Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 250gr | Lehigh Defense Controlled Fracturing bullet and 88 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N560, Norma MRP 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 2700 | <<locked>> | 82% | 56,289 psi | 88% | 2546 fps | 99.7% |
| Accurate 3100 | <<locked>> | 98% | 55,347 psi | 87% | 2595 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 55,695 psi | 87% | 2520 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,334 psi | 90% | 2635 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 54,172 psi | 85% | 2687 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 84% | 55,854 psi | 88% | 2556 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,694 psi | 86% | 2635 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 98% | 56,057 psi | 88% | 2690 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 43,540 psi | 68% | 2480 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,319 psi | 60% | 2441 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,840 psi | 89% | 2575 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,985 psi | 89% | 2598 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 54,766 psi | 86% | 2638 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,970 psi | 88% | 2654 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,143 psi | 85% | 2625 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,419 psi | 87% | 2684 fps | 99.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,289 psi | 88% | 2654 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,486 psi | 76% | 2608 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,739 psi | 89% | 2743 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 54,868 psi | 86% | 2602 fps | 95.9% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,360 psi | 85% | 2667 fps | 99.4% |
| Bofors RP3 | <<locked>> | 82% | 53,998 psi | 85% | 2543 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 44,396 psi | 70% | 2543 fps | 97.5% |
| Bofors RP5 | <<locked>> | 98% | 55,419 psi | 87% | 2684 fps | 99.6% |
| Bofors RP7 | <<locked>> | 88% | 56,942 psi | 89% | 2589 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,022 psi | 75% | 2562 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 82% | 54,201 psi | 85% | 2562 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,637 psi | 87% | 2635 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 55,288 psi | 87% | 2602 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 96% | 56,028 psi | 88% | 2631 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,926 psi | 86% | 2618 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,969 psi | 86% | 2566 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,485 psi | 74% | 2657 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 88% | 56,275 psi | 88% | 2674 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,651 psi | 57% | 1604 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,274 psi | 87% | 2539 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,580 psi | 90% | 2575 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 54,781 psi | 86% | 2575 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,027 psi | 86% | 2566 fps | 99.9% |
| IMR 4831 | <<locked>> | 90% | 54,056 psi | 85% | 2579 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,363 psi | 90% | 2618 fps | 98.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,319 psi | 90% | 2717 fps | 99.1% |
| Lovex S062 | <<locked>> | 82% | 55,361 psi | 87% | 2530 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,361 psi | 87% | 2562 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,782 psi | 89% | 2602 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,240 psi | 77% | 2516 fps | 99.9% |
| Norma 203B | <<locked>> | 82% | 56,289 psi | 88% | 2585 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,550 psi | 87% | 2625 fps | 99.3% |
| Norma MRP | <<locked>> | 96% | 55,114 psi | 86% | 2703 fps | 100% |
| Norma URP | <<locked>> | 90% | 55,956 psi | 88% | 2621 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,348 psi | 90% | 2608 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 53,983 psi | 85% | 2680 fps | 99% |
| Ramshot Hunter | <<locked>> | 90% | 54,708 psi | 86% | 2625 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,141 psi | 82% | 2621 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,289 psi | 58% | 1640 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,172 psi | 85% | 2552 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,230 psi | 87% | 2641 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,537 psi | 90% | 2657 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,956 psi | 88% | 2687 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,747 psi | 75% | 2654 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 82% | 57,145 psi | 90% | 2536 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 54,288 psi | 85% | 2543 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,159 psi | 88% | 2608 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 96% | 57,217 psi | 90% | 2664 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 88% | 56,942 psi | 89% | 2589 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,361 psi | 87% | 2562 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,361 psi | 87% | 2530 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,782 psi | 89% | 2602 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,999 psi | 88% | 2598 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,027 psi | 86% | 2431 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,781 psi | 86% | 2520 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,753 psi | 89% | 2661 fps | 99.6% |
| Somchem S355 | <<locked>> | 86% | 57,566 psi | 90% | 2582 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,128 psi | 85% | 2549 fps | 97.9% |
| Somchem S365 | <<locked>> | 92% | 55,709 psi | 87% | 2618 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 57,551 psi | 90% | 2635 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 86% | 55,419 psi | 87% | 2513 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,244 psi | 85% | 2566 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,174 psi | 90% | 2618 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 82% | 56,086 psi | 88% | 2510 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,985 psi | 89% | 2618 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 54,839 psi | 86% | 2631 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,230 psi | 87% | 2700 fps | 98.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 50,662 psi | 79% | 2618 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 53,911 psi | 84% | 2533 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,854 psi | 88% | 2638 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 52,794 psi | 83% | 2726 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,056 psi | 85% | 2585 fps | 99.3% |
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% | 52,721 psi | 83% | 2497 fps | 99.5% |
| Accurate 3100 | <<locked>> | 80% | 29,573 psi | 46% | 2152 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 52,272 psi | 82% | 2477 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,393 psi | 63% | 2385 fps | 99.8% |
| Accurate MAGPRO | 79.2 gr | 90% | 43,540 psi | 68% | 2513 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 49,327 psi | 77% | 2467 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 36,564 psi | 57% | 2326 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 88% | 39,769 psi | 62% | 2415 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 98% | 40,611 psi | 64% | 2425 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 94% | 31,502 psi | 49% | 2277 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,951 psi | 78% | 2484 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,359 psi | 84% | 2549 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,262 psi | 62% | 2398 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,092 psi | 71% | 2507 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 36,477 psi | 57% | 2323 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 86% | 36,796 psi | 58% | 2369 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,718 psi | 45% | 2185 fps | 98.8% |
| Alliant Reloder-25 | <<locked>> | 84% | 28,689 psi | 45% | 2195 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 30,908 psi | 48% | 2293 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 51,648 psi | 81% | 2552 fps | 95.1% |
| Bofors RP15 | <<locked>> | 88% | 36,332 psi | 57% | 2359 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 50,415 psi | 79% | 2497 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 38,711 psi | 61% | 2438 fps | 95.7% |
| Bofors RP5 | <<locked>> | 86% | 36,796 psi | 58% | 2369 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 44,106 psi | 69% | 2398 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 94% | 39,044 psi | 61% | 2395 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 50,865 psi | 80% | 2516 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,409 psi | 66% | 2431 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 80% | 45,281 psi | 71% | 2448 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 88% | 42,612 psi | 67% | 2425 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 41,756 psi | 65% | 2408 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,840 psi | 58% | 2297 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 34,069 psi | 53% | 2372 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 41,524 psi | 65% | 2448 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 43% | 1434 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,880 psi | 81% | 2497 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,128 psi | 85% | 2530 fps | 99.9% |
| IMR 4350 | <<locked>> | 80% | 39,813 psi | 62% | 2336 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,585 psi | 71% | 2421 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 38,798 psi | 61% | 2343 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 41,771 psi | 65% | 2375 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 90% | 40,727 psi | 64% | 2444 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 52,011 psi | 82% | 2484 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,018 psi | 67% | 2375 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 41,234 psi | 65% | 2362 fps | 98.5% |
| Lovex S071 | <<locked>> | 84% | 29,066 psi | 46% | 2139 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 52,692 psi | 83% | 2536 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,392 psi | 62% | 2362 fps | 96.3% |
| Norma MRP | 69.1 gr | 80% | 31,082 psi | 49% | 2264 fps | 95% |
| Norma URP | <<locked>> | 80% | 40,161 psi | 63% | 2382 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 80% | 53,432 psi | 84% | 2559 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 40,393 psi | 63% | 2451 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 39,044 psi | 61% | 2375 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 88% | 33,286 psi | 52% | 2283 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,818 psi | 44% | 1467 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,763 psi | 80% | 2503 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,906 psi | 75% | 2546 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,408 psi | 63% | 2405 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,943 psi | 61% | 2418 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 33,257 psi | 52% | 2352 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 53,679 psi | 84% | 2493 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,514 psi | 74% | 2451 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 40,509 psi | 63% | 2356 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 82% | 35,563 psi | 56% | 2306 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 44,106 psi | 69% | 2398 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,018 psi | 67% | 2375 fps | 99.5% |
| Shooters World Precision | <<locked>> | 80% | 52,011 psi | 82% | 2484 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,234 psi | 65% | 2362 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,037 psi | 77% | 2503 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,443 psi | 76% | 2352 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,105 psi | 66% | 2329 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 35,244 psi | 55% | 2300 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 47,718 psi | 75% | 2448 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 44,179 psi | 69% | 2398 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 36,825 psi | 58% | 2343 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 33,649 psi | 53% | 2238 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 45,614 psi | 71% | 2382 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,568 psi | 65% | 2375 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 33,243 psi | 52% | 2224 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 52,750 psi | 83% | 2467 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,017 psi | 64% | 2382 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 31,937 psi | 50% | 2247 fps | 98.8% |
| Vihtavuori N560 | 76 gr | 88% | 41,713 psi | 65% | 2477 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 94% | 41,060 psi | 64% | 2457 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,741 psi | 64% | 2349 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,598 psi | 67% | 2434 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,280 psi | 40% | 2178 fps | 98.6% |
| Winchester Supreme 780 | <<locked>> | 84% | 35,288 psi | 55% | 2274 fps | 95.1% |
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 88 powders for .338 Rem. Ultra Mag. loaded with the .338 | 250gr | Lehigh Defense Controlled Fracturing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,743 fps; across all powders the maximum-charge window runs from 1,604 fps to 2,743 fps. ADI AR 2217 gives the best case fill at 100 %, and 88 of the 88 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 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, Norma MRP, Accurate MAGPRO rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 250gr | Lehigh Defense Controlled Fracturing 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.