Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 250gr | Woodleigh PP SN bullet and 74 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Vihtavuori N560 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 55,782 psi | 87% | 2615 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 57,058 psi | 89% | 2644 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 54,215 psi | 85% | 2703 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 90% | 54,143 psi | 85% | 2648 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 55,535 psi | 87% | 2703 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,748 psi | 78% | 2612 fps | 98.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,454 psi | 70% | 2579 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,360 psi | 85% | 2648 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,230 psi | 87% | 2654 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,363 psi | 90% | 2690 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,564 psi | 87% | 2700 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,840 psi | 89% | 2671 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,057 psi | 88% | 2726 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,377 psi | 90% | 2756 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,174 psi | 90% | 2664 fps | 97.2% |
| Bofors RP15 | <<locked>> | 96% | 54,549 psi | 85% | 2687 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,083 psi | 82% | 2677 fps | 99.2% |
| Bofors RP5 | <<locked>> | 94% | 55,564 psi | 87% | 2700 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 55,709 psi | 87% | 2595 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,955 psi | 86% | 2694 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 84% | 55,013 psi | 86% | 2644 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 57,566 psi | 90% | 2654 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 92% | 55,419 psi | 87% | 2648 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,433 psi | 85% | 2635 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,549 psi | 85% | 2572 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,969 psi | 86% | 2799 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 55,376 psi | 87% | 2677 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,057 psi | 58% | 1644 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,305 psi | 90% | 2631 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,145 psi | 90% | 2618 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 57,319 psi | 90% | 2635 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,449 psi | 88% | 2631 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 96% | 57,305 psi | 90% | 2740 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 39,929 psi | 63% | 2490 fps | 96.6% |
| Lovex S065 | <<locked>> | 86% | 57,740 psi | 90% | 2612 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,840 psi | 88% | 2608 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,855 psi | 89% | 2628 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,549 psi | 85% | 2635 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 40,045 psi | 63% | 2516 fps | 98.7% |
| Norma MRP | <<locked>> | 92% | 55,492 psi | 87% | 2720 fps | 100% |
| Norma URP | <<locked>> | 86% | 55,274 psi | 87% | 2625 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 53,954 psi | 85% | 2700 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 54,143 psi | 85% | 2631 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,362 psi | 88% | 2694 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,913 psi | 59% | 1683 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 57,000 psi | 89% | 2664 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,376 psi | 87% | 2690 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,782 psi | 87% | 2792 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,589 psi | 79% | 2690 fps | 98% |
| Rottweil R 903 | <<locked>> | 82% | 56,985 psi | 89% | 2589 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,361 psi | 87% | 2621 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 92% | 56,753 psi | 89% | 2677 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 55,709 psi | 87% | 2595 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,740 psi | 90% | 2612 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,840 psi | 88% | 2608 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,695 psi | 89% | 2470 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,058 psi | 89% | 2572 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,347 psi | 88% | 2674 fps | 99.8% |
| Somchem S355 | <<locked>> | 82% | 56,550 psi | 89% | 2585 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,884 psi | 89% | 2615 fps | 98.9% |
| Somchem S365 | <<locked>> | 88% | 55,927 psi | 88% | 2628 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,406 psi | 90% | 2654 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 54,244 psi | 85% | 2513 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 57,188 psi | 90% | 2618 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,884 psi | 89% | 2631 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 56,347 psi | 88% | 2625 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,434 psi | 87% | 2648 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,259 psi | 87% | 2717 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 98% | 55,085 psi | 86% | 2700 fps | 99.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,880 psi | 81% | 2697 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,608 psi | 89% | 2575 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,201 psi | 87% | 2648 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,534 psi | 85% | 2746 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,276 psi | 90% | 2648 fps | 99.8% |
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% | 34,737 psi | 54% | 2270 fps | 98.1% |
| Accurate 4350 | <<locked>> | 80% | 46,470 psi | 73% | 2497 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 40,901 psi | 64% | 2477 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 38,696 psi | 61% | 2385 fps | 96.8% |
| ADI AR 2213 | <<locked>> | 84% | 39,581 psi | 62% | 2431 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 92% | 38,101 psi | 60% | 2395 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 88% | 30,226 psi | 47% | 2257 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,425 psi | 70% | 2500 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,503 psi | 81% | 2608 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,740 psi | 61% | 2382 fps | 96.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,592 psi | 54% | 2329 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,402 psi | 52% | 2300 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,993 psi | 45% | 2218 fps | 96.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,550 psi | 57% | 2428 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,575 psi | 79% | 2566 fps | 95.8% |
| Bofors RP15 | <<locked>> | 82% | 34,432 psi | 54% | 2326 fps | 95.4% |
| Bofors RP30 | <<locked>> | 90% | 36,999 psi | 58% | 2411 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 34,592 psi | 54% | 2329 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 49,095 psi | 77% | 2500 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 36,506 psi | 57% | 2362 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 48,066 psi | 75% | 2539 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 50,575 psi | 79% | 2552 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 82% | 39,566 psi | 62% | 2382 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,510 psi | 65% | 2421 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,090 psi | 66% | 2395 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 32,343 psi | 51% | 2343 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 47,659 psi | 75% | 2566 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,804 psi | 44% | 1470 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,440 psi | 70% | 2438 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,459 psi | 79% | 2520 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 44,280 psi | 69% | 2448 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 41,292 psi | 65% | 2385 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 84% | 38,072 psi | 60% | 2411 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 98% | 37,492 psi | 59% | 2438 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 48,095 psi | 75% | 2477 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,427 psi | 73% | 2470 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 29,994 psi | 47% | 2165 fps | 96.5% |
| Norma 204 | <<locked>> | 80% | 44,556 psi | 70% | 2474 fps | 98.2% |
| Norma 217 | <<locked>> | 92% | 30,777 psi | 48% | 2300 fps | 95.2% |
| Norma MRP | 75.9 gr | 80% | 36,216 psi | 57% | 2392 fps | 97.7% |
| Norma URP | <<locked>> | 80% | 45,672 psi | 72% | 2487 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 37,637 psi | 59% | 2415 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 44,396 psi | 70% | 2484 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 31,299 psi | 49% | 2247 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,471 psi | 45% | 1506 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,412 psi | 73% | 2516 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,672 psi | 70% | 2533 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 31,430 psi | 49% | 2320 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 40,422 psi | 63% | 2507 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 53,621 psi | 84% | 2546 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 40,103 psi | 63% | 2365 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 80% | 38,145 psi | 60% | 2369 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 80% | 49,095 psi | 77% | 2500 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,095 psi | 75% | 2477 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,427 psi | 73% | 2470 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,359 psi | 84% | 2431 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,007 psi | 74% | 2428 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,826 psi | 59% | 2365 fps | 96.8% |
| Somchem S355 | <<locked>> | 80% | 53,301 psi | 84% | 2543 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 40,828 psi | 64% | 2359 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 42,583 psi | 67% | 2444 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,682 psi | 61% | 2356 fps | 97.8% |
| Vihtavuori N150 | <<locked>> | 80% | 51,053 psi | 80% | 2474 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,934 psi | 74% | 2477 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,475 psi | 52% | 2238 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 46,340 psi | 73% | 2484 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,420 psi | 59% | 2365 fps | 99.9% |
| Vihtavuori N560 | 77.8 gr | 82% | 39,059 psi | 61% | 2438 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 88% | 39,233 psi | 61% | 2431 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 94% | 41,989 psi | 66% | 2523 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,122 psi | 72% | 2441 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,254 psi | 76% | 2543 fps | 99.7% |
| Winchester StaBALL HD | 75.1 gr | 80% | 29,660 psi | 46% | 2320 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,331 psi | 55% | 2287 fps | 95.8% |
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 74 powders for .338 Rem. Ultra Mag. loaded with the .338 | 250gr | Woodleigh PP SN. Hodgdon Retumbo delivers the highest muzzle velocity at 2,799 fps; across all powders the maximum-charge window runs from 1,644 fps to 2,799 fps. ADI AR 2217 gives the best case fill at 100 %, and 74 of the 74 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 1:16.5 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, Vihtavuori N560, Norma MRP rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 250gr | Woodleigh PP SN 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.