Load Specifications
Load data in caliber .338 Win Mag. with .338 | 210gr | Impala RNFP KO bullet and 96 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, ReloadSwiss RS 60 and Hodgdon Superformance.
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>> | 82% | 53,809 psi | 86% | 2605 fps | 100% |
| Accurate 2495 | <<locked>> | 84% | 54,128 psi | 87% | 2677 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,535 psi | 89% | 2720 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,143 psi | 88% | 2664 fps | 96.6% |
| Accurate 4064 | <<locked>> | 90% | 54,824 psi | 88% | 2710 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,548 psi | 86% | 2779 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 86% | 54,563 psi | 87% | 2733 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 55,100 psi | 88% | 2726 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,447 psi | 86% | 2684 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,172 psi | 87% | 2661 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 53,577 psi | 86% | 2838 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,419 psi | 89% | 2753 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,898 psi | 90% | 2772 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,447 psi | 87% | 2828 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,767 psi | 89% | 2867 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,581 psi | 63% | 2582 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,903 psi | 70% | 2730 fps | 97.6% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,041 psi | 87% | 2743 fps | 99.5% |
| Bofors RP3 | <<locked>> | 92% | 56,231 psi | 90% | 2772 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,999 psi | 90% | 2733 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,129 psi | 88% | 2667 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,041 psi | 87% | 2726 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,347 psi | 89% | 2812 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 53,447 psi | 86% | 2667 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 53,650 psi | 86% | 2730 fps | 99% |
| Hodgdon H414 | <<locked>> | 94% | 54,114 psi | 87% | 2795 fps | 97.5% |
| Hodgdon H4350 | <<locked>> | 98% | 55,970 psi | 90% | 2766 fps | 96.4% |
| Hodgdon H4895 | <<locked>> | 86% | 55,071 psi | 88% | 2740 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,908 psi | 82% | 2713 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,056 psi | 88% | 2779 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,011 psi | 85% | 2799 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,810 psi | 57% | 1660 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,825 psi | 90% | 2733 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 53,505 psi | 86% | 2703 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,099 psi | 87% | 2700 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 92% | 53,563 psi | 86% | 2671 fps | 97.2% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,854 psi | 90% | 2753 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,317 psi | 89% | 2723 fps | 97.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,182 psi | 77% | 2680 fps | 98.8% |
| IMR 4895 | <<locked>> | 88% | 53,867 psi | 86% | 2749 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 84% | 53,447 psi | 86% | 2684 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,476 psi | 87% | 2713 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,085 psi | 87% | 2661 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 54,810 psi | 88% | 2710 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,041 psi | 87% | 2710 fps | 98.5% |
| Lovex S070 | <<locked>> | 98% | 54,810 psi | 88% | 2743 fps | 97.7% |
| Norma 201 | <<locked>> | 86% | 53,722 psi | 86% | 2684 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,809 psi | 86% | 2684 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,085 psi | 88% | 2759 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 55,956 psi | 90% | 2818 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 90% | 55,564 psi | 89% | 2785 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,447 psi | 87% | 2808 fps | 98.3% |
| Ramshot TAC | <<locked>> | 84% | 53,548 psi | 86% | 2697 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 53,026 psi | 85% | 2717 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,186 psi | 87% | 2684 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,245 psi | 58% | 1696 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,188 psi | 90% | 2710 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,722 psi | 86% | 2707 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,202 psi | 90% | 2835 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,419 psi | 89% | 2864 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 52,721 psi | 85% | 2795 fps | 99.1% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 56,188 psi | 90% | 2877 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 84% | 55,056 psi | 88% | 2667 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,172 psi | 87% | 2680 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,115 psi | 90% | 2762 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 55,999 psi | 90% | 2733 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,041 psi | 87% | 2710 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,476 psi | 87% | 2713 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,810 psi | 88% | 2710 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,028 psi | 90% | 2756 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 53,896 psi | 86% | 2766 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,782 psi | 89% | 2730 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,072 psi | 90% | 2749 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,984 psi | 88% | 2621 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,926 psi | 88% | 2621 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,288 psi | 87% | 2664 fps | 97.3% |
| Somchem S321 | <<locked>> | 82% | 54,621 psi | 88% | 2713 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,404 psi | 87% | 2621 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,100 psi | 88% | 2720 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 56,246 psi | 90% | 2759 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,212 psi | 81% | 2769 fps | 100% |
| Unknown powder | <<locked>> | 96% | 53,359 psi | 86% | 2769 fps | 98.9% |
| Vihtavuori N130 | <<locked>> | 82% | 53,534 psi | 86% | 2572 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,375 psi | 87% | 2602 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,897 psi | 88% | 2657 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 53,563 psi | 86% | 2654 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 53,940 psi | 86% | 2690 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 53,969 psi | 87% | 2743 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 82% | 53,026 psi | 85% | 2687 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 53,171 psi | 85% | 2680 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 54,389 psi | 87% | 2792 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,221 psi | 69% | 2661 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,259 psi | 89% | 2743 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,114 psi | 87% | 2736 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,114 psi | 87% | 2795 fps | 97.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,534 psi | 57% | 2582 fps | 98.3% |
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% | 50,618 psi | 81% | 2559 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 47,805 psi | 77% | 2585 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,849 psi | 78% | 2625 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 48,979 psi | 79% | 2566 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 40,582 psi | 65% | 2487 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,910 psi | 54% | 2415 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 45,382 psi | 73% | 2582 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 80% | 38,711 psi | 62% | 2438 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,282 psi | 76% | 2585 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 47,703 psi | 76% | 2575 fps | 100% |
| Alliant Power Pro 2000-MR | 58.6 gr | 80% | 41,162 psi | 66% | 2608 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,537 psi | 62% | 2464 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,234 psi | 66% | 2523 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 86% | 35,998 psi | 58% | 2470 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,315 psi | 53% | 2431 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,401 psi | 50% | 2382 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 38,392 psi | 62% | 2612 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,367 psi | 71% | 2582 fps | 98.2% |
| Bofors RP3 | <<locked>> | 80% | 38,421 psi | 62% | 2470 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 46,978 psi | 75% | 2585 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,037 psi | 79% | 2575 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,471 psi | 76% | 2625 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,779 psi | 83% | 2756 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 80% | 50,125 psi | 80% | 2621 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,073 psi | 63% | 2470 fps | 96.2% |
| Hodgdon H414 | <<locked>> | 88% | 44,396 psi | 71% | 2628 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 94% | 49,719 psi | 80% | 2667 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 45,832 psi | 73% | 2592 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,602 psi | 47% | 2277 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,786 psi | 69% | 2582 fps | 99.4% |
| Hodgdon Superformance | 70.2 gr | 92% | 46,383 psi | 74% | 2684 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,672 psi | 43% | 1480 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,626 psi | 67% | 2497 fps | 98.9% |
| IMR 3031 | <<locked>> | 80% | 41,989 psi | 67% | 2530 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,145 psi | 61% | 2418 fps | 97.3% |
| IMR 4166 Enduron | <<locked>> | 86% | 45,208 psi | 72% | 2526 fps | 95.4% |
| IMR 4350 | <<locked>> | 94% | 46,644 psi | 75% | 2605 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 46,470 psi | 75% | 2575 fps | 95.6% |
| IMR 4831 | <<locked>> | 88% | 33,678 psi | 54% | 2395 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 42,192 psi | 68% | 2549 fps | 98.7% |
| IMR 8208 XBR | <<locked>> | 80% | 47,282 psi | 76% | 2585 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 44,846 psi | 72% | 2566 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,223 psi | 73% | 2516 fps | 99.1% |
| Lovex S062 | <<locked>> | 80% | 40,814 psi | 65% | 2477 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 40,408 psi | 65% | 2474 fps | 95.6% |
| Lovex S070 | <<locked>> | 90% | 43,149 psi | 69% | 2546 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 44,788 psi | 72% | 2539 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 44,860 psi | 72% | 2546 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,640 psi | 65% | 2510 fps | 98.3% |
| Norma URP | <<locked>> | 86% | 36,143 psi | 58% | 2461 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 39,900 psi | 64% | 2520 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 42,612 psi | 68% | 2602 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 47,137 psi | 76% | 2592 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,760 psi | 75% | 2612 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,865 psi | 82% | 2631 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,166 psi | 44% | 1516 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,823 psi | 85% | 2664 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,930 psi | 67% | 2503 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,047 psi | 69% | 2618 fps | 98.4% |
| ReloadSwiss RS 60 | 57.7 gr | 80% | 35,317 psi | 57% | 2493 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 35,694 psi | 57% | 2477 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 38,087 psi | 61% | 2533 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 49,197 psi | 79% | 2579 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,946 psi | 69% | 2497 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 36,274 psi | 58% | 2418 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 46,978 psi | 75% | 2585 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,408 psi | 65% | 2474 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,846 psi | 72% | 2566 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,814 psi | 65% | 2477 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 44,266 psi | 71% | 2559 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,724 psi | 59% | 2457 fps | 97.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,745 psi | 73% | 2569 fps | 97.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,787 psi | 70% | 2552 fps | 98.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,788 psi | 73% | 2487 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,290 psi | 61% | 2362 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 45,049 psi | 72% | 2516 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 51,169 psi | 82% | 2664 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,600 psi | 73% | 2493 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,252 psi | 73% | 2566 fps | 99% |
| Somchem S355 | <<locked>> | 80% | 36,941 psi | 59% | 2421 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 27,238 psi | 44% | 2267 fps | 95.5% |
| Unknown powder | <<locked>> | 84% | 36,854 psi | 59% | 2464 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 50,749 psi | 81% | 2533 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,352 psi | 70% | 2441 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,207 psi | 69% | 2487 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,047 psi | 67% | 2477 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,734 psi | 51% | 2287 fps | 97.7% |
| Vihtavuori N160 | <<locked>> | 82% | 34,679 psi | 56% | 2392 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 49,777 psi | 80% | 2638 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,582 psi | 67% | 2493 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,041 psi | 56% | 2431 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 92% | 33,794 psi | 54% | 2461 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,140 psi | 50% | 2287 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 50,604 psi | 81% | 2684 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 44,396 psi | 71% | 2628 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 96% | 31,604 psi | 51% | 2464 fps | 96.3% |
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 96 powders for .338 Win Mag. loaded with the .338 | 210gr | Impala RNFP KO. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,877 fps; across all powders the maximum-charge window runs from 1,660 fps to 2,877 fps. Alliant Reloder-16 gives the best case fill at 100 %, and 96 of the 96 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 210.0 gr projectile in 0.338" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-16, Alliant Reloder-23, Alliant Reloder-26 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, ReloadSwiss RS 60, Hodgdon Superformance rank at the top here: for .338 Win Mag. with the .338 | 210gr | Impala RNFP KO 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.