Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 210gr | Swift Scirocco bullet and 90 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Vihtavuori N560.
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 2495 | <<locked>> | 82% | 57,232 psi | 90% | 2717 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,665 psi | 86% | 2736 fps | 98.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 57,246 psi | 90% | 2835 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 54,157 psi | 85% | 2726 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,201 psi | 87% | 2831 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 55,593 psi | 87% | 2917 fps | 96.7% |
| ADI AR 2208 | <<locked>> | 86% | 57,421 psi | 90% | 2805 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,202 psi | 88% | 2874 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 98% | 53,954 psi | 85% | 2867 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,377 psi | 90% | 2927 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,998 psi | 86% | 2779 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,085 psi | 86% | 2799 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,985 psi | 88% | 2887 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,479 psi | 90% | 2907 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,695 psi | 87% | 2864 fps | 98.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,942 psi | 89% | 2920 fps | 99% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,809 psi | 84% | 2848 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,572 psi | 73% | 2782 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,085 psi | 85% | 2933 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,011 psi | 82% | 2844 fps | 98.2% |
| Bofors RP3 | <<locked>> | 84% | 55,941 psi | 88% | 2795 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,942 psi | 89% | 2920 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 55,143 psi | 86% | 2782 fps | 99.1% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,296 psi | 73% | 2723 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 84% | 56,188 psi | 88% | 2812 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 57,319 psi | 90% | 2881 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 88% | 56,782 psi | 89% | 2841 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 96% | 53,925 psi | 85% | 2812 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,652 psi | 89% | 2851 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,434 psi | 88% | 2808 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,638 psi | 90% | 2844 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,672 psi | 72% | 2818 fps | 97.7% |
| Hodgdon Superformance | <<locked>> | 88% | 53,737 psi | 84% | 2858 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,579 psi | 57% | 1772 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,913 psi | 89% | 2789 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,854 psi | 88% | 2772 fps | 99.5% |
| IMR 4350 | <<locked>> | 92% | 56,434 psi | 88% | 2815 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,739 psi | 89% | 2808 fps | 99.5% |
| IMR 4831 | <<locked>> | 92% | 55,709 psi | 87% | 2822 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,507 psi | 89% | 2828 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,521 psi | 87% | 2802 fps | 97.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,085 psi | 86% | 2897 fps | 97.7% |
| Lovex S062 | <<locked>> | 84% | 57,305 psi | 90% | 2782 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,014 psi | 89% | 2805 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 55,071 psi | 86% | 2795 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,514 psi | 74% | 2694 fps | 99.2% |
| Norma 203B | <<locked>> | 82% | 54,389 psi | 85% | 2785 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,392 psi | 90% | 2867 fps | 98.7% |
| Norma MRP | <<locked>> | 98% | 56,623 psi | 89% | 2946 fps | 99.7% |
| Norma URP | <<locked>> | 92% | 57,450 psi | 90% | 2867 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,347 psi | 87% | 2808 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,651 psi | 87% | 2913 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 92% | 56,434 psi | 88% | 2871 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,792 psi | 78% | 2789 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,130 psi | 58% | 1811 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,072 psi | 88% | 2795 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,782 psi | 89% | 2897 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,100 psi | 86% | 2851 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,435 psi | 90% | 2933 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,948 psi | 72% | 2815 fps | 98.8% |
| Rottweil R 902 | <<locked>> | 82% | 55,637 psi | 87% | 2746 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,956 psi | 88% | 2789 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,215 psi | 85% | 2792 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 96% | 54,824 psi | 86% | 2848 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 88% | 55,143 psi | 86% | 2782 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,014 psi | 89% | 2805 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,305 psi | 90% | 2782 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,071 psi | 86% | 2795 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 53,940 psi | 85% | 2799 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,666 psi | 89% | 2677 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,710 psi | 89% | 2759 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,360 psi | 85% | 2844 fps | 98.6% |
| Somchem S355 | <<locked>> | 86% | 55,883 psi | 88% | 2789 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,941 psi | 88% | 2779 fps | 97% |
| Somchem S365 | <<locked>> | 94% | 57,116 psi | 90% | 2864 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,564 psi | 87% | 2825 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 82% | 55,956 psi | 88% | 2703 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,231 psi | 88% | 2717 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,276 psi | 90% | 2759 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,840 psi | 88% | 2808 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,882 psi | 86% | 2799 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 54,505 psi | 85% | 2713 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,172 psi | 86% | 2815 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,188 psi | 88% | 2874 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,695 psi | 89% | 2936 fps | 97.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 48,588 psi | 76% | 2789 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,593 psi | 87% | 2772 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,522 psi | 90% | 2884 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,429 psi | 77% | 2913 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,666 psi | 87% | 2818 fps | 98.6% |
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% | 53,693 psi | 84% | 2674 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,111 psi | 80% | 2684 fps | 98.4% |
| Accurate 3100 | <<locked>> | 84% | 33,040 psi | 52% | 2408 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 50,879 psi | 80% | 2680 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,044 psi | 61% | 2559 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 96% | 51,721 psi | 81% | 2858 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 47,659 psi | 75% | 2657 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 40,466 psi | 63% | 2595 fps | 95% |
| ADI AR 2213 | <<locked>> | 94% | 47,108 psi | 74% | 2749 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,374 psi | 84% | 2871 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,472 psi | 76% | 2684 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,619 psi | 81% | 2749 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,869 psi | 59% | 2572 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,134 psi | 68% | 2690 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 40,176 psi | 63% | 2592 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 90% | 40,538 psi | 64% | 2638 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,876 psi | 44% | 2333 fps | 97% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,662 psi | 50% | 2448 fps | 95.3% |
| Alliant Reloder-26 | 76.5 gr | 80% | 29,907 psi | 47% | 2438 fps | 95.4% |
| Bofors RP15 | <<locked>> | 92% | 40,001 psi | 63% | 2625 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 48,907 psi | 77% | 2694 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 40,538 psi | 64% | 2638 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 42,815 psi | 67% | 2572 fps | 96.9% |
| Hodgdon H1000 | <<locked>> | 98% | 43,221 psi | 68% | 2661 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 49,240 psi | 77% | 2707 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 41,002 psi | 64% | 2605 fps | 97.1% |
| Hodgdon H4350 | <<locked>> | 80% | 43,816 psi | 69% | 2621 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 94% | 50,357 psi | 79% | 2753 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 49,414 psi | 77% | 2740 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,404 psi | 55% | 2464 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,766 psi | 84% | 2792 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 40,016 psi | 63% | 2694 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 40,045 psi | 63% | 2615 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 43% | 1585 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,111 psi | 79% | 2690 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,402 psi | 82% | 2720 fps | 99.1% |
| IMR 4350 | <<locked>> | 80% | 38,392 psi | 60% | 2500 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,251 psi | 69% | 2602 fps | 97.7% |
| IMR 4831 | <<locked>> | 80% | 37,521 psi | 59% | 2513 fps | 98.6% |
| IMR 4895 | <<locked>> | 80% | 52,968 psi | 83% | 2776 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 49,037 psi | 77% | 2697 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 94% | 44,889 psi | 70% | 2720 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 50,546 psi | 79% | 2687 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,800 psi | 66% | 2556 fps | 98.3% |
| Lovex S070 | <<locked>> | 80% | 40,103 psi | 63% | 2536 fps | 97% |
| Lovex S071 | <<locked>> | 88% | 32,155 psi | 50% | 2388 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 50,981 psi | 80% | 2736 fps | 100% |
| Norma 204 | <<locked>> | 82% | 40,712 psi | 64% | 2582 fps | 95% |
| Norma MRP | 79.8 gr | 86% | 37,101 psi | 58% | 2592 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 38,798 psi | 61% | 2556 fps | 98.7% |
| Ramshot Big Game | <<locked>> | 80% | 51,677 psi | 81% | 2759 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 44,860 psi | 70% | 2730 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 37,652 psi | 59% | 2543 fps | 97% |
| Ramshot Magnum | <<locked>> | 94% | 39,929 psi | 63% | 2608 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,746 psi | 43% | 1621 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,168 psi | 77% | 2690 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,788 psi | 72% | 2740 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,856 psi | 61% | 2575 fps | 98.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,652 psi | 59% | 2585 fps | 98.1% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 36,999 psi | 58% | 2615 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 52,344 psi | 82% | 2700 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,151 psi | 72% | 2644 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,628 psi | 70% | 2628 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 88% | 41,887 psi | 66% | 2625 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 42,815 psi | 67% | 2572 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,800 psi | 66% | 2556 fps | 98.3% |
| Shooters World Precision | <<locked>> | 80% | 50,546 psi | 79% | 2687 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,103 psi | 63% | 2536 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,340 psi | 74% | 2697 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,123 psi | 74% | 2549 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,944 psi | 64% | 2500 fps | 97.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 41,510 psi | 65% | 2618 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 46,267 psi | 73% | 2641 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,936 psi | 77% | 2671 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 35,201 psi | 55% | 2513 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 37,347 psi | 59% | 2503 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 52,736 psi | 83% | 2661 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,895 psi | 83% | 2674 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,251 psi | 69% | 2572 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,089 psi | 63% | 2552 fps | 98.9% |
| Vihtavuori N165 | <<locked>> | 90% | 39,320 psi | 62% | 2533 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 51,140 psi | 80% | 2667 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,682 psi | 62% | 2552 fps | 98.7% |
| Vihtavuori N555 | <<locked>> | 80% | 30,806 psi | 48% | 2405 fps | 97% |
| Vihtavuori N560 | 85.4 gr | 92% | 46,180 psi | 72% | 2759 fps | 95% |
| Vihtavuori N565 | <<locked>> | 98% | 45,368 psi | 71% | 2730 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,247 psi | 62% | 2520 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 41,133 psi | 64% | 2608 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,700 psi | 39% | 2303 fps | 95.8% |
| Winchester Supreme 780 | <<locked>> | 90% | 42,003 psi | 66% | 2592 fps | 95.7% |
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 90 powders for .338 Rem. Ultra Mag. loaded with the .338 | 210gr | Swift Scirocco. Norma MRP delivers the highest muzzle velocity at 2,946 fps; across all powders the maximum-charge window runs from 1,772 fps to 2,946 fps. Accurate 3100 gives the best case fill at 100 %, and 90 of the 90 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 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, Alliant Reloder-23 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, Norma MRP, Vihtavuori N560 rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 210gr | Swift Scirocco 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.