Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 250gr | Alaska Bullet Works Kodiak PP SPBC bullet and 77 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% | 55,332 psi | 87% | 2608 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,739 psi | 89% | 2638 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 53,983 psi | 85% | 2700 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 82% | 57,479 psi | 90% | 2595 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,522 psi | 90% | 2694 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 94% | 55,274 psi | 87% | 2700 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,545 psi | 78% | 2608 fps | 98.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,237 psi | 69% | 2575 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,595 psi | 90% | 2690 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,595 psi | 90% | 2690 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,493 psi | 90% | 2687 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,897 psi | 86% | 2651 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,869 psi | 89% | 2684 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,332 psi | 87% | 2697 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,550 psi | 89% | 2664 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,825 psi | 87% | 2723 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,101 psi | 89% | 2749 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,043 psi | 89% | 2664 fps | 97.2% |
| Bofors RP15 | <<locked>> | 96% | 54,317 psi | 85% | 2684 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,866 psi | 81% | 2674 fps | 99.2% |
| Bofors RP5 | <<locked>> | 94% | 55,332 psi | 87% | 2697 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 55,405 psi | 87% | 2589 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,723 psi | 86% | 2687 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 84% | 54,708 psi | 86% | 2641 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 57,276 psi | 90% | 2648 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 92% | 55,172 psi | 86% | 2641 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 53,998 psi | 85% | 2625 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,230 psi | 85% | 2569 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,723 psi | 86% | 2792 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 55,100 psi | 86% | 2674 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,144 psi | 58% | 1644 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,043 psi | 89% | 2628 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,855 psi | 89% | 2612 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 57,029 psi | 89% | 2628 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,231 psi | 88% | 2628 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 96% | 56,811 psi | 89% | 2733 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 39,740 psi | 62% | 2484 fps | 96.5% |
| Lovex S065 | <<locked>> | 86% | 57,450 psi | 90% | 2608 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,753 psi | 87% | 2608 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,594 psi | 89% | 2625 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,259 psi | 85% | 2628 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 39,813 psi | 62% | 2510 fps | 98.6% |
| Norma MRP | <<locked>> | 92% | 54,998 psi | 86% | 2713 fps | 100% |
| Norma URP | <<locked>> | 86% | 55,172 psi | 86% | 2621 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 53,708 psi | 84% | 2697 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 88% | 57,624 psi | 90% | 2677 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,115 psi | 88% | 2690 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,985 psi | 60% | 1683 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,710 psi | 89% | 2657 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,042 psi | 86% | 2687 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,564 psi | 87% | 2789 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,198 psi | 79% | 2684 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 82% | 56,855 psi | 89% | 2589 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,085 psi | 86% | 2615 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 92% | 56,492 psi | 89% | 2674 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 55,405 psi | 87% | 2589 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,450 psi | 90% | 2608 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,753 psi | 87% | 2608 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,565 psi | 89% | 2467 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,797 psi | 89% | 2569 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,057 psi | 88% | 2667 fps | 99.8% |
| Somchem S355 | <<locked>> | 82% | 56,463 psi | 88% | 2582 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,521 psi | 89% | 2605 fps | 98.8% |
| Somchem S365 | <<locked>> | 88% | 55,608 psi | 87% | 2625 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,942 psi | 89% | 2644 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 57,682 psi | 90% | 2552 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,884 psi | 89% | 2612 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,478 psi | 89% | 2628 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 56,072 psi | 88% | 2621 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,143 psi | 86% | 2644 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,839 psi | 86% | 2710 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 98% | 54,824 psi | 86% | 2694 fps | 99% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,445 psi | 81% | 2690 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,318 psi | 88% | 2572 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,911 psi | 86% | 2641 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,259 psi | 85% | 2740 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,014 psi | 89% | 2644 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% | 34,592 psi | 54% | 2267 fps | 98.1% |
| Accurate 4350 | <<locked>> | 80% | 46,325 psi | 73% | 2493 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 40,669 psi | 64% | 2470 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 53,983 psi | 85% | 2549 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,566 psi | 60% | 2382 fps | 96.8% |
| ADI AR 2213 | <<locked>> | 84% | 39,349 psi | 62% | 2425 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 92% | 37,927 psi | 59% | 2392 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 88% | 29,950 psi | 47% | 2247 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,001 psi | 61% | 2385 fps | 96.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,001 psi | 61% | 2385 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,309 psi | 69% | 2500 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,169 psi | 80% | 2602 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,638 psi | 61% | 2379 fps | 96.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,476 psi | 54% | 2326 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,156 psi | 52% | 2293 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,892 psi | 45% | 2211 fps | 96.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,289 psi | 57% | 2421 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,401 psi | 79% | 2559 fps | 95.7% |
| Bofors RP15 | <<locked>> | 82% | 34,316 psi | 54% | 2323 fps | 95.3% |
| Bofors RP30 | <<locked>> | 90% | 36,767 psi | 58% | 2405 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 34,476 psi | 54% | 2326 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 48,820 psi | 77% | 2493 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 36,318 psi | 57% | 2356 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 47,935 psi | 75% | 2539 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 50,444 psi | 79% | 2549 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 82% | 39,320 psi | 62% | 2379 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,263 psi | 65% | 2415 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,800 psi | 66% | 2392 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 34,272 psi | 54% | 2392 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 47,398 psi | 74% | 2559 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,818 psi | 44% | 1470 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,353 psi | 70% | 2434 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,198 psi | 79% | 2516 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 43,990 psi | 69% | 2444 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 41,046 psi | 64% | 2379 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 84% | 37,840 psi | 59% | 2405 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 98% | 37,173 psi | 58% | 2431 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 47,819 psi | 75% | 2470 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,166 psi | 72% | 2464 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 29,762 psi | 47% | 2156 fps | 96.4% |
| Norma 204 | <<locked>> | 80% | 44,309 psi | 69% | 2467 fps | 98.1% |
| Norma 217 | <<locked>> | 92% | 30,589 psi | 48% | 2293 fps | 95% |
| Norma MRP | 75.5 gr | 80% | 35,998 psi | 56% | 2388 fps | 97.6% |
| Norma URP | <<locked>> | 80% | 45,382 psi | 71% | 2480 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 37,405 psi | 59% | 2405 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 44,121 psi | 69% | 2477 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 84% | 33,402 psi | 52% | 2300 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,500 psi | 45% | 1506 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,151 psi | 72% | 2510 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,396 psi | 70% | 2530 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 31,256 psi | 49% | 2313 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 40,089 psi | 63% | 2503 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 53,258 psi | 83% | 2543 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 40,001 psi | 63% | 2362 fps | 96% |
| Rottweil R 905 | <<locked>> | 80% | 37,898 psi | 59% | 2362 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 80% | 48,820 psi | 77% | 2493 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,819 psi | 75% | 2470 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,166 psi | 72% | 2464 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,055 psi | 83% | 2425 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,702 psi | 73% | 2425 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,565 psi | 59% | 2359 fps | 96.7% |
| Somchem S355 | <<locked>> | 80% | 52,968 psi | 83% | 2536 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 40,611 psi | 64% | 2352 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 42,424 psi | 66% | 2441 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,566 psi | 60% | 2352 fps | 97.8% |
| Vihtavuori N150 | <<locked>> | 80% | 50,749 psi | 80% | 2467 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,818 psi | 73% | 2474 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,373 psi | 52% | 2238 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 46,050 psi | 72% | 2477 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,275 psi | 58% | 2362 fps | 99.8% |
| Vihtavuori N560 | 77.4 gr | 82% | 38,812 psi | 61% | 2431 fps | 95% |
| Vihtavuori N565 | <<locked>> | 88% | 39,015 psi | 61% | 2425 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 96% | 44,643 psi | 70% | 2572 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,861 psi | 72% | 2438 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,935 psi | 75% | 2539 fps | 99.7% |
| Winchester StaBALL HD | 74.7 gr | 80% | 29,428 psi | 46% | 2313 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,099 psi | 55% | 2280 fps | 95.6% |
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 77 powders for .338 Rem. Ultra Mag. loaded with the .338 | 250gr | Alaska Bullet Works Kodiak PP SPBC. Hodgdon Retumbo delivers the highest muzzle velocity at 2,792 fps; across all powders the maximum-charge window runs from 1,644 fps to 2,792 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 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 1:16.0 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 | Alaska Bullet Works Kodiak PP SPBC 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.