Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 210gr | Impala RNFP KO bullet and 78 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and Alliant Reloder-26.
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 3100 | <<locked>> | 96% | 55,724 psi | 87% | 2802 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 57,087 psi | 89% | 2844 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 56,202 psi | 88% | 2936 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 96% | 57,159 psi | 90% | 2933 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 82% | 54,534 psi | 85% | 2756 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,927 psi | 89% | 2881 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 96% | 54,882 psi | 86% | 2877 fps | 97.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,437 psi | 65% | 2680 fps | 97.8% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 57,305 psi | 90% | 2877 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,057 psi | 88% | 2785 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,782 psi | 89% | 2890 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,476 psi | 85% | 2858 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,623 psi | 89% | 2871 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,723 psi | 86% | 2881 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,564 psi | 87% | 2861 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,343 psi | 80% | 2858 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,927 psi | 88% | 2946 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,276 psi | 90% | 2917 fps | 99% |
| Bofors RP3 | <<locked>> | 82% | 57,363 psi | 90% | 2802 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,616 psi | 75% | 2789 fps | 96.9% |
| Bofors RP5 | <<locked>> | 96% | 54,723 psi | 86% | 2881 fps | 98.8% |
| Bofors RP7 | <<locked>> | 86% | 56,057 psi | 88% | 2789 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,691 psi | 79% | 2795 fps | 97.6% |
| Hodgdon H380 | <<locked>> | 82% | 57,188 psi | 90% | 2818 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,766 psi | 86% | 2835 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 86% | 57,377 psi | 90% | 2841 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 94% | 54,911 psi | 86% | 2822 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 96% | 57,508 psi | 90% | 2861 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 57,667 psi | 90% | 2815 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,328 psi | 79% | 2904 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 86% | 54,694 psi | 86% | 2864 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,043 psi | 58% | 1781 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,377 psi | 90% | 2785 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,014 psi | 89% | 2815 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,130 psi | 90% | 2808 fps | 99.6% |
| IMR 4831 | <<locked>> | 90% | 57,072 psi | 89% | 2831 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,144 psi | 88% | 2808 fps | 97.4% |
| IMR 7828 SSC | <<locked>> | 98% | 56,130 psi | 88% | 2907 fps | 98% |
| Lovex S065 | <<locked>> | 86% | 54,723 psi | 86% | 2762 fps | 99.9% |
| Lovex S070 | <<locked>> | 88% | 56,304 psi | 88% | 2805 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,214 psi | 83% | 2769 fps | 99.8% |
| Norma 204 | <<locked>> | 88% | 54,288 psi | 85% | 2815 fps | 98.4% |
| Norma MRP | <<locked>> | 94% | 54,317 psi | 85% | 2904 fps | 99.6% |
| Norma URP | <<locked>> | 88% | 55,158 psi | 86% | 2825 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,840 psi | 89% | 2927 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 90% | 57,319 psi | 90% | 2874 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,288 psi | 87% | 2867 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,884 psi | 59% | 1824 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,724 psi | 89% | 2799 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,638 psi | 90% | 2897 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,739 psi | 89% | 2864 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,636 psi | 86% | 2884 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,082 psi | 80% | 2907 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 57,638 psi | 90% | 2799 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,013 psi | 86% | 2799 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 94% | 56,057 psi | 88% | 2858 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 86% | 56,057 psi | 88% | 2789 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,723 psi | 86% | 2762 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 88% | 56,304 psi | 88% | 2805 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,853 psi | 86% | 2802 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,188 psi | 90% | 2674 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,537 psi | 90% | 2762 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,593 psi | 87% | 2854 fps | 98.8% |
| Somchem S355 | <<locked>> | 84% | 57,000 psi | 89% | 2789 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,782 psi | 89% | 2785 fps | 97.3% |
| Somchem S365 | <<locked>> | 90% | 55,114 psi | 86% | 2828 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,029 psi | 89% | 2838 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 84% | 54,737 psi | 86% | 2717 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,826 psi | 89% | 2812 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,130 psi | 88% | 2808 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 88% | 56,347 psi | 88% | 2822 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,940 psi | 86% | 2844 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,273 psi | 85% | 2890 fps | 97.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,259 psi | 85% | 2871 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,217 psi | 88% | 2772 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,766 psi | 86% | 2835 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,811 psi | 87% | 2989 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,753 psi | 89% | 2825 fps | 98.8% |
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% | 33,649 psi | 53% | 2405 fps | 95.9% |
| Accurate 4350 | <<locked>> | 80% | 44,237 psi | 69% | 2644 fps | 99.6% |
| Accurate High Country | <<locked>> | 86% | 43,076 psi | 68% | 2707 fps | 95% |
| Accurate MAGPRO | <<locked>> | 92% | 49,850 psi | 78% | 2815 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 51,300 psi | 80% | 2707 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 41,626 psi | 65% | 2612 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 90% | 45,136 psi | 71% | 2703 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 96% | 36,825 psi | 58% | 2569 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 41,930 psi | 66% | 2612 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,721 psi | 83% | 2736 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,698 psi | 65% | 2641 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,558 psi | 75% | 2753 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 41,553 psi | 65% | 2608 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 86% | 39,740 psi | 62% | 2608 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,807 psi | 50% | 2428 fps | 98.7% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,734 psi | 50% | 2438 fps | 95.6% |
| Alliant Reloder-26 | 78.1 gr | 80% | 34,316 psi | 54% | 2543 fps | 97.6% |
| Bofors RP15 | <<locked>> | 88% | 39,450 psi | 62% | 2602 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 54,012 psi | 85% | 2756 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 41,974 psi | 66% | 2680 fps | 95.2% |
| Bofors RP5 | <<locked>> | 86% | 39,740 psi | 62% | 2608 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 46,789 psi | 73% | 2635 fps | 98% |
| Hodgdon H1000 | <<locked>> | 96% | 44,672 psi | 70% | 2687 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 53,809 psi | 84% | 2769 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,252 psi | 71% | 2674 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 47,703 psi | 75% | 2687 fps | 97.6% |
| Hodgdon H4831 | <<locked>> | 90% | 48,211 psi | 76% | 2710 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 47,239 psi | 74% | 2694 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,610 psi | 62% | 2533 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 39,378 psi | 62% | 2671 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 44,338 psi | 69% | 2690 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,862 psi | 44% | 1594 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,998 psi | 85% | 2740 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,235 psi | 66% | 2566 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,790 psi | 75% | 2657 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 41,959 psi | 66% | 2589 fps | 99.4% |
| IMR 4955 Enduron | <<locked>> | 88% | 46,920 psi | 74% | 2654 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 92% | 46,267 psi | 73% | 2740 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 45,919 psi | 72% | 2618 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 44,338 psi | 69% | 2608 fps | 98.1% |
| Lovex S071 | <<locked>> | 84% | 33,112 psi | 52% | 2392 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 41,901 psi | 66% | 2595 fps | 95.5% |
| Norma MRP | 77.7 gr | 82% | 36,521 psi | 57% | 2562 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 43,076 psi | 68% | 2625 fps | 99.5% |
| Ramshot Grand | <<locked>> | 90% | 43,323 psi | 68% | 2690 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 41,713 psi | 65% | 2612 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 90% | 39,059 psi | 61% | 2579 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,529 psi | 45% | 1637 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,258 psi | 83% | 2746 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,299 psi | 79% | 2795 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,729 psi | 69% | 2657 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,713 psi | 65% | 2661 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 36,564 psi | 57% | 2592 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 50,923 psi | 80% | 2703 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 45,774 psi | 72% | 2641 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 84% | 40,915 psi | 64% | 2595 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 46,789 psi | 73% | 2635 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,919 psi | 72% | 2618 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 80% | 44,338 psi | 69% | 2608 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,445 psi | 81% | 2749 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,705 psi | 79% | 2589 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,947 psi | 70% | 2566 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 40,538 psi | 64% | 2589 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 50,647 psi | 79% | 2700 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 46,949 psi | 74% | 2631 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 39,885 psi | 63% | 2589 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,028 psi | 58% | 2480 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 48,428 psi | 76% | 2628 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,367 psi | 70% | 2618 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 38,522 psi | 60% | 2507 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 44,005 psi | 69% | 2625 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 35,679 psi | 56% | 2503 fps | 98.7% |
| Vihtavuori N560 | 85.3 gr | 90% | 47,558 psi | 75% | 2776 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 94% | 44,672 psi | 70% | 2707 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,192 psi | 68% | 2579 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,252 psi | 71% | 2674 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 28,558 psi | 45% | 2431 fps | 98.6% |
| Winchester Supreme 780 | <<locked>> | 86% | 40,785 psi | 64% | 2559 fps | 95.4% |
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 78 powders for .338 Rem. Ultra Mag. loaded with the .338 | 210gr | Impala RNFP KO. Winchester StaBALL HD delivers the highest muzzle velocity at 2,989 fps; across all powders the maximum-charge window runs from 1,781 fps to 2,989 fps. ADI AR 2225 gives the best case fill at 100 %, and 78 of the 78 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 1:15.0 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. Norma MRP, Vihtavuori N560, Alliant Reloder-26 rank at the top here: for .338 Rem. Ultra 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.