Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 250gr | Nosler Partition bullet and 77 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, IMR 7828 SSC 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 54,505 psi | 85% | 2595 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,767 psi | 87% | 2621 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 56,710 psi | 89% | 2736 fps | 98.6% |
| ADI AR 2208 | <<locked>> | 82% | 56,753 psi | 89% | 2582 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,492 psi | 89% | 2677 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 94% | 54,331 psi | 85% | 2680 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,573 psi | 76% | 2589 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,337 psi | 68% | 2556 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,724 psi | 89% | 2674 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 53,911 psi | 84% | 2635 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,115 psi | 88% | 2667 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,317 psi | 85% | 2680 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,463 psi | 87% | 2651 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,621 psi | 86% | 2703 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 55,796 psi | 87% | 2733 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 56,188 psi | 88% | 2644 fps | 96.9% |
| Bofors RP15 | <<locked>> | 98% | 56,956 psi | 89% | 2713 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,705 psi | 79% | 2654 fps | 99% |
| Bofors RP5 | <<locked>> | 94% | 54,317 psi | 85% | 2680 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 54,737 psi | 86% | 2575 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,708 psi | 84% | 2667 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 86% | 57,406 psi | 90% | 2674 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 56,579 psi | 89% | 2635 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 92% | 54,230 psi | 85% | 2625 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,942 psi | 89% | 2664 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,985 psi | 89% | 2598 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,621 psi | 84% | 2772 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 54,085 psi | 85% | 2657 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,014 psi | 58% | 1637 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,217 psi | 88% | 2612 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,173 psi | 88% | 2598 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 56,130 psi | 88% | 2615 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,303 psi | 87% | 2608 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 96% | 55,811 psi | 87% | 2713 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 38,943 psi | 61% | 2467 fps | 96.1% |
| Lovex S065 | <<locked>> | 86% | 56,782 psi | 89% | 2595 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 54,897 psi | 86% | 2592 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,550 psi | 87% | 2608 fps | 100% |
| Norma 204 | <<locked>> | 88% | 57,305 psi | 90% | 2667 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 39,015 psi | 61% | 2490 fps | 98.4% |
| Norma MRP | <<locked>> | 92% | 53,940 psi | 85% | 2697 fps | 100% |
| Norma URP | <<locked>> | 86% | 54,259 psi | 85% | 2608 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 56,579 psi | 89% | 2733 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 88% | 56,753 psi | 89% | 2664 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 54,926 psi | 86% | 2671 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,869 psi | 59% | 1677 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,392 psi | 90% | 2671 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,840 psi | 88% | 2644 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 53,954 psi | 85% | 2671 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,331 psi | 85% | 2769 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 49,226 psi | 77% | 2667 fps | 97.6% |
| Rottweil R 903 | <<locked>> | 82% | 56,057 psi | 88% | 2575 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 57,740 psi | 90% | 2648 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 92% | 55,651 psi | 87% | 2657 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 84% | 54,737 psi | 86% | 2575 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,782 psi | 89% | 2595 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 54,897 psi | 86% | 2592 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,551 psi | 90% | 2628 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,825 psi | 87% | 2454 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,014 psi | 88% | 2552 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,201 psi | 87% | 2654 fps | 99.7% |
| Somchem S355 | <<locked>> | 82% | 55,680 psi | 87% | 2569 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,695 psi | 87% | 2592 fps | 98.6% |
| Somchem S365 | <<locked>> | 88% | 54,607 psi | 86% | 2612 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,144 psi | 88% | 2631 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 56,782 psi | 89% | 2539 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,956 psi | 88% | 2598 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,506 psi | 87% | 2612 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 55,216 psi | 87% | 2605 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 57,725 psi | 90% | 2674 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 57,740 psi | 90% | 2746 fps | 99.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 57,435 psi | 90% | 2726 fps | 99.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 50,415 psi | 79% | 2671 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,579 psi | 87% | 2559 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 57,653 psi | 90% | 2674 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 98% | 57,058 psi | 89% | 2776 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,072 psi | 88% | 2628 fps | 99.7% |
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% | 33,968 psi | 53% | 2254 fps | 97.8% |
| Accurate 4350 | <<locked>> | 80% | 45,542 psi | 71% | 2477 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 42,859 psi | 67% | 2510 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 53,447 psi | 84% | 2539 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 37,971 psi | 60% | 2365 fps | 96.5% |
| ADI AR 2213 | <<locked>> | 84% | 38,783 psi | 61% | 2408 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 92% | 37,318 psi | 58% | 2372 fps | 95% |
| ADI AR 2225 | <<locked>> | 90% | 31,357 psi | 49% | 2283 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,511 psi | 68% | 2484 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,357 psi | 79% | 2589 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,000 psi | 60% | 2362 fps | 96.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 33,852 psi | 53% | 2310 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,503 psi | 51% | 2277 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,413 psi | 45% | 2198 fps | 96.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,476 psi | 56% | 2402 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 49,603 psi | 78% | 2543 fps | 95.3% |
| Bofors RP15 | <<locked>> | 84% | 35,926 psi | 56% | 2356 fps | 95.8% |
| Bofors RP30 | <<locked>> | 90% | 36,085 psi | 57% | 2388 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 33,852 psi | 53% | 2310 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 48,283 psi | 76% | 2480 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 35,679 psi | 56% | 2339 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 47,065 psi | 74% | 2520 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 49,748 psi | 78% | 2536 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 41,423 psi | 65% | 2415 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 84% | 40,669 psi | 64% | 2402 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,205 psi | 65% | 2379 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 33,765 psi | 53% | 2375 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 46,572 psi | 73% | 2543 fps | 99.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,731 psi | 43% | 1463 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,685 psi | 68% | 2418 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,516 psi | 78% | 2500 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 43,294 psi | 68% | 2428 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 40,480 psi | 63% | 2362 fps | 95.4% |
| IMR 7828 SSC | 77 gr | 86% | 39,856 psi | 62% | 2444 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 36,405 psi | 57% | 2411 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 47,123 psi | 74% | 2457 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 45,484 psi | 71% | 2448 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 29,240 psi | 46% | 2142 fps | 96.1% |
| Norma 204 | <<locked>> | 80% | 43,642 psi | 68% | 2454 fps | 97.9% |
| Norma 217 | <<locked>> | 94% | 31,937 psi | 50% | 2329 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 35,346 psi | 55% | 2372 fps | 97.3% |
| Norma URP | <<locked>> | 80% | 44,628 psi | 70% | 2467 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 36,854 psi | 58% | 2392 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 43,453 psi | 68% | 2464 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 32,779 psi | 51% | 2283 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,398 psi | 45% | 1499 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,534 psi | 84% | 2625 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,426 psi | 71% | 2497 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,540 psi | 68% | 2513 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 30,589 psi | 48% | 2290 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 42,279 psi | 66% | 2543 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 52,460 psi | 82% | 2526 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 39,392 psi | 62% | 2349 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 37,217 psi | 58% | 2346 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 80% | 48,283 psi | 76% | 2480 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,123 psi | 74% | 2457 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 45,484 psi | 71% | 2448 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,780 psi | 84% | 2579 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,504 psi | 82% | 2415 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,093 psi | 72% | 2408 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 36,883 psi | 58% | 2343 fps | 96.3% |
| Somchem S355 | <<locked>> | 80% | 52,214 psi | 82% | 2523 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 39,943 psi | 63% | 2336 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 41,611 psi | 65% | 2425 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,942 psi | 59% | 2336 fps | 97.5% |
| Vihtavuori N150 | <<locked>> | 80% | 50,038 psi | 78% | 2454 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,079 psi | 72% | 2461 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 32,779 psi | 51% | 2221 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 45,382 psi | 71% | 2464 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 36,550 psi | 57% | 2346 fps | 99.8% |
| Vihtavuori N560 | 78.1 gr | 84% | 40,857 psi | 64% | 2470 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 88% | 38,145 psi | 60% | 2405 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 96% | 43,685 psi | 68% | 2556 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,092 psi | 71% | 2425 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,239 psi | 74% | 2523 fps | 99.6% |
| Winchester StaBALL HD | 73.6 gr | 80% | 28,906 psi | 45% | 2297 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 34,505 psi | 54% | 2264 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 | 250gr | Nosler Partition. Winchester StaBALL HD delivers the highest muzzle velocity at 2,776 fps; across all powders the maximum-charge window runs from 1,637 fps to 2,776 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 58–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:15.0 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. Winchester StaBALL HD, IMR 7828 SSC, Vihtavuori N560 rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 250gr | Nosler Partition they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.