Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 252gr | CutEdge MTH 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 Alliant Reloder-26.
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>> | 84% | 54,143 psi | 85% | 2500 fps | 99.6% |
| Accurate 3100 | <<locked>> | 98% | 55,419 psi | 87% | 2585 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 55,564 psi | 87% | 2507 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,290 psi | 90% | 2621 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 54,650 psi | 86% | 2677 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 84% | 55,724 psi | 87% | 2543 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,708 psi | 86% | 2628 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 98% | 55,854 psi | 88% | 2677 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 43,410 psi | 68% | 2467 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,363 psi | 60% | 2431 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,724 psi | 89% | 2562 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,869 psi | 89% | 2585 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 54,694 psi | 86% | 2628 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,898 psi | 88% | 2641 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 57,624 psi | 90% | 2664 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,274 psi | 87% | 2671 fps | 99.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,086 psi | 88% | 2641 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,544 psi | 76% | 2598 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,579 psi | 89% | 2730 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 54,766 psi | 86% | 2589 fps | 96% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,157 psi | 85% | 2654 fps | 99.4% |
| Bofors RP3 | <<locked>> | 84% | 57,696 psi | 90% | 2579 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 44,266 psi | 69% | 2533 fps | 97.5% |
| Bofors RP5 | <<locked>> | 98% | 55,274 psi | 87% | 2671 fps | 99.6% |
| Bofors RP7 | <<locked>> | 88% | 56,855 psi | 89% | 2579 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,906 psi | 75% | 2549 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 82% | 54,302 psi | 85% | 2552 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,608 psi | 87% | 2625 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 55,216 psi | 87% | 2589 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 96% | 56,101 psi | 88% | 2625 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,969 psi | 86% | 2608 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,926 psi | 86% | 2552 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,543 psi | 75% | 2648 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 88% | 56,101 psi | 88% | 2661 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,637 psi | 57% | 1598 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,114 psi | 86% | 2526 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,653 psi | 90% | 2566 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 54,752 psi | 86% | 2566 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,143 psi | 86% | 2556 fps | 99.9% |
| IMR 4831 | <<locked>> | 92% | 57,580 psi | 90% | 2612 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,392 psi | 90% | 2608 fps | 98.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,406 psi | 90% | 2710 fps | 99.2% |
| Lovex S062 | <<locked>> | 82% | 55,448 psi | 87% | 2520 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,274 psi | 87% | 2549 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,739 psi | 89% | 2592 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,052 psi | 77% | 2500 fps | 99.9% |
| Norma 203B | <<locked>> | 82% | 56,159 psi | 88% | 2569 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,564 psi | 87% | 2615 fps | 99.4% |
| Norma MRP | <<locked>> | 96% | 55,201 psi | 87% | 2694 fps | 100% |
| Norma URP | <<locked>> | 90% | 55,898 psi | 88% | 2608 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,276 psi | 90% | 2595 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,056 psi | 85% | 2671 fps | 99% |
| Ramshot Hunter | <<locked>> | 90% | 54,723 psi | 86% | 2615 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,040 psi | 82% | 2612 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,275 psi | 58% | 1634 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,085 psi | 85% | 2539 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,216 psi | 87% | 2628 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,290 psi | 90% | 2644 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,782 psi | 87% | 2674 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,703 psi | 75% | 2644 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 82% | 57,203 psi | 90% | 2526 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 54,172 psi | 85% | 2530 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,173 psi | 88% | 2598 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 96% | 56,985 psi | 89% | 2651 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 88% | 56,855 psi | 89% | 2579 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,274 psi | 87% | 2549 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,448 psi | 87% | 2520 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,739 psi | 89% | 2592 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,912 psi | 88% | 2585 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,882 psi | 86% | 2421 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,708 psi | 86% | 2507 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,521 psi | 89% | 2648 fps | 99.6% |
| Somchem S355 | <<locked>> | 86% | 57,725 psi | 90% | 2572 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,201 psi | 85% | 2543 fps | 98% |
| Somchem S365 | <<locked>> | 92% | 55,695 psi | 87% | 2605 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 57,580 psi | 90% | 2625 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 86% | 55,347 psi | 87% | 2500 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,186 psi | 85% | 2552 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,985 psi | 89% | 2605 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 82% | 56,188 psi | 88% | 2500 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,985 psi | 89% | 2605 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 54,868 psi | 86% | 2621 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,303 psi | 87% | 2690 fps | 98.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 50,517 psi | 79% | 2605 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,667 psi | 90% | 2562 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,825 psi | 87% | 2628 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 52,649 psi | 83% | 2717 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 53,896 psi | 84% | 2572 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% | 47,268 psi | 74% | 2398 fps | 98.9% |
| Accurate 3100 | <<locked>> | 80% | 29,602 psi | 46% | 2142 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 52,127 psi | 82% | 2464 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,437 psi | 63% | 2379 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 94% | 47,311 psi | 74% | 2562 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 49,182 psi | 77% | 2454 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 36,477 psi | 57% | 2313 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 88% | 39,726 psi | 62% | 2405 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 98% | 40,625 psi | 64% | 2415 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 94% | 31,531 psi | 49% | 2267 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,995 psi | 78% | 2474 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,417 psi | 84% | 2539 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,291 psi | 62% | 2388 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,976 psi | 70% | 2493 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 36,390 psi | 57% | 2310 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 86% | 36,738 psi | 58% | 2359 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,631 psi | 45% | 2172 fps | 98.9% |
| Alliant Reloder-25 | <<locked>> | 84% | 28,645 psi | 45% | 2188 fps | 96% |
| Alliant Reloder-26 | 70.7 gr | 80% | 30,850 psi | 48% | 2283 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 51,517 psi | 81% | 2539 fps | 95.2% |
| Bofors RP15 | <<locked>> | 88% | 36,434 psi | 57% | 2352 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 50,517 psi | 79% | 2487 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 38,551 psi | 60% | 2425 fps | 95.8% |
| Bofors RP5 | <<locked>> | 86% | 36,738 psi | 58% | 2359 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 44,164 psi | 69% | 2388 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 94% | 38,914 psi | 61% | 2385 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 50,734 psi | 80% | 2503 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,496 psi | 67% | 2425 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 80% | 45,353 psi | 71% | 2438 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 88% | 42,583 psi | 67% | 2411 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 41,713 psi | 65% | 2398 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,724 psi | 58% | 2283 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 34,055 psi | 53% | 2362 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 41,481 psi | 65% | 2438 fps | 98.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,412 psi | 43% | 1427 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,750 psi | 81% | 2480 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,012 psi | 85% | 2516 fps | 99.9% |
| IMR 4350 | <<locked>> | 80% | 39,682 psi | 62% | 2326 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,643 psi | 72% | 2411 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 38,696 psi | 61% | 2333 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 41,727 psi | 65% | 2362 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 90% | 40,698 psi | 64% | 2438 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 52,069 psi | 82% | 2477 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,902 psi | 67% | 2365 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 41,292 psi | 65% | 2356 fps | 98.6% |
| Lovex S071 | <<locked>> | 84% | 28,964 psi | 45% | 2126 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 52,736 psi | 83% | 2526 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,320 psi | 62% | 2352 fps | 96.3% |
| Norma MRP | 68.6 gr | 80% | 31,038 psi | 49% | 2254 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 40,205 psi | 63% | 2372 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 80% | 53,577 psi | 84% | 2549 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 40,408 psi | 63% | 2444 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 38,972 psi | 61% | 2365 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 88% | 33,301 psi | 52% | 2277 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,891 psi | 44% | 1460 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,662 psi | 79% | 2493 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,834 psi | 75% | 2536 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,350 psi | 63% | 2395 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,030 psi | 61% | 2411 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 33,141 psi | 52% | 2339 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 53,708 psi | 84% | 2484 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,572 psi | 75% | 2441 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 40,611 psi | 64% | 2349 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 82% | 35,476 psi | 56% | 2293 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 44,164 psi | 69% | 2388 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,902 psi | 67% | 2365 fps | 99.5% |
| Shooters World Precision | <<locked>> | 80% | 52,069 psi | 82% | 2477 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,292 psi | 65% | 2356 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,907 psi | 77% | 2490 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,486 psi | 76% | 2343 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,003 psi | 66% | 2316 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 35,172 psi | 55% | 2290 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 47,558 psi | 75% | 2438 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 41,365 psi | 65% | 2339 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 36,680 psi | 57% | 2329 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 33,678 psi | 53% | 2231 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 45,658 psi | 72% | 2375 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,611 psi | 65% | 2369 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 33,315 psi | 52% | 2218 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 52,663 psi | 83% | 2457 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,930 psi | 64% | 2369 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 31,981 psi | 50% | 2241 fps | 98.8% |
| Vihtavuori N560 | 75.5 gr | 88% | 41,713 psi | 65% | 2467 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 94% | 41,060 psi | 64% | 2448 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,669 psi | 64% | 2336 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,670 psi | 67% | 2425 fps | 98.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,222 psi | 40% | 2169 fps | 98.6% |
| Winchester Supreme 780 | <<locked>> | 84% | 35,259 psi | 55% | 2264 fps | 95.2% |
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 94 powders for .338 Rem. Ultra Mag. loaded with the .338 | 252gr | CutEdge MTH. Alliant Reloder-26 delivers the highest muzzle velocity at 2,730 fps; across all powders the maximum-charge window runs from 1,598 fps to 2,730 fps. ADI AR 2217 gives the best case fill at 100 %, and 94 of the 94 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 252.0 gr projectile in 0.338" calls for a 1:10.5 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, Alliant Reloder-26 rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 252gr | CutEdge MTH they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, Vihtavuori N170, Vihtavuori N570 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.