Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 225gr | Sierra Pro-Hunter bullet and 84 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.
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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% | 54,549 psi | 85% | 2723 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 56,289 psi | 88% | 2762 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 56,086 psi | 88% | 2867 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 96% | 57,058 psi | 89% | 2867 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 84% | 57,682 psi | 90% | 2730 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,072 psi | 89% | 2815 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 96% | 54,708 psi | 86% | 2812 fps | 98.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 45,687 psi | 72% | 2648 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,611 psi | 64% | 2612 fps | 98.4% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 57,130 psi | 90% | 2808 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 57,130 psi | 90% | 2808 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,361 psi | 87% | 2703 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,797 psi | 89% | 2815 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,447 psi | 85% | 2779 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,376 psi | 88% | 2799 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,389 psi | 85% | 2808 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,259 psi | 87% | 2782 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,126 psi | 80% | 2785 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,883 psi | 88% | 2871 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 56,927 psi | 89% | 2769 fps | 95.9% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,000 psi | 89% | 2844 fps | 99.4% |
| Bofors RP3 | <<locked>> | 82% | 56,376 psi | 88% | 2717 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,065 psi | 74% | 2717 fps | 97.5% |
| Bofors RP5 | <<locked>> | 96% | 54,389 psi | 85% | 2808 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 55,448 psi | 87% | 2713 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,430 psi | 79% | 2733 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 82% | 56,434 psi | 88% | 2736 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,346 psi | 85% | 2759 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 86% | 57,188 psi | 90% | 2772 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 94% | 54,723 psi | 86% | 2753 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 57,377 psi | 90% | 2792 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 57,305 psi | 90% | 2740 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,096 psi | 79% | 2838 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 86% | 54,737 psi | 86% | 2795 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,825 psi | 58% | 1726 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,058 psi | 89% | 2710 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,753 psi | 89% | 2746 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,913 psi | 89% | 2736 fps | 99.8% |
| IMR 4831 | <<locked>> | 90% | 56,376 psi | 88% | 2749 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,072 psi | 88% | 2743 fps | 98% |
| IMR 7828 SSC | <<locked>> | 98% | 56,188 psi | 88% | 2844 fps | 98.6% |
| Lovex S062 | <<locked>> | 82% | 57,522 psi | 90% | 2703 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,348 psi | 90% | 2733 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,506 psi | 87% | 2730 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,938 psi | 81% | 2687 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 54,157 psi | 85% | 2746 fps | 98.9% |
| Norma 217ᴾ | <<locked>> | 100% | 36,056 psi | 56% | 2533 fps | 96.2% |
| Norma MRP | <<locked>> | 94% | 54,244 psi | 85% | 2831 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 54,665 psi | 86% | 2746 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,913 psi | 89% | 2864 fps | 99% |
| Ramshot Hunter | <<locked>> | 90% | 57,276 psi | 90% | 2802 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,984 psi | 86% | 2799 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,608 psi | 59% | 1768 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,159 psi | 88% | 2723 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 53,896 psi | 84% | 2769 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,202 psi | 88% | 2785 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,447 psi | 85% | 2808 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,502 psi | 79% | 2835 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 84% | 56,623 psi | 89% | 2717 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,723 psi | 86% | 2730 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 94% | 55,912 psi | 88% | 2789 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 86% | 55,448 psi | 87% | 2713 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,348 psi | 90% | 2733 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,522 psi | 90% | 2703 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,506 psi | 87% | 2730 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,375 psi | 85% | 2723 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,768 psi | 89% | 2598 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,840 psi | 89% | 2687 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,448 psi | 87% | 2785 fps | 99.3% |
| Somchem S355 | <<locked>> | 84% | 56,376 psi | 88% | 2713 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,521 psi | 89% | 2723 fps | 97.9% |
| Somchem S365 | <<locked>> | 90% | 54,592 psi | 86% | 2746 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,550 psi | 89% | 2766 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 86% | 57,609 psi | 90% | 2684 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,608 psi | 89% | 2740 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,970 psi | 88% | 2743 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 88% | 55,738 psi | 87% | 2746 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 57,667 psi | 90% | 2808 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,215 psi | 85% | 2822 fps | 97.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 53,722 psi | 84% | 2799 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,260 psi | 88% | 2700 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,563 psi | 86% | 2762 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 56,362 psi | 88% | 2910 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,463 psi | 88% | 2756 fps | 99.3% |
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% | 31,676 psi | 50% | 2310 fps | 95.9% |
| Accurate 4350 | <<locked>> | 80% | 42,728 psi | 67% | 2556 fps | 99.8% |
| Accurate High Country | <<locked>> | 86% | 42,177 psi | 66% | 2628 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 90% | 46,108 psi | 72% | 2690 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 50,865 psi | 80% | 2635 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 38,276 psi | 60% | 2484 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 88% | 41,684 psi | 65% | 2579 fps | 95% |
| ADI AR 2217 | <<locked>> | 98% | 42,743 psi | 67% | 2592 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 94% | 33,460 psi | 52% | 2438 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 38,566 psi | 60% | 2487 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 38,566 psi | 60% | 2487 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,967 psi | 81% | 2657 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,031 psi | 64% | 2562 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,079 psi | 74% | 2674 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 38,189 psi | 60% | 2480 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 86% | 38,754 psi | 61% | 2533 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,429 psi | 48% | 2339 fps | 98.8% |
| Alliant Reloder-25 | <<locked>> | 84% | 30,327 psi | 48% | 2352 fps | 95.9% |
| Alliant Reloder-26 | 78.3 gr | 80% | 32,880 psi | 52% | 2454 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 53,563 psi | 84% | 2717 fps | 95.1% |
| Bofors RP15 | <<locked>> | 88% | 38,406 psi | 60% | 2523 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 52,808 psi | 83% | 2671 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 40,988 psi | 64% | 2602 fps | 95.8% |
| Bofors RP5 | <<locked>> | 86% | 38,754 psi | 61% | 2533 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 45,832 psi | 72% | 2559 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 94% | 41,075 psi | 64% | 2562 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 52,939 psi | 83% | 2687 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,483 psi | 70% | 2598 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 80% | 47,152 psi | 74% | 2615 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 88% | 44,686 psi | 70% | 2589 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 88% | 43,714 psi | 69% | 2572 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,595 psi | 60% | 2454 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 35,926 psi | 56% | 2536 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 43,685 psi | 68% | 2615 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,601 psi | 43% | 1545 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,519 psi | 84% | 2664 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,437 psi | 65% | 2493 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,239 psi | 74% | 2585 fps | 98.9% |
| IMR 4831 | <<locked>> | 80% | 40,741 psi | 64% | 2507 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 43,497 psi | 68% | 2533 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 90% | 42,714 psi | 67% | 2612 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 54,041 psi | 85% | 2657 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,802 psi | 70% | 2539 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 43,149 psi | 68% | 2526 fps | 98.5% |
| Lovex S071 | <<locked>> | 84% | 31,111 psi | 49% | 2297 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 41,263 psi | 65% | 2526 fps | 96.2% |
| Norma 217 | <<locked>> | 98% | 33,765 psi | 53% | 2477 fps | 95.1% |
| Norma MRP | 76 gr | 80% | 32,909 psi | 52% | 2421 fps | 95% |
| Norma URP | <<locked>> | 80% | 42,090 psi | 66% | 2546 fps | 99.7% |
| Ramshot Grand | <<locked>> | 90% | 42,511 psi | 67% | 2618 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 40,959 psi | 64% | 2539 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 88% | 35,317 psi | 55% | 2444 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,079 psi | 44% | 1581 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,605 psi | 82% | 2671 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,966 psi | 78% | 2717 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,627 psi | 67% | 2572 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,872 psi | 64% | 2585 fps | 99.4% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 32,982 psi | 52% | 2451 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 49,705 psi | 78% | 2621 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 42,279 psi | 66% | 2516 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 82% | 37,362 psi | 59% | 2464 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 45,832 psi | 72% | 2559 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,802 psi | 70% | 2539 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 54,041 psi | 85% | 2657 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,149 psi | 68% | 2526 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,053 psi | 80% | 2674 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,111 psi | 79% | 2513 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,801 psi | 69% | 2487 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 37,014 psi | 58% | 2457 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 49,661 psi | 78% | 2618 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 46,166 psi | 72% | 2559 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 38,841 psi | 61% | 2507 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,621 psi | 56% | 2398 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 47,514 psi | 74% | 2546 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,511 psi | 68% | 2543 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 35,099 psi | 55% | 2379 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 42,960 psi | 67% | 2543 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 33,968 psi | 53% | 2408 fps | 98.8% |
| Vihtavuori N560 | 83.6 gr | 88% | 43,859 psi | 69% | 2644 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 94% | 43,743 psi | 69% | 2628 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,482 psi | 67% | 2503 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,628 psi | 70% | 2602 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,021 psi | 42% | 2336 fps | 98.7% |
| Winchester Supreme 780 | <<locked>> | 84% | 37,289 psi | 58% | 2431 fps | 95.1% |
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 84 powders for .338 Rem. Ultra Mag. loaded with the .338 | 225gr | Sierra Pro-Hunter. Winchester StaBALL HD delivers the highest muzzle velocity at 2,910 fps; across all powders the maximum-charge window runs from 1,726 fps to 2,910 fps. ADI AR 2217 gives the best case fill at 100 %, and 84 of the 84 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, 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 | 225gr | Sierra Pro-Hunter 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.