Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 210gr | Fox Classic 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 ReloadSwiss RS 70, Alliant Reloder-26 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 2495 | <<locked>> | 82% | 54,462 psi | 85% | 2687 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,318 psi | 88% | 2759 fps | 99% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,346 psi | 85% | 2795 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 55,013 psi | 86% | 2740 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,420 psi | 88% | 2851 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 57,043 psi | 89% | 2940 fps | 96.9% |
| ADI AR 2208 | <<locked>> | 86% | 55,724 psi | 87% | 2782 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 53,896 psi | 84% | 2838 fps | 98.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,317 psi | 87% | 2887 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,984 psi | 86% | 2894 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,085 psi | 85% | 2835 fps | 98.3% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,085 psi | 85% | 2835 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,304 psi | 88% | 2799 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,565 psi | 89% | 2822 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 57,305 psi | 90% | 2907 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,056 psi | 86% | 2877 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 57,101 psi | 89% | 2884 fps | 98.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,244 psi | 85% | 2881 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,213 psi | 80% | 2815 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,396 psi | 70% | 2743 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,361 psi | 87% | 2953 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,574 psi | 78% | 2805 fps | 97.6% |
| Bofors RP3 | <<locked>> | 86% | 57,290 psi | 90% | 2815 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,244 psi | 85% | 2881 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 56,652 psi | 89% | 2805 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 86% | 57,740 psi | 90% | 2835 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 55,056 psi | 86% | 2848 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 88% | 54,665 psi | 86% | 2808 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 98% | 55,477 psi | 87% | 2831 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 98% | 54,375 psi | 85% | 2815 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,012 psi | 85% | 2779 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,448 psi | 87% | 2815 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,526 psi | 68% | 2772 fps | 96.9% |
| Hodgdon Superformance | <<locked>> | 90% | 55,535 psi | 87% | 2884 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,158 psi | 57% | 1759 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,927 psi | 88% | 2782 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,071 psi | 86% | 2762 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,667 psi | 90% | 2795 fps | 99.6% |
| IMR 4350 | <<locked>> | 92% | 54,360 psi | 85% | 2785 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,926 psi | 86% | 2779 fps | 99.3% |
| IMR 4831 | <<locked>> | 94% | 56,869 psi | 89% | 2838 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,476 psi | 85% | 2799 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 57,087 psi | 89% | 2825 fps | 97.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 52,794 psi | 83% | 2858 fps | 97% |
| Lovex S060 | <<locked>> | 82% | 56,463 psi | 88% | 2746 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,027 psi | 86% | 2753 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,766 psi | 86% | 2772 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 56,159 psi | 88% | 2812 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,788 psi | 70% | 2651 fps | 98.7% |
| Norma 201 | <<locked>> | 82% | 56,289 psi | 88% | 2762 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,159 psi | 90% | 2759 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,811 psi | 87% | 2808 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,085 psi | 86% | 2831 fps | 98.3% |
| Norma MRP | <<locked>> | 98% | 54,027 psi | 85% | 2910 fps | 99.4% |
| Norma URP | <<locked>> | 92% | 55,114 psi | 86% | 2835 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,942 psi | 89% | 2831 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,098 psi | 83% | 2871 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 92% | 53,998 psi | 85% | 2835 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,340 psi | 74% | 2749 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,840 psi | 58% | 1801 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,070 psi | 85% | 2766 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,317 psi | 85% | 2867 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 56,637 psi | 89% | 2871 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,245 psi | 87% | 2900 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,468 psi | 68% | 2762 fps | 98% |
| Rottweil R 902 | <<locked>> | 84% | 57,043 psi | 89% | 2766 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,363 psi | 90% | 2808 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,651 psi | 87% | 2812 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 98% | 56,202 psi | 88% | 2867 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 90% | 56,652 psi | 89% | 2805 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,766 psi | 86% | 2772 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 55,027 psi | 86% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,159 psi | 88% | 2812 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,477 psi | 87% | 2818 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,347 psi | 88% | 2795 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,217 psi | 90% | 2697 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,868 psi | 86% | 2654 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,549 psi | 85% | 2726 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,709 psi | 87% | 2864 fps | 98.7% |
| Somchem S335 | <<locked>> | 82% | 56,797 psi | 89% | 2690 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,116 psi | 90% | 2805 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 57,725 psi | 90% | 2805 fps | 97.2% |
| Somchem S365 | <<locked>> | 94% | 54,563 psi | 86% | 2835 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,869 psi | 89% | 2841 fps | 99.3% |
| Vihtavuori N135 | <<locked>> | 84% | 57,421 psi | 90% | 2720 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,331 psi | 85% | 2694 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,158 psi | 86% | 2733 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 57,363 psi | 90% | 2828 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,547 psi | 82% | 2762 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 84% | 56,014 psi | 88% | 2736 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 56,521 psi | 89% | 2835 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 57,232 psi | 90% | 2890 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,317 psi | 85% | 2897 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 57,319 psi | 90% | 2792 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,259 psi | 87% | 2851 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,296 psi | 73% | 2871 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,681 psi | 89% | 2802 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 57,377 psi | 90% | 2841 fps | 98.7% |
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 2495 | <<locked>> | 80% | 50,995 psi | 80% | 2641 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,342 psi | 77% | 2654 fps | 98% |
| Accurate 3100 | <<locked>> | 86% | 33,199 psi | 52% | 2418 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 48,327 psi | 76% | 2648 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,796 psi | 58% | 2516 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 96% | 49,269 psi | 77% | 2815 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 46,093 psi | 72% | 2631 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 41,292 psi | 65% | 2615 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 96% | 48,240 psi | 76% | 2769 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,242 psi | 80% | 2838 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,365 psi | 65% | 2615 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,365 psi | 65% | 2615 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,485 psi | 73% | 2654 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,632 psi | 78% | 2720 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,114 psi | 57% | 2533 fps | 98.4% |
| Alliant Reloder-17 | 73.3 gr | 80% | 41,060 psi | 64% | 2654 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 40,915 psi | 64% | 2605 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,220 psi | 65% | 2654 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,208 psi | 41% | 2287 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 90% | 31,923 psi | 50% | 2457 fps | 95.3% |
| Alliant Reloder-26 | 77 gr | 82% | 30,081 psi | 47% | 2448 fps | 95.4% |
| Bofors RP15 | <<locked>> | 94% | 40,654 psi | 64% | 2641 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 46,702 psi | 73% | 2661 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 41,220 psi | 65% | 2654 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 41,017 psi | 64% | 2539 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 80% | 47,065 psi | 74% | 2674 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 38,986 psi | 61% | 2566 fps | 96.4% |
| Hodgdon H4350 | <<locked>> | 80% | 42,061 psi | 66% | 2589 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 94% | 48,370 psi | 76% | 2720 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 50,676 psi | 79% | 2759 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,489 psi | 52% | 2428 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,605 psi | 81% | 2762 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 40,640 psi | 64% | 2707 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 38,072 psi | 60% | 2572 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,064 psi | 42% | 1578 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,489 psi | 82% | 2733 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,457 psi | 76% | 2664 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,734 psi | 80% | 2694 fps | 98.8% |
| IMR 4350 | <<locked>> | 82% | 39,320 psi | 62% | 2520 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,641 psi | 67% | 2572 fps | 97.2% |
| IMR 4831 | <<locked>> | 80% | 35,563 psi | 56% | 2477 fps | 98% |
| IMR 4895 | <<locked>> | 80% | 50,923 psi | 80% | 2746 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 47,108 psi | 74% | 2664 fps | 95% |
| IMR 7828 SSC | <<locked>> | 96% | 46,035 psi | 72% | 2743 fps | 95.3% |
| Lovex S060 | <<locked>> | 80% | 53,055 psi | 83% | 2700 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,457 psi | 76% | 2657 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,958 psi | 63% | 2520 fps | 97.8% |
| Lovex S070 | <<locked>> | 80% | 38,218 psi | 60% | 2500 fps | 96.3% |
| Lovex S071 | <<locked>> | 90% | 32,126 psi | 50% | 2392 fps | 95% |
| Norma 201 | <<locked>> | 80% | 52,808 psi | 83% | 2717 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,664 psi | 84% | 2713 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,994 psi | 77% | 2707 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,684 psi | 65% | 2602 fps | 95.2% |
| Norma MRP | <<locked>> | 88% | 37,710 psi | 59% | 2605 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 36,883 psi | 58% | 2516 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 80% | 49,574 psi | 78% | 2726 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 45,818 psi | 72% | 2746 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 35,737 psi | 56% | 2500 fps | 96.2% |
| Ramshot Magnum | <<locked>> | 94% | 37,811 psi | 59% | 2562 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,441 psi | 43% | 1614 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,181 psi | 74% | 2657 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,685 psi | 68% | 2703 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,825 psi | 58% | 2536 fps | 98% |
| ReloadSwiss RS 70 | 74.5 gr | 80% | 35,839 psi | 56% | 2543 fps | 97.4% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,637 psi | 59% | 2628 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 50,212 psi | 79% | 2671 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,918 psi | 69% | 2608 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,658 psi | 72% | 2648 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 88% | 39,885 psi | 63% | 2585 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 41,017 psi | 64% | 2539 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,958 psi | 63% | 2520 fps | 97.8% |
| Shooters World Precision | <<locked>> | 80% | 48,457 psi | 76% | 2657 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,218 psi | 60% | 2500 fps | 96.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,281 psi | 71% | 2664 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,779 psi | 83% | 2743 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,621 psi | 84% | 2651 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,310 psi | 71% | 2523 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,146 psi | 61% | 2464 fps | 96.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,424 psi | 66% | 2641 fps | 95.9% |
| Somchem S335 | <<locked>> | 80% | 53,403 psi | 84% | 2648 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,237 psi | 69% | 2612 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 50,372 psi | 79% | 2694 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 33,170 psi | 52% | 2470 fps | 99.6% |
| Somchem S385 | <<locked>> | 86% | 37,898 psi | 59% | 2516 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 50,531 psi | 79% | 2635 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,966 psi | 80% | 2648 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,337 psi | 66% | 2543 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,218 psi | 60% | 2516 fps | 98.4% |
| Vihtavuori N165 | <<locked>> | 92% | 39,987 psi | 63% | 2549 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 49,124 psi | 77% | 2641 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,637 psi | 59% | 2516 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 80% | 28,848 psi | 45% | 2359 fps | 96.1% |
| Vihtavuori N560 | <<locked>> | 94% | 47,094 psi | 74% | 2776 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,463 psi | 59% | 2484 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 39,146 psi | 61% | 2569 fps | 96.4% |
| Winchester StaBALL HD | <<locked>> | 82% | 24,642 psi | 39% | 2306 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,852 psi | 83% | 2749 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 42,917 psi | 67% | 2612 fps | 95.8% |
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 Rem. Ultra Mag. loaded with the .338 | 210gr | Fox Classic Hunter. Alliant Reloder-26 delivers the highest muzzle velocity at 2,953 fps; across all powders the maximum-charge window runs from 1,759 fps to 2,953 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 (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 210.0 gr projectile in 0.338" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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. ReloadSwiss RS 70, Alliant Reloder-26, Alliant Reloder-17 rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 210gr | Fox Classic 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.