Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 210gr | Rhino Penetrator bullet and 91 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 2700 | <<locked>> | 82% | 55,869 psi | 88% | 2762 fps | 99.2% |
| Accurate 3100 | <<locked>> | 98% | 55,114 psi | 86% | 2808 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 55,492 psi | 87% | 2746 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,811 psi | 89% | 2858 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 56,231 psi | 88% | 2949 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 98% | 57,493 psi | 90% | 2949 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 84% | 55,172 psi | 86% | 2779 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,696 psi | 90% | 2900 fps | 99% |
| ADI AR 2213 | <<locked>> | 98% | 55,317 psi | 87% | 2897 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,232 psi | 60% | 2618 fps | 96.6% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 57,711 psi | 90% | 2897 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 57,711 psi | 90% | 2897 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,231 psi | 88% | 2802 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,275 psi | 88% | 2822 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,348 psi | 90% | 2910 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,085 psi | 86% | 2877 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,927 psi | 89% | 2887 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,665 psi | 86% | 2894 fps | 98.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,448 psi | 87% | 2871 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,037 psi | 75% | 2812 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,999 psi | 88% | 2959 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,650 psi | 84% | 2874 fps | 98.5% |
| Bofors RP3 | <<locked>> | 84% | 57,334 psi | 90% | 2818 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 54,665 psi | 86% | 2894 fps | 98.8% |
| Bofors RP7 | <<locked>> | 88% | 56,362 psi | 88% | 2805 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,601 psi | 75% | 2753 fps | 96.9% |
| Hodgdon H380 | <<locked>> | 84% | 57,464 psi | 90% | 2835 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,100 psi | 86% | 2854 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 86% | 54,476 psi | 85% | 2812 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 96% | 55,506 psi | 87% | 2841 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,288 psi | 85% | 2822 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 57,696 psi | 90% | 2828 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,079 psi | 74% | 2854 fps | 98.2% |
| Hodgdon Superformance | <<locked>> | 88% | 55,448 psi | 87% | 2887 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,666 psi | 57% | 1781 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 54,534 psi | 85% | 2762 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,913 psi | 89% | 2795 fps | 99.6% |
| IMR 4350 | <<locked>> | 92% | 57,740 psi | 90% | 2838 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,418 psi | 85% | 2779 fps | 99.4% |
| IMR 4831 | <<locked>> | 92% | 57,145 psi | 90% | 2844 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,740 psi | 90% | 2848 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,869 psi | 89% | 2828 fps | 97.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,637 psi | 89% | 2930 fps | 98.1% |
| Lovex S062 | <<locked>> | 82% | 54,926 psi | 86% | 2756 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,708 psi | 86% | 2779 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 56,260 psi | 88% | 2822 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,820 psi | 77% | 2717 fps | 99.4% |
| Norma 203B | <<locked>> | 82% | 55,608 psi | 87% | 2808 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,027 psi | 86% | 2838 fps | 98.5% |
| Norma MRP | <<locked>> | 96% | 54,375 psi | 85% | 2917 fps | 99.6% |
| Norma URP | <<locked>> | 90% | 55,259 psi | 87% | 2841 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,623 psi | 89% | 2831 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 57,493 psi | 90% | 2949 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 90% | 54,215 psi | 85% | 2841 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,445 psi | 81% | 2822 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,391 psi | 59% | 1824 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,246 psi | 90% | 2818 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,447 psi | 85% | 2867 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,753 psi | 89% | 2874 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,027 psi | 86% | 2904 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,340 psi | 74% | 2851 fps | 99.2% |
| Rottweil R 902 | <<locked>> | 82% | 56,666 psi | 89% | 2762 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,377 psi | 90% | 2812 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,463 psi | 87% | 2815 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 96% | 56,420 psi | 88% | 2877 fps | 99% |
| Rottweil R 907 | <<locked>> | 88% | 56,362 psi | 88% | 2805 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,708 psi | 86% | 2779 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 54,926 psi | 86% | 2756 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,260 psi | 88% | 2822 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,230 psi | 87% | 2818 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,389 psi | 85% | 2651 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,201 psi | 85% | 2730 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,941 psi | 88% | 2871 fps | 98.9% |
| Somchem S355 | <<locked>> | 86% | 56,985 psi | 89% | 2805 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 57,392 psi | 90% | 2808 fps | 97.4% |
| Somchem S365 | <<locked>> | 92% | 55,114 psi | 86% | 2841 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 57,058 psi | 89% | 2851 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 82% | 57,363 psi | 90% | 2723 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,406 psi | 90% | 2736 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 54,897 psi | 86% | 2733 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,319 psi | 90% | 2831 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,492 psi | 89% | 2825 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 82% | 55,593 psi | 87% | 2733 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,521 psi | 89% | 2838 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 54,215 psi | 85% | 2851 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 54,433 psi | 85% | 2907 fps | 97.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 50,314 psi | 79% | 2818 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,029 psi | 89% | 2792 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,100 psi | 86% | 2854 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,750 psi | 81% | 2946 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 57,305 psi | 90% | 2844 fps | 98.9% |
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 2700 | <<locked>> | 80% | 52,272 psi | 82% | 2710 fps | 98.7% |
| Accurate 3100 | <<locked>> | 82% | 31,734 psi | 50% | 2379 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 52,040 psi | 82% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,190 psi | 63% | 2585 fps | 99.1% |
| Accurate High Country | <<locked>> | 90% | 45,658 psi | 72% | 2769 fps | 95.9% |
| Accurate MAGPRO | <<locked>> | 94% | 49,705 psi | 78% | 2828 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 48,776 psi | 76% | 2684 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 41,321 psi | 65% | 2618 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 92% | 45,136 psi | 71% | 2717 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 98% | 35,911 psi | 56% | 2562 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 41,698 psi | 65% | 2625 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 41,698 psi | 65% | 2625 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,472 psi | 78% | 2703 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,823 psi | 83% | 2772 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,783 psi | 61% | 2595 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,440 psi | 70% | 2713 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 41,249 psi | 65% | 2618 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 90% | 41,727 psi | 65% | 2664 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,601 psi | 45% | 2359 fps | 97.5% |
| Alliant Reloder-25 | <<locked>> | 88% | 32,489 psi | 51% | 2474 fps | 96% |
| Alliant Reloder-26 | 78.3 gr | 80% | 30,850 psi | 48% | 2470 fps | 96.1% |
| Bofors RP15 | <<locked>> | 92% | 41,162 psi | 65% | 2651 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 50,154 psi | 79% | 2717 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 41,727 psi | 65% | 2664 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 43,714 psi | 69% | 2595 fps | 97.3% |
| Hodgdon H1000 | <<locked>> | 98% | 44,338 psi | 69% | 2690 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 50,372 psi | 79% | 2730 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 42,047 psi | 66% | 2631 fps | 97.5% |
| Hodgdon H4350 | <<locked>> | 80% | 44,860 psi | 70% | 2648 fps | 96.9% |
| Hodgdon H4831 | <<locked>> | 92% | 48,414 psi | 76% | 2726 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 47,369 psi | 74% | 2710 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,361 psi | 57% | 2487 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 94% | 38,609 psi | 61% | 2667 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 41,089 psi | 64% | 2641 fps | 96.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,311 psi | 43% | 1591 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,314 psi | 80% | 2713 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,461 psi | 84% | 2743 fps | 99.3% |
| IMR 4350 | <<locked>> | 80% | 39,363 psi | 62% | 2523 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,121 psi | 71% | 2625 fps | 98% |
| IMR 4831 | <<locked>> | 80% | 38,479 psi | 60% | 2536 fps | 98.9% |
| IMR 4895 | <<locked>> | 80% | 54,201 psi | 85% | 2799 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 46,934 psi | 74% | 2667 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 94% | 46,195 psi | 72% | 2749 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 51,561 psi | 81% | 2707 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,714 psi | 67% | 2575 fps | 98.6% |
| Lovex S070 | <<locked>> | 80% | 40,973 psi | 64% | 2559 fps | 97.3% |
| Lovex S071 | <<locked>> | 88% | 33,127 psi | 52% | 2415 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 52,170 psi | 82% | 2759 fps | 100% |
| Norma 204 | <<locked>> | 82% | 41,684 psi | 65% | 2608 fps | 95.5% |
| Norma MRP | 79.8 gr | 84% | 35,650 psi | 56% | 2559 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 39,755 psi | 62% | 2579 fps | 99% |
| Ramshot Big Game | <<locked>> | 80% | 52,765 psi | 83% | 2779 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 42,917 psi | 67% | 2697 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 38,682 psi | 61% | 2566 fps | 97.4% |
| Ramshot Magnum | <<locked>> | 92% | 38,363 psi | 60% | 2579 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,891 psi | 44% | 1631 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,169 psi | 79% | 2713 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,181 psi | 74% | 2762 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,059 psi | 63% | 2602 fps | 98.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,566 psi | 60% | 2608 fps | 98.5% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 35,592 psi | 56% | 2585 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 53,403 psi | 84% | 2720 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,166 psi | 74% | 2664 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 45,716 psi | 72% | 2654 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 86% | 40,364 psi | 63% | 2598 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 43,714 psi | 69% | 2595 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,714 psi | 67% | 2575 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 51,561 psi | 81% | 2707 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,973 psi | 64% | 2559 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,457 psi | 76% | 2717 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,921 psi | 75% | 2566 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,771 psi | 65% | 2520 fps | 97.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 40,001 psi | 63% | 2595 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 47,253 psi | 74% | 2661 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 46,978 psi | 74% | 2644 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 36,318 psi | 57% | 2536 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 38,406 psi | 60% | 2530 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 80% | 53,693 psi | 84% | 2677 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,896 psi | 84% | 2690 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,179 psi | 71% | 2592 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,162 psi | 65% | 2575 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 88% | 37,869 psi | 59% | 2507 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 52,228 psi | 82% | 2687 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,698 psi | 64% | 2579 fps | 99% |
| Vihtavuori N555 | <<locked>> | 80% | 31,865 psi | 50% | 2434 fps | 97.5% |
| Vihtavuori N560 | 87.3 gr | 92% | 47,369 psi | 74% | 2785 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 98% | 46,905 psi | 74% | 2759 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,219 psi | 63% | 2539 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,206 psi | 66% | 2635 fps | 97.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,367 psi | 40% | 2336 fps | 96.6% |
| Winchester Supreme 780 | <<locked>> | 88% | 40,335 psi | 63% | 2562 fps | 95.3% |
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 91 powders for .338 Rem. Ultra Mag. loaded with the .338 | 210gr | Rhino Penetrator. Alliant Reloder-26 delivers the highest muzzle velocity at 2,959 fps; across all powders the maximum-charge window runs from 1,781 fps to 2,959 fps. ADI AR 2225 gives the best case fill at 100 %, and 91 of the 91 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 1:15.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-23, Alliant Reloder-25 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 | Rhino Penetrator 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.