Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 240gr | NorthFork Bonded Core bullet and 91 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country and Norma MRP.
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% | 54,969 psi | 86% | 2562 fps | 99.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 57,580 psi | 90% | 2661 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 54,723 psi | 86% | 2546 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,796 psi | 87% | 2654 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 54,897 psi | 86% | 2749 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 98% | 55,927 psi | 88% | 2749 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 84% | 54,563 psi | 86% | 2579 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,536 psi | 89% | 2697 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 98% | 54,114 psi | 85% | 2694 fps | 98.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,304 psi | 58% | 2444 fps | 97.2% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 56,608 psi | 89% | 2694 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,506 psi | 87% | 2598 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,680 psi | 87% | 2621 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,318 psi | 88% | 2700 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 53,867 psi | 84% | 2674 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,840 psi | 88% | 2687 fps | 99.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,246 psi | 90% | 2746 fps | 99.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,070 psi | 85% | 2671 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,804 psi | 73% | 2618 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,360 psi | 85% | 2756 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,388 psi | 82% | 2677 fps | 98.9% |
| Bofors RP3 | <<locked>> | 84% | 56,347 psi | 88% | 2612 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 42,830 psi | 67% | 2549 fps | 96.4% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,246 psi | 90% | 2746 fps | 99.5% |
| Bofors RP7 | <<locked>> | 88% | 55,593 psi | 87% | 2608 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,543 psi | 73% | 2566 fps | 97.3% |
| Hodgdon H380 | <<locked>> | 84% | 56,710 psi | 89% | 2635 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 54,056 psi | 85% | 2651 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 88% | 57,174 psi | 90% | 2664 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 96% | 54,331 psi | 85% | 2644 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,811 psi | 89% | 2677 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,724 psi | 89% | 2628 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,890 psi | 72% | 2661 fps | 98.6% |
| Hodgdon Superformance | <<locked>> | 88% | 54,186 psi | 85% | 2687 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,622 psi | 57% | 1627 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,464 psi | 90% | 2605 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,333 psi | 88% | 2595 fps | 99.8% |
| IMR 4350 | <<locked>> | 92% | 56,768 psi | 89% | 2638 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,203 psi | 90% | 2631 fps | 99.8% |
| IMR 4831 | <<locked>> | 92% | 56,086 psi | 88% | 2644 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,145 psi | 90% | 2644 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,796 psi | 87% | 2631 fps | 97.9% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,259 psi | 87% | 2726 fps | 98.4% |
| Lovex S062 | <<locked>> | 84% | 57,624 psi | 90% | 2598 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,479 psi | 90% | 2625 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 55,463 psi | 87% | 2621 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,892 psi | 75% | 2530 fps | 99.6% |
| Norma 203B | <<locked>> | 82% | 54,984 psi | 86% | 2608 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,653 psi | 90% | 2690 fps | 99.2% |
| Norma MRP | <<locked>> | 98% | 56,898 psi | 89% | 2769 fps | 99.9% |
| Norma URP | <<locked>> | 90% | 54,375 psi | 85% | 2638 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,724 psi | 87% | 2628 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,927 psi | 88% | 2743 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 92% | 56,637 psi | 89% | 2690 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,082 psi | 78% | 2628 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,289 psi | 58% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,376 psi | 88% | 2618 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 57,217 psi | 90% | 2710 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,695 psi | 87% | 2674 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 53,853 psi | 84% | 2700 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,064 psi | 72% | 2657 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 82% | 56,231 psi | 88% | 2562 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,434 psi | 88% | 2608 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,491 psi | 85% | 2618 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 96% | 55,158 psi | 86% | 2674 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 88% | 55,593 psi | 87% | 2608 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,479 psi | 90% | 2625 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,624 psi | 90% | 2598 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,463 psi | 87% | 2621 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,433 psi | 85% | 2618 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,087 psi | 89% | 2497 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,029 psi | 89% | 2582 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,694 psi | 86% | 2671 fps | 99.2% |
| Somchem S355 | <<locked>> | 86% | 56,376 psi | 88% | 2605 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,304 psi | 88% | 2612 fps | 97.7% |
| Somchem S365 | <<locked>> | 94% | 57,638 psi | 90% | 2684 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,912 psi | 88% | 2651 fps | 99.6% |
| Vihtavuori N135 | <<locked>> | 82% | 56,550 psi | 89% | 2520 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,666 psi | 89% | 2536 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 54,027 psi | 85% | 2536 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,420 psi | 88% | 2631 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,259 psi | 87% | 2628 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 82% | 54,897 psi | 86% | 2536 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,376 psi | 87% | 2638 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,681 psi | 89% | 2697 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,985 psi | 89% | 2762 fps | 98.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 48,921 psi | 77% | 2628 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,869 psi | 88% | 2595 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,273 psi | 85% | 2654 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,734 psi | 78% | 2740 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,057 psi | 88% | 2648 fps | 99.2% |
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% | 51,648 psi | 81% | 2516 fps | 99% |
| Accurate 3100 | <<locked>> | 82% | 31,270 psi | 49% | 2221 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 51,372 psi | 81% | 2503 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,523 psi | 62% | 2405 fps | 99.4% |
| Accurate High Country | 74.6 gr | 88% | 41,437 psi | 65% | 2523 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 92% | 45,179 psi | 71% | 2579 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 48,138 psi | 75% | 2487 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 38,159 psi | 60% | 2388 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 92% | 44,353 psi | 70% | 2533 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 96% | 32,953 psi | 52% | 2336 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 38,392 psi | 60% | 2392 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,950 psi | 77% | 2510 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,112 psi | 82% | 2572 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,218 psi | 60% | 2411 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,598 psi | 68% | 2523 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 38,014 psi | 60% | 2385 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 88% | 38,218 psi | 60% | 2431 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,195 psi | 44% | 2198 fps | 98.2% |
| Alliant Reloder-25 | <<locked>> | 86% | 29,979 psi | 47% | 2257 fps | 95.8% |
| Alliant Reloder-26 | 69.9 gr | 80% | 30,197 psi | 47% | 2306 fps | 96.9% |
| Bofors RP15 | <<locked>> | 90% | 37,898 psi | 59% | 2421 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 49,356 psi | 77% | 2520 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 40,132 psi | 63% | 2497 fps | 95.5% |
| Bofors RP5 | <<locked>> | 88% | 38,218 psi | 60% | 2431 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 43,207 psi | 68% | 2411 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 96% | 40,611 psi | 64% | 2454 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 49,588 psi | 78% | 2533 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 41,394 psi | 65% | 2448 fps | 98% |
| Hodgdon H4350 | <<locked>> | 80% | 44,208 psi | 69% | 2461 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 90% | 44,309 psi | 69% | 2484 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 46,485 psi | 73% | 2523 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,882 psi | 56% | 2313 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 94% | 37,782 psi | 59% | 2487 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 40,379 psi | 63% | 2461 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,354 psi | 43% | 1453 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,647 psi | 79% | 2516 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,939 psi | 83% | 2546 fps | 99.6% |
| IMR 4350 | <<locked>> | 80% | 38,928 psi | 61% | 2352 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,556 psi | 70% | 2438 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 37,898 psi | 59% | 2359 fps | 99.2% |
| IMR 4895 | <<locked>> | 80% | 53,476 psi | 84% | 2595 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 43,381 psi | 68% | 2434 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 92% | 42,351 psi | 66% | 2507 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 51,097 psi | 80% | 2513 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,192 psi | 66% | 2395 fps | 99% |
| Lovex S070 | <<locked>> | 80% | 40,437 psi | 63% | 2379 fps | 97.9% |
| Lovex S071 | <<locked>> | 86% | 30,530 psi | 48% | 2201 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 51,474 psi | 81% | 2559 fps | 100% |
| Norma 204 | <<locked>> | 80% | 38,319 psi | 60% | 2372 fps | 95.3% |
| Norma MRP | 69.5 gr | 82% | 32,561 psi | 51% | 2329 fps | 95% |
| Norma URP | <<locked>> | 80% | 39,146 psi | 61% | 2398 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 80% | 52,156 psi | 82% | 2582 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 42,076 psi | 66% | 2513 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 37,956 psi | 59% | 2388 fps | 97.9% |
| Ramshot Magnum | <<locked>> | 90% | 34,824 psi | 55% | 2346 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,847 psi | 44% | 1490 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,472 psi | 78% | 2520 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,282 psi | 73% | 2566 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,276 psi | 62% | 2421 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,029 psi | 60% | 2431 fps | 98.9% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,795 psi | 55% | 2415 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 52,808 psi | 83% | 2520 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,485 psi | 73% | 2474 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 42,235 psi | 66% | 2421 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 84% | 37,130 psi | 58% | 2369 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 43,207 psi | 68% | 2411 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,192 psi | 66% | 2395 fps | 99% |
| Shooters World Precision | <<locked>> | 80% | 51,097 psi | 80% | 2513 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,437 psi | 63% | 2379 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,616 psi | 75% | 2523 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,500 psi | 74% | 2379 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,379 psi | 65% | 2346 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 36,782 psi | 58% | 2365 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 46,659 psi | 73% | 2470 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 46,137 psi | 72% | 2461 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 35,737 psi | 56% | 2362 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 35,346 psi | 55% | 2306 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 53,214 psi | 83% | 2480 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,229 psi | 83% | 2493 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,614 psi | 70% | 2405 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,553 psi | 64% | 2395 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 88% | 37,072 psi | 58% | 2333 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 51,459 psi | 81% | 2490 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,958 psi | 63% | 2395 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 31,357 psi | 49% | 2270 fps | 98.2% |
| Vihtavuori N560 | <<locked>> | 90% | 43,308 psi | 68% | 2539 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 96% | 42,714 psi | 67% | 2520 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,668 psi | 62% | 2365 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,539 psi | 65% | 2451 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,903 psi | 39% | 2185 fps | 97.6% |
| Winchester Supreme 780 | <<locked>> | 86% | 36,912 psi | 58% | 2336 fps | 95% |
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 91 powders for .338 Rem. Ultra Mag. loaded with the .338 | 240gr | NorthFork Bonded Core. Norma MRP delivers the highest muzzle velocity at 2,769 fps; across all powders the maximum-charge window runs from 1,627 fps to 2,769 fps. Accurate 3100 gives the best case fill at 100 %, and 91 of the 91 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 240.0 gr projectile in 0.338" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2225, Alliant Reloder-22 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, Accurate High Country, Norma MRP rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 240gr | NorthFork Bonded Core 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.