Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 225gr | Alaska Bullet Works Kodiak PP SPBC bullet and 82 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 84% | 55,927 psi | 88% | 2674 fps | 99.5% |
| Accurate 3100 | <<locked>> | 96% | 54,230 psi | 85% | 2717 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 55,883 psi | 88% | 2759 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 57,551 psi | 90% | 2864 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 84% | 57,334 psi | 90% | 2723 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,753 psi | 89% | 2808 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 96% | 54,433 psi | 85% | 2805 fps | 98.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 45,484 psi | 71% | 2641 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,422 psi | 63% | 2605 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,027 psi | 86% | 2697 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,666 psi | 89% | 2808 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,114 psi | 85% | 2776 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,115 psi | 88% | 2795 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,085 psi | 85% | 2802 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,926 psi | 86% | 2779 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,836 psi | 80% | 2782 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,361 psi | 87% | 2864 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 56,753 psi | 89% | 2766 fps | 95.8% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,695 psi | 89% | 2838 fps | 99.4% |
| Bofors RP3 | <<locked>> | 82% | 56,173 psi | 88% | 2717 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,804 psi | 73% | 2713 fps | 97.4% |
| Bofors RP5 | <<locked>> | 96% | 54,085 psi | 85% | 2802 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 55,143 psi | 86% | 2707 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,212 psi | 79% | 2730 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 82% | 56,275 psi | 88% | 2733 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,012 psi | 85% | 2756 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 86% | 56,869 psi | 89% | 2769 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 94% | 54,433 psi | 85% | 2749 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 96% | 57,101 psi | 89% | 2789 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 57,000 psi | 89% | 2733 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,792 psi | 78% | 2831 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 86% | 54,418 psi | 85% | 2789 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,869 psi | 58% | 1726 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,869 psi | 89% | 2707 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,652 psi | 89% | 2743 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,594 psi | 89% | 2730 fps | 99.8% |
| IMR 4831 | <<locked>> | 90% | 56,289 psi | 88% | 2749 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,796 psi | 87% | 2736 fps | 98% |
| IMR 7828 SSC | <<locked>> | 98% | 55,666 psi | 87% | 2835 fps | 98.5% |
| Lovex S062 | <<locked>> | 82% | 57,159 psi | 90% | 2697 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,246 psi | 90% | 2730 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,187 psi | 86% | 2723 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,634 psi | 81% | 2680 fps | 99.9% |
| Norma 204 | <<locked>> | 90% | 57,711 psi | 90% | 2799 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 35,839 psi | 56% | 2526 fps | 96.1% |
| Norma MRP | <<locked>> | 96% | 57,667 psi | 90% | 2881 fps | 100% |
| Norma URP | <<locked>> | 88% | 54,346 psi | 85% | 2743 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,608 psi | 89% | 2858 fps | 99% |
| Ramshot Hunter | <<locked>> | 90% | 56,956 psi | 89% | 2795 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,694 psi | 86% | 2792 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,492 psi | 59% | 1765 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,869 psi | 88% | 2720 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,493 psi | 90% | 2815 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,854 psi | 88% | 2779 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,128 psi | 85% | 2805 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,256 psi | 79% | 2828 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 84% | 56,231 psi | 88% | 2710 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,447 psi | 85% | 2723 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 94% | 55,579 psi | 87% | 2785 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 86% | 55,143 psi | 86% | 2707 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,246 psi | 90% | 2730 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,159 psi | 90% | 2697 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,187 psi | 86% | 2723 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,215 psi | 85% | 2720 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,449 psi | 88% | 2592 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,681 psi | 89% | 2687 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,129 psi | 86% | 2779 fps | 99.2% |
| Somchem S355 | <<locked>> | 84% | 56,028 psi | 88% | 2707 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,289 psi | 88% | 2717 fps | 97.9% |
| Somchem S365 | <<locked>> | 90% | 54,476 psi | 85% | 2746 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,246 psi | 88% | 2759 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 86% | 57,290 psi | 90% | 2677 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,304 psi | 88% | 2733 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,709 psi | 87% | 2736 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 88% | 55,405 psi | 87% | 2740 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 57,319 psi | 90% | 2802 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,609 psi | 90% | 2874 fps | 98.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 53,272 psi | 83% | 2792 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,970 psi | 88% | 2697 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,215 psi | 85% | 2759 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,854 psi | 88% | 2904 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,188 psi | 88% | 2753 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% | 49,037 psi | 77% | 2569 fps | 98.8% |
| Accurate 3100 | <<locked>> | 80% | 31,444 psi | 49% | 2303 fps | 95.8% |
| Accurate 4350 | <<locked>> | 80% | 42,395 psi | 66% | 2549 fps | 99.7% |
| Accurate MAGPRO | 90.6 gr | 94% | 49,792 psi | 78% | 2743 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 50,705 psi | 79% | 2631 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 38,159 psi | 60% | 2480 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 90% | 44,411 psi | 70% | 2631 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 98% | 42,525 psi | 67% | 2585 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 94% | 33,286 psi | 52% | 2431 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,808 psi | 81% | 2651 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,683 psi | 64% | 2556 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,934 psi | 74% | 2671 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 38,058 psi | 60% | 2477 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 86% | 38,508 psi | 60% | 2526 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,284 psi | 47% | 2336 fps | 98.8% |
| Alliant Reloder-25 | <<locked>> | 84% | 30,240 psi | 47% | 2349 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 32,735 psi | 51% | 2451 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 53,388 psi | 84% | 2713 fps | 95% |
| Bofors RP15 | <<locked>> | 88% | 38,159 psi | 60% | 2516 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 52,475 psi | 82% | 2667 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 40,727 psi | 64% | 2595 fps | 95.7% |
| Bofors RP5 | <<locked>> | 86% | 38,508 psi | 60% | 2526 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 45,687 psi | 72% | 2556 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 94% | 40,872 psi | 64% | 2556 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 52,605 psi | 82% | 2680 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,179 psi | 69% | 2595 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 80% | 46,862 psi | 73% | 2608 fps | 98% |
| Hodgdon H4831 | <<locked>> | 88% | 44,425 psi | 70% | 2582 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 43,584 psi | 68% | 2569 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,450 psi | 60% | 2451 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 35,824 psi | 56% | 2530 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 43,395 psi | 68% | 2608 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,470 psi | 43% | 1542 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,374 psi | 84% | 2661 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,133 psi | 64% | 2487 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,079 psi | 74% | 2582 fps | 98.9% |
| IMR 4831 | <<locked>> | 80% | 40,582 psi | 64% | 2503 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 43,381 psi | 68% | 2530 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 90% | 42,612 psi | 67% | 2608 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 53,838 psi | 84% | 2654 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,686 psi | 70% | 2536 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 42,975 psi | 67% | 2523 fps | 98.4% |
| Lovex S071 | <<locked>> | 84% | 30,835 psi | 48% | 2287 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 40,959 psi | 64% | 2520 fps | 96.1% |
| Norma 217 | <<locked>> | 98% | 33,562 psi | 53% | 2470 fps | 95% |
| Norma MRP | 77.6 gr | 82% | 35,186 psi | 55% | 2477 fps | 96% |
| Norma URP | <<locked>> | 80% | 41,916 psi | 66% | 2543 fps | 99.6% |
| Ramshot Grand | <<locked>> | 90% | 42,235 psi | 66% | 2615 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 40,698 psi | 64% | 2533 fps | 98.5% |
| Ramshot Magnum | <<locked>> | 88% | 35,085 psi | 55% | 2438 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,079 psi | 44% | 1581 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,460 psi | 82% | 2667 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,777 psi | 78% | 2713 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,293 psi | 66% | 2566 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,727 psi | 64% | 2579 fps | 99.4% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 35,056 psi | 55% | 2510 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 80% | 49,559 psi | 78% | 2618 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 42,177 psi | 66% | 2513 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 82% | 37,217 psi | 58% | 2461 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 45,687 psi | 72% | 2556 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,686 psi | 70% | 2536 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 53,838 psi | 84% | 2654 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,975 psi | 67% | 2523 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,705 psi | 79% | 2667 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,922 psi | 78% | 2510 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,671 psi | 68% | 2484 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 36,883 psi | 58% | 2454 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 49,487 psi | 78% | 2615 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 46,064 psi | 72% | 2556 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 38,522 psi | 60% | 2500 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,375 psi | 55% | 2392 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 47,369 psi | 74% | 2546 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,192 psi | 68% | 2536 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 37,391 psi | 59% | 2428 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 42,685 psi | 67% | 2539 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 33,794 psi | 53% | 2405 fps | 98.7% |
| Vihtavuori N560 | 83.3 gr | 88% | 43,743 psi | 69% | 2641 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 94% | 43,482 psi | 68% | 2625 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,380 psi | 66% | 2500 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,353 psi | 70% | 2598 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,803 psi | 42% | 2329 fps | 98.6% |
| Winchester Supreme 780 | <<locked>> | 84% | 37,014 psi | 58% | 2425 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 82 powders for .338 Rem. Ultra Mag. loaded with the .338 | 225gr | Alaska Bullet Works Kodiak PP SPBC. Winchester StaBALL HD delivers the highest muzzle velocity at 2,904 fps; across all powders the maximum-charge window runs from 1,726 fps to 2,904 fps. ADI AR 2217 gives the best case fill at 100 %, and 82 of the 82 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:15.5 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. Norma MRP, Vihtavuori N560, Accurate MAGPRO rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 225gr | 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.