Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 250gr | Barnes Banded Solid RN bullet and 79 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Winchester StaBALL HD and IMR 7828 SSC.
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 2700 | <<locked>> | 82% | 54,244 psi | 85% | 2523 fps | 99.8% |
| Accurate 3100 | <<locked>> | 96% | 56,884 psi | 89% | 2621 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 54,694 psi | 86% | 2605 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 56,173 psi | 88% | 2717 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 82% | 55,970 psi | 88% | 2569 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,405 psi | 87% | 2657 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 96% | 56,753 psi | 89% | 2710 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,630 psi | 75% | 2566 fps | 98.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,308 psi | 66% | 2533 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 55,564 psi | 87% | 2654 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,217 psi | 90% | 2585 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,448 psi | 87% | 2654 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 56,652 psi | 89% | 2667 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 54,868 psi | 86% | 2644 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 96% | 56,637 psi | 89% | 2707 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 98% | 57,740 psi | 90% | 2674 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,229 psi | 83% | 2684 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 54,418 psi | 85% | 2713 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 55,245 psi | 87% | 2625 fps | 96.5% |
| Bofors RP15 | <<locked>> | 98% | 55,579 psi | 87% | 2690 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 49,327 psi | 77% | 2631 fps | 98.7% |
| Bofors RP5 | <<locked>> | 96% | 56,637 psi | 89% | 2707 fps | 99.8% |
| Bofors RP7 | <<locked>> | 86% | 57,261 psi | 90% | 2605 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,504 psi | 82% | 2644 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 86% | 56,333 psi | 88% | 2654 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 55,463 psi | 87% | 2615 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 94% | 56,840 psi | 89% | 2654 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 94% | 55,782 psi | 87% | 2641 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 55,796 psi | 87% | 2582 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,301 psi | 82% | 2746 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 86% | 57,029 psi | 89% | 2694 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,072 psi | 58% | 1631 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,216 psi | 87% | 2592 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,288 psi | 87% | 2579 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 54,969 psi | 86% | 2595 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,404 psi | 85% | 2592 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 96% | 54,607 psi | 86% | 2694 fps | 99% |
| Lovex S065 | <<locked>> | 86% | 55,695 psi | 87% | 2575 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 57,421 psi | 90% | 2621 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,288 psi | 85% | 2589 fps | 100% |
| Norma 204 | <<locked>> | 88% | 56,072 psi | 88% | 2644 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 37,884 psi | 59% | 2464 fps | 98% |
| Norma MRP | <<locked>> | 94% | 56,478 psi | 89% | 2730 fps | 100% |
| Norma URP | <<locked>> | 88% | 56,739 psi | 89% | 2638 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,143 psi | 86% | 2707 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 88% | 55,492 psi | 87% | 2641 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 57,740 psi | 90% | 2703 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,753 psi | 59% | 1667 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,217 psi | 88% | 2654 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,650 psi | 86% | 2628 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 56,652 psi | 89% | 2700 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 52,881 psi | 83% | 2746 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 47,645 psi | 75% | 2635 fps | 97.1% |
| Rottweil R 903 | <<locked>> | 82% | 54,969 psi | 86% | 2556 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 56,768 psi | 89% | 2628 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 92% | 54,346 psi | 85% | 2635 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 86% | 57,261 psi | 90% | 2605 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,695 psi | 87% | 2575 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 57,421 psi | 90% | 2621 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,376 psi | 88% | 2608 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,013 psi | 86% | 2441 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,969 psi | 86% | 2533 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 57,508 psi | 90% | 2680 fps | 99.8% |
| Somchem S355 | <<locked>> | 82% | 54,650 psi | 86% | 2552 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 54,665 psi | 86% | 2569 fps | 98.3% |
| Somchem S365 | <<locked>> | 90% | 56,971 psi | 89% | 2635 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,926 psi | 86% | 2612 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 55,825 psi | 87% | 2526 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,998 psi | 86% | 2582 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 54,375 psi | 85% | 2592 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 86% | 54,128 psi | 85% | 2589 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 56,550 psi | 89% | 2654 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 56,333 psi | 88% | 2723 fps | 98.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 56,101 psi | 88% | 2703 fps | 99% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 49,023 psi | 77% | 2644 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,404 psi | 85% | 2543 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 56,536 psi | 89% | 2657 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 98% | 55,303 psi | 87% | 2753 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,926 psi | 86% | 2608 fps | 99.5% |
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% | 50,850 psi | 80% | 2474 fps | 99.5% |
| Accurate 3100 | <<locked>> | 80% | 33,141 psi | 52% | 2231 fps | 97.5% |
| Accurate 4350 | <<locked>> | 80% | 44,498 psi | 70% | 2457 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 45,411 psi | 71% | 2546 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 52,620 psi | 82% | 2523 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 37,289 psi | 58% | 2346 fps | 96.1% |
| ADI AR 2213 | <<locked>> | 86% | 40,582 psi | 64% | 2441 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 94% | 39,030 psi | 61% | 2405 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 90% | 30,705 psi | 48% | 2260 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 37,507 psi | 59% | 2349 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,780 psi | 84% | 2543 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,685 psi | 67% | 2464 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,313 psi | 77% | 2572 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 37,173 psi | 58% | 2343 fps | 96.1% |
| Alliant Reloder-22 | <<locked>> | 82% | 35,418 psi | 56% | 2343 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,807 psi | 50% | 2260 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 27,862 psi | 44% | 2175 fps | 95.8% |
| Alliant Reloder-26 | 75.2 gr | 80% | 34,621 psi | 54% | 2382 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 51,822 psi | 81% | 2572 fps | 95.7% |
| Bofors RP15 | <<locked>> | 84% | 35,128 psi | 55% | 2333 fps | 95.4% |
| Bofors RP30 | <<locked>> | 92% | 37,550 psi | 59% | 2418 fps | 95.7% |
| Bofors RP5 | <<locked>> | 82% | 35,418 psi | 56% | 2343 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 47,384 psi | 74% | 2461 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 90% | 37,289 psi | 58% | 2369 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 46,282 psi | 73% | 2503 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 48,834 psi | 77% | 2516 fps | 99% |
| Hodgdon H4831 | <<locked>> | 84% | 40,495 psi | 63% | 2392 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 42,569 psi | 67% | 2431 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,364 psi | 63% | 2362 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 32,982 psi | 52% | 2349 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 45,527 psi | 71% | 2523 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,760 psi | 44% | 1457 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,975 psi | 67% | 2402 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,805 psi | 76% | 2484 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 42,482 psi | 67% | 2411 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 39,726 psi | 62% | 2346 fps | 95% |
| IMR 7828 SSC | 75.5 gr | 86% | 38,957 psi | 61% | 2418 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 46,354 psi | 73% | 2441 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 44,744 psi | 70% | 2431 fps | 99.3% |
| Lovex S071 | <<locked>> | 80% | 28,558 psi | 45% | 2123 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 42,772 psi | 67% | 2434 fps | 97.6% |
| Norma 217 | <<locked>> | 94% | 31,082 psi | 49% | 2303 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 34,534 psi | 54% | 2349 fps | 96.9% |
| Norma URP | <<locked>> | 80% | 43,801 psi | 69% | 2448 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 38,609 psi | 61% | 2425 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 42,569 psi | 67% | 2444 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 84% | 32,010 psi | 50% | 2260 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,282 psi | 44% | 1490 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,359 psi | 82% | 2608 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,454 psi | 70% | 2477 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,685 psi | 67% | 2493 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 32,053 psi | 50% | 2326 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 41,060 psi | 64% | 2513 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 51,590 psi | 81% | 2513 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 38,537 psi | 60% | 2326 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 80% | 36,477 psi | 57% | 2329 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 80% | 47,384 psi | 74% | 2461 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,354 psi | 73% | 2441 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 44,744 psi | 70% | 2431 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,794 psi | 83% | 2562 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,648 psi | 81% | 2398 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,411 psi | 71% | 2395 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 36,143 psi | 57% | 2323 fps | 96% |
| Somchem S355 | <<locked>> | 80% | 51,343 psi | 80% | 2507 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 42,032 psi | 66% | 2369 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 40,727 psi | 64% | 2411 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,101 psi | 58% | 2316 fps | 97.2% |
| Vihtavuori N150 | <<locked>> | 80% | 49,226 psi | 77% | 2441 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,121 psi | 71% | 2441 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 34,301 psi | 54% | 2251 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 44,643 psi | 70% | 2448 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 35,766 psi | 56% | 2329 fps | 99.6% |
| Vihtavuori N560 | <<locked>> | 84% | 39,929 psi | 63% | 2448 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 90% | 39,885 psi | 63% | 2438 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 98% | 45,730 psi | 72% | 2589 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,295 psi | 69% | 2408 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,282 psi | 73% | 2503 fps | 99.4% |
| Winchester StaBALL HD | 72.2 gr | 80% | 28,224 psi | 44% | 2274 fps | 99.8% |
| Winchester Supreme 780 | <<locked>> | 82% | 36,201 psi | 57% | 2297 fps | 95.8% |
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 79 powders for .338 Rem. Ultra Mag. loaded with the .338 | 250gr | Barnes Banded Solid RN. Winchester StaBALL HD delivers the highest muzzle velocity at 2,753 fps; across all powders the maximum-charge window runs from 1,631 fps to 2,753 fps. ADI AR 2217 gives the best case fill at 100 %, and 79 of the 79 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:13.5 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. Alliant Reloder-26, Winchester StaBALL HD, IMR 7828 SSC rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 250gr | Barnes Banded Solid RN 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.