psi | 77% | 2490 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,221 psi | 68% | 2415 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 35,462 psi | 57% | 2336 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 43,743 psi | 70% | 2457 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,463 psi | 60% | 2346 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,411 psi | 71% | 2484 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,219 psi | 64% | 2398 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 40,205 psi | 64% | 2421 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,434 psi | 58% | 2385 fps | 97.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,484 psi | 73% | 2493 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,627 psi | 70% | 2474 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,440 psi | 73% | 2408 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,869 psi | 61% | 2287 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,829 psi | 67% | 2392 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 50,923 psi | 82% | 2579 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,121 psi | 72% | 2411 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,049 psi | 72% | 2487 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 36,318 psi | 58% | 2343 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 26,397 psi | 42% | 2188 fps | 96.1% |
| Somchem S385 | <<locked>> | 98% | 44,106 psi | 71% | 2526 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 51,271 psi | 82% | 2457 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,803 psi | 73% | 2398 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,568 psi | 67% | 2392 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,134 psi | 68% | 2402 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,534 psi | 55% | 2283 fps | 99% |
| Vihtavuori N160 | <<locked>> | 82% | 32,837 psi | 53% | 2287 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 47,340 psi | 76% | 2503 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,654 psi | 65% | 2395 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,490 psi | 55% | 2339 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 90% | 30,995 psi | 50% | 2329 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,516 psi | 49% | 2215 fps | 96.6% |
| Winchester 748 | <<locked>> | 80% | 46,876 psi | 75% | 2546 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 40,785 psi | 65% | 2487 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,950 psi | 46% | 2329 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,149 psi | 69% | 2480 fps | 99.5% |
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 TBBC. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,799 fps; across all powders the maximum-charge window runs from 1,598 fps to 2,799 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 56–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:15.0 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 Power Pro 2000-MR, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .338 Win Mag. with the .338 | 225gr | Speer TBBC 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.