Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 225gr | Swift A-Frame bullet and 81 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 Accurate MAGPRO.
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% | 55,274 psi | 87% | 2736 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 56,695 psi | 89% | 2769 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 57,595 psi | 90% | 2877 fps | 98% |
| ADI AR 2208 | <<locked>> | 82% | 54,578 psi | 86% | 2687 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,435 psi | 90% | 2818 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 96% | 55,187 psi | 86% | 2822 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,122 psi | 72% | 2657 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,988 psi | 64% | 2621 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,796 psi | 87% | 2710 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,450 psi | 90% | 2825 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,897 psi | 86% | 2785 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,913 psi | 89% | 2808 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,897 psi | 86% | 2818 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,825 psi | 87% | 2792 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,590 psi | 81% | 2792 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,463 psi | 88% | 2877 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 57,464 psi | 90% | 2782 fps | 96.1% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,508 psi | 90% | 2851 fps | 99.5% |
| Bofors RP3 | <<locked>> | 82% | 56,797 psi | 89% | 2726 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,558 psi | 75% | 2726 fps | 97.7% |
| Bofors RP5 | <<locked>> | 96% | 54,897 psi | 86% | 2818 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 55,796 psi | 87% | 2720 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,850 psi | 80% | 2743 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 82% | 56,826 psi | 89% | 2746 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,708 psi | 86% | 2769 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 86% | 57,566 psi | 90% | 2782 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 94% | 55,216 psi | 87% | 2762 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,230 psi | 85% | 2749 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 57,725 psi | 90% | 2746 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,531 psi | 79% | 2848 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 86% | 55,259 psi | 87% | 2805 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,782 psi | 58% | 1729 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,450 psi | 90% | 2720 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,261 psi | 90% | 2756 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,246 psi | 90% | 2743 fps | 99.9% |
| IMR 4831 | <<locked>> | 90% | 57,000 psi | 89% | 2759 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,376 psi | 88% | 2749 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 98% | 56,710 psi | 89% | 2854 fps | 98.8% |
| Lovex S062 | <<locked>> | 82% | 57,740 psi | 90% | 2707 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,740 psi | 90% | 2740 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,854 psi | 88% | 2736 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,489 psi | 82% | 2697 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 54,505 psi | 85% | 2753 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 36,477 psi | 57% | 2546 fps | 96.5% |
| Norma MRP | <<locked>> | 94% | 54,781 psi | 86% | 2841 fps | 99.9% |
| Norma URP | <<locked>> | 88% | 55,071 psi | 86% | 2756 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 57,464 psi | 90% | 2874 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 90% | 57,580 psi | 90% | 2808 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,709 psi | 87% | 2808 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,550 psi | 59% | 1768 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,565 psi | 89% | 2730 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,360 psi | 85% | 2776 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,739 psi | 89% | 2792 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,984 psi | 86% | 2818 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,126 psi | 80% | 2848 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 84% | 57,043 psi | 89% | 2723 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,216 psi | 87% | 2740 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 94% | 56,478 psi | 89% | 2799 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 86% | 55,796 psi | 87% | 2720 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,740 psi | 90% | 2740 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,740 psi | 90% | 2707 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,854 psi | 88% | 2736 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,969 psi | 86% | 2730 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,000 psi | 89% | 2602 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,334 psi | 90% | 2697 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,014 psi | 88% | 2795 fps | 99.4% |
| Somchem S355 | <<locked>> | 84% | 56,782 psi | 89% | 2720 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,942 psi | 89% | 2730 fps | 98% |
| Somchem S365 | <<locked>> | 90% | 55,230 psi | 87% | 2756 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,072 psi | 89% | 2772 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 54,462 psi | 85% | 2644 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,014 psi | 89% | 2746 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,449 psi | 88% | 2749 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 88% | 56,289 psi | 88% | 2753 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,636 psi | 86% | 2769 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,737 psi | 86% | 2831 fps | 98.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,230 psi | 85% | 2808 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,768 psi | 89% | 2710 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,897 psi | 86% | 2769 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 57,130 psi | 90% | 2920 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,174 psi | 90% | 2769 fps | 99.4% |
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% | 32,024 psi | 50% | 2320 fps | 96.1% |
| Accurate 4350 | <<locked>> | 80% | 43,163 psi | 68% | 2566 fps | 99.8% |
| Accurate MAGPRO | 87.9 gr | 90% | 46,601 psi | 73% | 2697 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 51,271 psi | 80% | 2641 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 38,609 psi | 61% | 2493 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 88% | 42,134 psi | 66% | 2589 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 98% | 43,149 psi | 68% | 2598 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 94% | 33,808 psi | 53% | 2448 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,388 psi | 82% | 2664 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,249 psi | 65% | 2569 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,688 psi | 75% | 2684 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 38,537 psi | 60% | 2490 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 84% | 36,622 psi | 57% | 2487 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,734 psi | 48% | 2349 fps | 99% |
| Alliant Reloder-25 | <<locked>> | 82% | 28,718 psi | 45% | 2303 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,330 psi | 52% | 2467 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 53,896 psi | 84% | 2726 fps | 95.3% |
| Bofors RP15 | <<locked>> | 88% | 38,754 psi | 61% | 2530 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 53,243 psi | 83% | 2677 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 38,754 psi | 61% | 2559 fps | 95% |
| Bofors RP5 | <<locked>> | 84% | 36,622 psi | 57% | 2487 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 46,195 psi | 72% | 2569 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 94% | 41,481 psi | 65% | 2572 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 53,345 psi | 84% | 2697 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,860 psi | 70% | 2608 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 80% | 47,529 psi | 74% | 2625 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 88% | 44,976 psi | 70% | 2595 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 88% | 44,208 psi | 69% | 2582 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,015 psi | 61% | 2464 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 36,347 psi | 57% | 2546 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 44,019 psi | 69% | 2621 fps | 98.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,630 psi | 43% | 1549 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,969 psi | 85% | 2671 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,800 psi | 66% | 2503 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,572 psi | 75% | 2595 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 41,147 psi | 64% | 2516 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 43,801 psi | 69% | 2543 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 90% | 43,149 psi | 68% | 2621 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 54,447 psi | 85% | 2664 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 45,208 psi | 71% | 2549 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 43,482 psi | 68% | 2536 fps | 98.6% |
| Lovex S071 | <<locked>> | 84% | 31,314 psi | 49% | 2300 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 41,611 psi | 65% | 2533 fps | 96.4% |
| Norma 217 | <<locked>> | 98% | 34,142 psi | 54% | 2487 fps | 95.4% |
| Norma MRP | 76.7 gr | 80% | 33,359 psi | 52% | 2434 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 42,467 psi | 67% | 2556 fps | 99.7% |
| Ramshot Grand | <<locked>> | 88% | 40,001 psi | 63% | 2569 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 41,307 psi | 65% | 2546 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 88% | 35,723 psi | 56% | 2457 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,108 psi | 44% | 1585 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,968 psi | 83% | 2677 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,604 psi | 79% | 2726 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,004 psi | 67% | 2582 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,365 psi | 65% | 2595 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 33,330 psi | 52% | 2464 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 50,154 psi | 79% | 2628 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 42,612 psi | 67% | 2526 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 82% | 37,710 psi | 59% | 2474 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 46,195 psi | 72% | 2569 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,208 psi | 71% | 2549 fps | 99.5% |
| Shooters World Precision | <<locked>> | 80% | 54,447 psi | 85% | 2664 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,482 psi | 68% | 2536 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,459 psi | 81% | 2684 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,517 psi | 79% | 2520 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,135 psi | 69% | 2497 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 37,376 psi | 59% | 2467 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 50,067 psi | 78% | 2625 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 43,642 psi | 68% | 2516 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 39,233 psi | 61% | 2513 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,969 psi | 56% | 2408 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 47,906 psi | 75% | 2556 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,888 psi | 69% | 2549 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 35,418 psi | 56% | 2388 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 43,323 psi | 68% | 2552 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 34,330 psi | 54% | 2418 fps | 98.9% |
| Vihtavuori N560 | 84.3 gr | 88% | 44,338 psi | 69% | 2654 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 92% | 41,263 psi | 65% | 2582 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,830 psi | 67% | 2513 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,005 psi | 71% | 2612 fps | 98.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,282 psi | 43% | 2349 fps | 98.9% |
| Winchester Supreme 780 | <<locked>> | 84% | 37,579 psi | 59% | 2441 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 81 powders for .338 Rem. Ultra Mag. loaded with the .338 | 225gr | Swift A-Frame. Winchester StaBALL HD delivers the highest muzzle velocity at 2,920 fps; across all powders the maximum-charge window runs from 1,729 fps to 2,920 fps. ADI AR 2217 gives the best case fill at 100 %, and 81 of the 81 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 1:16.5 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, Accurate MAGPRO rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 225gr | Swift A-Frame 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.