Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 225gr | CutEdge Maximus bullet and 92 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate High Country, 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% | 57,305 psi | 90% | 2635 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 55,158 psi | 86% | 2667 fps | 99.3% |
| Accurate 3100 | <<locked>> | 98% | 53,824 psi | 84% | 2713 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 54,288 psi | 85% | 2644 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,927 psi | 88% | 2756 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 55,405 psi | 87% | 2854 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 98% | 56,478 psi | 89% | 2854 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 84% | 54,737 psi | 86% | 2684 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,942 psi | 89% | 2805 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 98% | 54,723 psi | 86% | 2805 fps | 98.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,420 psi | 59% | 2533 fps | 97% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 57,159 psi | 90% | 2802 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,477 psi | 87% | 2700 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,709 psi | 87% | 2726 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,826 psi | 89% | 2812 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 54,259 psi | 85% | 2779 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,376 psi | 88% | 2792 fps | 99.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,711 psi | 90% | 2851 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,679 psi | 86% | 2776 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,210 psi | 74% | 2720 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,042 psi | 86% | 2861 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,765 psi | 83% | 2779 fps | 98.8% |
| Bofors RP3 | <<locked>> | 84% | 56,347 psi | 88% | 2717 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,033 psi | 67% | 2644 fps | 96.2% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,711 psi | 90% | 2851 fps | 99.4% |
| Bofors RP7 | <<locked>> | 88% | 55,724 psi | 87% | 2713 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,891 psi | 73% | 2667 fps | 97.3% |
| Hodgdon H380 | <<locked>> | 84% | 56,681 psi | 89% | 2736 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 54,317 psi | 85% | 2756 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 88% | 57,421 psi | 90% | 2769 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 96% | 54,897 psi | 86% | 2749 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 57,508 psi | 90% | 2785 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 57,159 psi | 90% | 2733 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,296 psi | 73% | 2762 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 88% | 54,766 psi | 86% | 2792 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,405 psi | 57% | 1706 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,609 psi | 90% | 2713 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,536 psi | 89% | 2703 fps | 99.8% |
| IMR 4350 | <<locked>> | 92% | 57,101 psi | 89% | 2746 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,435 psi | 90% | 2736 fps | 99.8% |
| IMR 4831 | <<locked>> | 92% | 56,333 psi | 88% | 2749 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,159 psi | 90% | 2749 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,101 psi | 88% | 2736 fps | 97.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,985 psi | 88% | 2835 fps | 98.4% |
| Lovex S062 | <<locked>> | 84% | 57,638 psi | 90% | 2703 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,421 psi | 90% | 2730 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 55,448 psi | 87% | 2723 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,747 psi | 75% | 2621 fps | 99.5% |
| Norma 203B | <<locked>> | 82% | 55,013 psi | 86% | 2710 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,230 psi | 85% | 2743 fps | 98.7% |
| Norma MRP | <<locked>> | 98% | 57,711 psi | 90% | 2881 fps | 99.9% |
| Norma URP | <<locked>> | 90% | 54,534 psi | 85% | 2743 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,883 psi | 88% | 2733 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,565 psi | 89% | 2851 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 92% | 57,072 psi | 89% | 2795 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,546 psi | 79% | 2730 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,130 psi | 58% | 1749 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,666 psi | 89% | 2723 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 57,725 psi | 90% | 2818 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,883 psi | 88% | 2779 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,418 psi | 85% | 2805 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,369 psi | 73% | 2756 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 82% | 55,999 psi | 88% | 2667 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,405 psi | 88% | 2713 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,911 psi | 86% | 2723 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 96% | 55,738 psi | 87% | 2782 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 88% | 55,724 psi | 87% | 2713 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,421 psi | 90% | 2730 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,638 psi | 90% | 2703 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,448 psi | 87% | 2723 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,636 psi | 86% | 2723 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,305 psi | 90% | 2598 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,174 psi | 90% | 2687 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,274 psi | 87% | 2779 fps | 99.1% |
| Somchem S355 | <<locked>> | 86% | 56,304 psi | 88% | 2707 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,666 psi | 89% | 2717 fps | 97.7% |
| Somchem S365 | <<locked>> | 92% | 54,317 psi | 85% | 2743 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,188 psi | 88% | 2756 fps | 99.6% |
| Vihtavuori N135 | <<locked>> | 82% | 56,623 psi | 89% | 2625 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,855 psi | 89% | 2641 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 54,099 psi | 85% | 2638 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,695 psi | 89% | 2736 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,695 psi | 87% | 2733 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 82% | 54,926 psi | 86% | 2635 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,738 psi | 87% | 2743 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 57,087 psi | 89% | 2802 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 53,693 psi | 84% | 2812 fps | 97.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,327 psi | 77% | 2726 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,362 psi | 88% | 2697 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,505 psi | 85% | 2759 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,676 psi | 79% | 2844 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,550 psi | 89% | 2753 fps | 99.1% |
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% | 53,679 psi | 84% | 2592 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,648 psi | 81% | 2618 fps | 98.9% |
| Accurate 3100 | <<locked>> | 82% | 30,763 psi | 48% | 2290 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 50,923 psi | 80% | 2602 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,189 psi | 61% | 2490 fps | 99.3% |
| Accurate High Country | 80.3 gr | 88% | 41,698 psi | 65% | 2618 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 94% | 48,834 psi | 77% | 2733 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 48,240 psi | 76% | 2589 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 38,087 psi | 60% | 2477 fps | 95% |
| ADI AR 2213 | <<locked>> | 92% | 44,527 psi | 70% | 2631 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 98% | 34,969 psi | 55% | 2474 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 38,247 psi | 60% | 2477 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,863 psi | 77% | 2608 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,112 psi | 82% | 2674 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,159 psi | 60% | 2503 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,627 psi | 68% | 2618 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 37,869 psi | 59% | 2470 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 88% | 38,145 psi | 60% | 2516 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,833 psi | 44% | 2270 fps | 97.7% |
| Alliant Reloder-25 | <<locked>> | 86% | 29,791 psi | 47% | 2333 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 29,950 psi | 47% | 2379 fps | 96.4% |
| Bofors RP15 | <<locked>> | 90% | 37,782 psi | 59% | 2510 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 49,255 psi | 77% | 2618 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 40,074 psi | 63% | 2585 fps | 95.2% |
| Bofors RP5 | <<locked>> | 88% | 38,145 psi | 60% | 2516 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 43,047 psi | 67% | 2503 fps | 97.6% |
| Hodgdon H1000 | <<locked>> | 96% | 40,683 psi | 64% | 2546 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 49,501 psi | 78% | 2635 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 41,278 psi | 65% | 2539 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 80% | 44,266 psi | 69% | 2559 fps | 97.3% |
| Hodgdon H4831 | <<locked>> | 92% | 47,688 psi | 75% | 2635 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 46,731 psi | 73% | 2621 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,621 psi | 56% | 2398 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 94% | 37,811 psi | 59% | 2579 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 40,364 psi | 63% | 2552 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,282 psi | 43% | 1529 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,734 psi | 80% | 2618 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,953 psi | 83% | 2651 fps | 99.5% |
| IMR 4350 | <<locked>> | 80% | 38,696 psi | 61% | 2438 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,643 psi | 70% | 2536 fps | 98.3% |
| IMR 4831 | <<locked>> | 80% | 37,739 psi | 59% | 2448 fps | 99.1% |
| IMR 4895 | <<locked>> | 80% | 53,461 psi | 84% | 2700 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 46,354 psi | 73% | 2579 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 92% | 42,554 psi | 67% | 2605 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 50,807 psi | 80% | 2612 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,974 psi | 66% | 2484 fps | 98.8% |
| Lovex S070 | <<locked>> | 80% | 40,263 psi | 63% | 2470 fps | 97.6% |
| Lovex S071 | <<locked>> | 88% | 32,053 psi | 50% | 2323 fps | 95.9% |
| Norma 203B | <<locked>> | 80% | 51,459 psi | 81% | 2661 fps | 100% |
| Norma 204 | <<locked>> | 82% | 41,104 psi | 64% | 2520 fps | 95.9% |
| Norma MRP | 76.6 gr | 84% | 34,780 psi | 55% | 2470 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 39,088 psi | 61% | 2487 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 80% | 52,243 psi | 82% | 2684 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 42,206 psi | 66% | 2608 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 37,913 psi | 59% | 2477 fps | 97.7% |
| Ramshot Magnum | <<locked>> | 92% | 37,492 psi | 59% | 2490 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,688 psi | 43% | 1565 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,501 psi | 78% | 2618 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,383 psi | 73% | 2664 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,262 psi | 62% | 2510 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,942 psi | 59% | 2520 fps | 98.7% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,664 psi | 54% | 2493 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 52,547 psi | 82% | 2621 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,354 psi | 73% | 2569 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 42,279 psi | 66% | 2513 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 86% | 39,595 psi | 62% | 2510 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 80% | 43,047 psi | 67% | 2503 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,974 psi | 66% | 2484 fps | 98.8% |
| Shooters World Precision | <<locked>> | 80% | 50,807 psi | 80% | 2612 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,263 psi | 63% | 2470 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,761 psi | 75% | 2621 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,384 psi | 74% | 2474 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,104 psi | 64% | 2434 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 39,233 psi | 61% | 2503 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 46,514 psi | 73% | 2569 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 46,195 psi | 72% | 2556 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 35,476 psi | 56% | 2444 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 34,983 psi | 55% | 2385 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 53,040 psi | 83% | 2582 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,359 psi | 84% | 2598 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,556 psi | 70% | 2500 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,422 psi | 63% | 2484 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 37,043 psi | 58% | 2421 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 51,445 psi | 81% | 2592 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,813 psi | 62% | 2484 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 80% | 30,835 psi | 48% | 2339 fps | 97.7% |
| Vihtavuori N560 | 82.1 gr | 90% | 43,555 psi | 68% | 2635 fps | 95% |
| Vihtavuori N565 | <<locked>> | 96% | 42,801 psi | 67% | 2612 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,552 psi | 62% | 2451 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,437 psi | 65% | 2543 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,497 psi | 38% | 2247 fps | 96.8% |
| Winchester Supreme 780 | <<locked>> | 88% | 39,624 psi | 62% | 2477 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 92 powders for .338 Rem. Ultra Mag. loaded with the .338 | 225gr | CutEdge Maximus. Norma MRP delivers the highest muzzle velocity at 2,881 fps; across all powders the maximum-charge window runs from 1,706 fps to 2,881 fps. ADI AR 2225 gives the best case fill at 100 %, and 92 of the 92 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 225.0 gr projectile in 0.338" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, 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. Accurate High Country, Norma MRP, Vihtavuori N560 rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 225gr | CutEdge Maximus 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.