Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 210gr | Barnes X BT bullet and 82 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country and Norma MRP.
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 3100 | <<locked>> | 96% | 54,882 psi | 86% | 2792 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 56,347 psi | 88% | 2831 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 55,434 psi | 87% | 2923 fps | 98% |
| Accurate MAGPRO | <<locked>> | 96% | 56,420 psi | 88% | 2920 fps | 97% |
| ADI AR 2208 | <<locked>> | 84% | 57,246 psi | 90% | 2792 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,362 psi | 88% | 2867 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 96% | 54,172 psi | 85% | 2864 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,944 psi | 64% | 2664 fps | 97.5% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 56,565 psi | 89% | 2864 fps | 98.8% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 56,565 psi | 89% | 2864 fps | 98.8% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 56,565 psi | 89% | 2864 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,477 psi | 87% | 2772 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,057 psi | 88% | 2877 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,566 psi | 90% | 2897 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,854 psi | 88% | 2854 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,479 psi | 90% | 2920 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,723 psi | 86% | 2848 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,676 psi | 79% | 2841 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,114 psi | 86% | 2936 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,521 psi | 89% | 2904 fps | 98.9% |
| Bofors RP3 | <<locked>> | 82% | 56,869 psi | 89% | 2795 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,905 psi | 74% | 2776 fps | 96.6% |
| Bofors RP5 | <<locked>> | 98% | 57,479 psi | 90% | 2920 fps | 99.1% |
| Bofors RP7 | <<locked>> | 86% | 55,463 psi | 87% | 2776 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,082 psi | 78% | 2782 fps | 97.4% |
| Hodgdon H380 | <<locked>> | 82% | 56,695 psi | 89% | 2805 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,609 psi | 90% | 2874 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 86% | 56,811 psi | 89% | 2831 fps | 99% |
| Hodgdon H4831 | <<locked>> | 94% | 54,201 psi | 85% | 2808 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,753 psi | 89% | 2844 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,782 psi | 89% | 2802 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,705 psi | 78% | 2890 fps | 98.7% |
| Hodgdon Superformance | <<locked>> | 86% | 53,969 psi | 85% | 2851 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,072 psi | 58% | 1778 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,884 psi | 89% | 2779 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,449 psi | 88% | 2805 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,521 psi | 89% | 2795 fps | 99.5% |
| IMR 4831 | <<locked>> | 90% | 56,434 psi | 88% | 2822 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,651 psi | 87% | 2795 fps | 97.2% |
| IMR 7828 SSC | <<locked>> | 98% | 55,405 psi | 87% | 2894 fps | 97.8% |
| Lovex S062 | <<locked>> | 82% | 57,740 psi | 90% | 2776 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,493 psi | 90% | 2799 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,680 psi | 87% | 2795 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,446 psi | 82% | 2756 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 57,377 psi | 90% | 2858 fps | 98.7% |
| Norma MRP | <<locked>> | 96% | 57,348 psi | 90% | 2946 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 54,549 psi | 85% | 2815 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,057 psi | 88% | 2910 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 56,724 psi | 89% | 2864 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,346 psi | 85% | 2851 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,913 psi | 59% | 1821 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,057 psi | 88% | 2785 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 56,869 psi | 89% | 2887 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,941 psi | 88% | 2851 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,566 psi | 90% | 2923 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,314 psi | 79% | 2887 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 84% | 56,913 psi | 89% | 2789 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,476 psi | 85% | 2785 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 94% | 55,477 psi | 87% | 2848 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 86% | 55,463 psi | 87% | 2776 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,493 psi | 90% | 2799 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,740 psi | 90% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,680 psi | 87% | 2795 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,360 psi | 85% | 2792 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,695 psi | 89% | 2664 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,927 psi | 89% | 2753 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,998 psi | 86% | 2841 fps | 98.7% |
| Somchem S355 | <<locked>> | 84% | 56,507 psi | 89% | 2782 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,130 psi | 88% | 2776 fps | 97.1% |
| Somchem S365 | <<locked>> | 90% | 54,404 psi | 85% | 2818 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,463 psi | 88% | 2825 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 86% | 57,566 psi | 90% | 2753 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,202 psi | 88% | 2802 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,405 psi | 87% | 2795 fps | 99% |
| Vihtavuori N550 | <<locked>> | 88% | 55,753 psi | 87% | 2812 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 57,566 psi | 90% | 2881 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,261 psi | 90% | 2936 fps | 97.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 53,563 psi | 84% | 2858 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,695 psi | 87% | 2762 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,317 psi | 85% | 2825 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 54,810 psi | 86% | 2976 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,028 psi | 88% | 2812 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 3100 | <<locked>> | 80% | 33,243 psi | 52% | 2392 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 43,700 psi | 68% | 2631 fps | 99.5% |
| Accurate High Country | 82.5 gr | 88% | 45,440 psi | 71% | 2749 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 92% | 49,298 psi | 77% | 2805 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 50,981 psi | 80% | 2700 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 41,060 psi | 64% | 2598 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 92% | 47,543 psi | 75% | 2749 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 96% | 36,376 psi | 57% | 2556 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 41,553 psi | 65% | 2602 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 41,553 psi | 65% | 2602 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 41,553 psi | 65% | 2602 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,199 psi | 82% | 2726 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,205 psi | 65% | 2628 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,036 psi | 74% | 2743 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 41,118 psi | 64% | 2598 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 86% | 39,262 psi | 62% | 2598 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,415 psi | 49% | 2415 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,270 psi | 49% | 2421 fps | 95.2% |
| Alliant Reloder-26 | 77.3 gr | 80% | 33,939 psi | 53% | 2533 fps | 97.4% |
| Bofors RP15 | <<locked>> | 90% | 41,408 psi | 65% | 2641 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 53,287 psi | 84% | 2743 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 44,034 psi | 69% | 2720 fps | 95.8% |
| Bofors RP5 | <<locked>> | 86% | 39,262 psi | 62% | 2598 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 46,340 psi | 73% | 2625 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 96% | 44,077 psi | 69% | 2667 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 53,156 psi | 83% | 2756 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,643 psi | 70% | 2661 fps | 98% |
| Hodgdon H4350 | <<locked>> | 80% | 47,108 psi | 74% | 2674 fps | 97.3% |
| Hodgdon H4831 | <<locked>> | 90% | 47,732 psi | 75% | 2700 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 92% | 49,792 psi | 78% | 2736 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,088 psi | 61% | 2523 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 38,914 psi | 61% | 2654 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 43,787 psi | 69% | 2677 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,789 psi | 44% | 1591 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,650 psi | 84% | 2733 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,814 psi | 66% | 2556 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,340 psi | 74% | 2648 fps | 98.4% |
| IMR 4831 | <<locked>> | 80% | 41,495 psi | 65% | 2575 fps | 99.3% |
| IMR 4955 Enduron | <<locked>> | 88% | 46,398 psi | 73% | 2641 fps | 95% |
| IMR 7828 SSC | <<locked>> | 92% | 45,759 psi | 72% | 2726 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 54,360 psi | 85% | 2730 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 45,498 psi | 71% | 2608 fps | 99% |
| Lovex S070 | <<locked>> | 80% | 43,859 psi | 69% | 2595 fps | 98% |
| Lovex S071 | <<locked>> | 84% | 32,634 psi | 51% | 2379 fps | 95.4% |
| Norma 204 | <<locked>> | 80% | 41,452 psi | 65% | 2585 fps | 95.3% |
| Norma MRP | 76.9 gr | 82% | 36,129 psi | 57% | 2552 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 42,525 psi | 67% | 2615 fps | 99.4% |
| Ramshot Grand | <<locked>> | 92% | 45,629 psi | 72% | 2733 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 41,249 psi | 65% | 2602 fps | 98% |
| Ramshot Magnum | <<locked>> | 90% | 38,479 psi | 60% | 2562 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,471 psi | 45% | 1631 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,837 psi | 83% | 2736 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,705 psi | 78% | 2785 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,062 psi | 67% | 2641 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,162 psi | 65% | 2648 fps | 99% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 36,071 psi | 57% | 2579 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 50,401 psi | 79% | 2697 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 45,397 psi | 71% | 2631 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 84% | 40,495 psi | 63% | 2582 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 46,340 psi | 73% | 2625 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,498 psi | 71% | 2608 fps | 99% |
| Shooters World Precision | <<locked>> | 80% | 54,360 psi | 85% | 2730 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,859 psi | 69% | 2595 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,966 psi | 80% | 2740 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,343 psi | 79% | 2582 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,570 psi | 70% | 2552 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 40,132 psi | 63% | 2579 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 50,125 psi | 79% | 2690 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 49,501 psi | 78% | 2671 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 39,378 psi | 62% | 2579 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,477 psi | 57% | 2467 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 47,950 psi | 75% | 2618 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,903 psi | 69% | 2608 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 86% | 38,145 psi | 60% | 2497 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 43,424 psi | 68% | 2612 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 35,186 psi | 55% | 2490 fps | 98.5% |
| Vihtavuori N560 | <<locked>> | 90% | 47,065 psi | 74% | 2762 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 96% | 46,992 psi | 74% | 2746 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,714 psi | 67% | 2569 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,788 psi | 70% | 2664 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 80% | 28,268 psi | 44% | 2418 fps | 98.4% |
| Winchester Supreme 780 | <<locked>> | 86% | 40,263 psi | 63% | 2546 fps | 95.2% |
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 82 powders for .338 Rem. Ultra Mag. loaded with the .338 | 210gr | Barnes X BT. Winchester StaBALL HD delivers the highest muzzle velocity at 2,976 fps; across all powders the maximum-charge window runs from 1,778 fps to 2,976 fps. ADI AR 2225 gives the best case fill at 100 %, and 82 of the 82 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 210.0 gr projectile in 0.338" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-25, Bofors RP15 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-26, Accurate High Country, Norma MRP rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 210gr | Barnes X BT 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.