Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 250gr | Target Virtus bullet and 90 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N560, Accurate MAGPRO and Accurate High Country.
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.
A valid access license is required to use the Personalized Load Calculator.
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% | 56,797 psi | 89% | 2556 fps | 99.8% |
| Accurate 3100 | <<locked>> | 98% | 55,854 psi | 88% | 2605 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 56,072 psi | 88% | 2523 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 53,954 psi | 85% | 2592 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 53,664 psi | 84% | 2694 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 96% | 54,592 psi | 86% | 2694 fps | 98% |
| ADI AR 2208 | <<locked>> | 84% | 56,188 psi | 88% | 2562 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 55,172 psi | 86% | 2644 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 98% | 56,463 psi | 88% | 2700 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 43,888 psi | 69% | 2490 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,769 psi | 61% | 2454 fps | 98.5% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,317 psi | 87% | 2641 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,317 psi | 87% | 2641 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,174 psi | 90% | 2582 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,348 psi | 90% | 2605 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 55,114 psi | 86% | 2644 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 56,289 psi | 88% | 2661 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,549 psi | 85% | 2635 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,912 psi | 88% | 2694 fps | 99.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,811 psi | 89% | 2661 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,110 psi | 77% | 2621 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 57,479 psi | 90% | 2753 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 55,361 psi | 87% | 2612 fps | 96.1% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,795 psi | 86% | 2677 fps | 99.5% |
| Bofors RP3 | <<locked>> | 82% | 54,346 psi | 85% | 2549 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 44,817 psi | 70% | 2552 fps | 97.6% |
| Bofors RP5 | <<locked>> | 98% | 55,912 psi | 88% | 2694 fps | 99.6% |
| Bofors RP7 | <<locked>> | 88% | 57,217 psi | 90% | 2595 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,370 psi | 76% | 2569 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 82% | 54,737 psi | 86% | 2569 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,144 psi | 88% | 2644 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 55,579 psi | 87% | 2608 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 96% | 56,739 psi | 89% | 2644 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,347 psi | 87% | 2625 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,288 psi | 87% | 2572 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,051 psi | 75% | 2671 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 88% | 56,753 psi | 89% | 2684 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,651 psi | 57% | 1608 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,622 psi | 87% | 2546 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,259 psi | 87% | 2585 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,521 psi | 87% | 2575 fps | 99.9% |
| IMR 4831 | <<locked>> | 90% | 54,549 psi | 85% | 2589 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 54,360 psi | 85% | 2579 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 98% | 54,056 psi | 85% | 2674 fps | 98.7% |
| Lovex S062 | <<locked>> | 82% | 55,724 psi | 87% | 2536 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,637 psi | 87% | 2569 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 57,043 psi | 89% | 2608 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,719 psi | 78% | 2523 fps | 99.9% |
| Norma 203B | <<locked>> | 82% | 56,652 psi | 89% | 2589 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,043 psi | 88% | 2635 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 34,011 psi | 53% | 2375 fps | 96.2% |
| Norma MRP | <<locked>> | 96% | 55,854 psi | 88% | 2717 fps | 100% |
| Norma URP | <<locked>> | 90% | 56,260 psi | 88% | 2625 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,650 psi | 86% | 2694 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 90% | 55,201 psi | 87% | 2635 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,504 psi | 82% | 2631 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,289 psi | 58% | 1644 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,491 psi | 85% | 2559 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,883 psi | 88% | 2648 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 54,012 psi | 85% | 2615 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,449 psi | 88% | 2694 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,312 psi | 76% | 2667 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 82% | 57,522 psi | 90% | 2543 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 54,650 psi | 86% | 2549 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,623 psi | 89% | 2615 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 96% | 57,711 psi | 90% | 2674 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 88% | 57,217 psi | 90% | 2595 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,637 psi | 87% | 2569 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,724 psi | 87% | 2536 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,043 psi | 89% | 2608 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,318 psi | 88% | 2605 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,376 psi | 87% | 2438 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,245 psi | 87% | 2530 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 57,246 psi | 90% | 2671 fps | 99.7% |
| Somchem S355 | <<locked>> | 84% | 54,447 psi | 85% | 2543 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,505 psi | 85% | 2559 fps | 98% |
| Somchem S365 | <<locked>> | 92% | 56,289 psi | 88% | 2625 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 54,462 psi | 85% | 2598 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 86% | 55,738 psi | 87% | 2520 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,766 psi | 86% | 2572 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,580 psi | 90% | 2625 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 82% | 56,594 psi | 89% | 2516 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,493 psi | 90% | 2625 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 55,376 psi | 87% | 2638 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,912 psi | 88% | 2713 fps | 98.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 51,285 psi | 80% | 2631 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 54,360 psi | 85% | 2539 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,362 psi | 88% | 2648 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 53,374 psi | 84% | 2736 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,462 psi | 85% | 2595 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 2700 | <<locked>> | 80% | 52,997 psi | 83% | 2503 fps | 99.5% |
| Accurate 3100 | <<locked>> | 80% | 29,849 psi | 47% | 2159 fps | 96% |
| Accurate 4064 | <<locked>> | 80% | 52,678 psi | 83% | 2484 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,741 psi | 64% | 2395 fps | 99.8% |
| Accurate High Country | 74.8 gr | 86% | 40,277 psi | 63% | 2467 fps | 95.9% |
| Accurate MAGPRO | 79.8 gr | 90% | 43,961 psi | 69% | 2523 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 49,661 psi | 78% | 2474 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 36,811 psi | 58% | 2333 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 88% | 40,176 psi | 63% | 2425 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 98% | 40,959 psi | 64% | 2434 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 94% | 31,792 psi | 50% | 2287 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 37,101 psi | 58% | 2336 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 37,101 psi | 58% | 2336 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,299 psi | 79% | 2490 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,708 psi | 84% | 2556 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,595 psi | 62% | 2408 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,455 psi | 71% | 2513 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 36,738 psi | 58% | 2329 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 84% | 34,577 psi | 54% | 2323 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,979 psi | 45% | 2192 fps | 99% |
| Alliant Reloder-25 | <<locked>> | 84% | 28,921 psi | 45% | 2205 fps | 96.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 31,169 psi | 49% | 2300 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 51,938 psi | 81% | 2559 fps | 95.3% |
| Bofors RP15 | <<locked>> | 88% | 36,738 psi | 58% | 2369 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 50,995 psi | 80% | 2507 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 39,088 psi | 61% | 2448 fps | 95.9% |
| Bofors RP5 | <<locked>> | 84% | 34,577 psi | 54% | 2323 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 44,425 psi | 70% | 2405 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 94% | 39,378 psi | 62% | 2408 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 51,213 psi | 80% | 2523 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,917 psi | 67% | 2441 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 80% | 45,788 psi | 72% | 2457 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 88% | 43,033 psi | 67% | 2431 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 42,148 psi | 66% | 2418 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,028 psi | 58% | 2300 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 34,389 psi | 54% | 2382 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 41,974 psi | 66% | 2457 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,398 psi | 43% | 1437 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,243 psi | 82% | 2503 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,103 psi | 63% | 2343 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,890 psi | 72% | 2431 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 39,117 psi | 61% | 2352 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 42,032 psi | 66% | 2382 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 90% | 41,147 psi | 64% | 2457 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 52,359 psi | 82% | 2493 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,337 psi | 68% | 2385 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 41,539 psi | 65% | 2372 fps | 98.6% |
| Lovex S071 | <<locked>> | 84% | 29,356 psi | 46% | 2146 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 53,040 psi | 83% | 2543 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,697 psi | 62% | 2372 fps | 96.4% |
| Norma 217 | <<locked>> | 98% | 31,894 psi | 50% | 2323 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 31,357 psi | 49% | 2270 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 40,495 psi | 63% | 2388 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 38,014 psi | 60% | 2405 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 39,334 psi | 62% | 2382 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 88% | 33,634 psi | 53% | 2293 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,876 psi | 44% | 1473 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,039 psi | 80% | 2510 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,298 psi | 76% | 2552 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,741 psi | 64% | 2415 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,363 psi | 62% | 2428 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 31,241 psi | 49% | 2300 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 54,070 psi | 85% | 2500 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,877 psi | 75% | 2457 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 40,973 psi | 64% | 2369 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 82% | 35,882 psi | 56% | 2313 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 44,425 psi | 70% | 2405 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,337 psi | 68% | 2385 fps | 99.5% |
| Shooters World Precision | <<locked>> | 80% | 52,359 psi | 82% | 2493 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,539 psi | 65% | 2372 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,356 psi | 77% | 2510 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,805 psi | 76% | 2359 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,409 psi | 66% | 2336 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 35,563 psi | 56% | 2310 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 48,080 psi | 75% | 2457 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 41,611 psi | 65% | 2356 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 37,173 psi | 58% | 2349 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,055 psi | 53% | 2247 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 45,948 psi | 72% | 2392 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,901 psi | 66% | 2385 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 33,649 psi | 53% | 2234 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 53,069 psi | 83% | 2474 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,307 psi | 65% | 2388 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 32,256 psi | 51% | 2257 fps | 98.9% |
| Vihtavuori N560 | 76.6 gr | 88% | 42,148 psi | 66% | 2487 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 94% | 41,481 psi | 65% | 2467 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,988 psi | 64% | 2352 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,917 psi | 67% | 2441 fps | 98.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,498 psi | 40% | 2185 fps | 98.8% |
| Winchester Supreme 780 | <<locked>> | 84% | 35,708 psi | 56% | 2283 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 90 powders for .338 Rem. Ultra Mag. loaded with the .338 | 250gr | Target Virtus. Alliant Reloder-26 delivers the highest muzzle velocity at 2,753 fps; across all powders the maximum-charge window runs from 1,608 fps to 2,753 fps. ADI AR 2217 gives the best case fill at 100 %, and 90 of the 90 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, 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. Vihtavuori N560, Accurate MAGPRO, Accurate High Country rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 250gr | Target Virtus 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.