Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 215gr | Sierra GameKing bullet and 86 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate MAGPRO and Accurate High Country.
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>> | 82% | 57,217 psi | 90% | 2759 fps | 99.5% |
| Accurate 3100 | <<locked>> | 98% | 56,927 psi | 89% | 2808 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 56,855 psi | 89% | 2736 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 54,694 psi | 86% | 2802 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 54,418 psi | 85% | 2897 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 96% | 55,347 psi | 87% | 2894 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 84% | 56,579 psi | 89% | 2772 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 55,506 psi | 87% | 2844 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 98% | 57,145 psi | 90% | 2900 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,465 psi | 62% | 2631 fps | 97.6% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,782 psi | 87% | 2844 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,782 psi | 87% | 2844 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,696 psi | 90% | 2795 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,740 psi | 90% | 2815 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 55,492 psi | 87% | 2854 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 56,753 psi | 89% | 2871 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,056 psi | 86% | 2835 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 98% | 56,695 psi | 89% | 2897 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 57,363 psi | 90% | 2871 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,617 psi | 78% | 2815 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 53,969 psi | 85% | 2904 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,390 psi | 87% | 2877 fps | 99% |
| Bofors RP3 | <<locked>> | 82% | 55,042 psi | 86% | 2759 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 45,556 psi | 71% | 2743 fps | 96.7% |
| Bofors RP5 | <<locked>> | 98% | 56,695 psi | 89% | 2897 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 57,740 psi | 90% | 2802 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,037 psi | 77% | 2759 fps | 97.6% |
| Hodgdon H380 | <<locked>> | 82% | 55,187 psi | 86% | 2776 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,652 psi | 89% | 2851 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 86% | 55,883 psi | 88% | 2812 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 96% | 57,203 psi | 90% | 2844 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,927 psi | 88% | 2825 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,811 psi | 87% | 2779 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,588 psi | 76% | 2864 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 88% | 57,305 psi | 90% | 2887 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,753 psi | 58% | 1765 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,941 psi | 88% | 2756 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,593 psi | 87% | 2785 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,738 psi | 87% | 2776 fps | 99.6% |
| IMR 4831 | <<locked>> | 90% | 55,114 psi | 86% | 2792 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 54,694 psi | 86% | 2776 fps | 97.4% |
| IMR 7828 SSC | <<locked>> | 98% | 54,665 psi | 86% | 2877 fps | 98.1% |
| Lovex S062 | <<locked>> | 82% | 56,202 psi | 88% | 2746 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,086 psi | 88% | 2772 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 57,667 psi | 90% | 2815 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,546 psi | 79% | 2720 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 57,087 psi | 89% | 2802 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,463 psi | 88% | 2838 fps | 98.9% |
| Norma MRP | <<locked>> | 96% | 56,449 psi | 88% | 2920 fps | 99.8% |
| Norma URP | <<locked>> | 90% | 56,826 psi | 89% | 2835 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,201 psi | 87% | 2890 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 90% | 55,695 psi | 87% | 2838 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,403 psi | 84% | 2828 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,492 psi | 59% | 1808 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,940 psi | 86% | 2762 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 56,188 psi | 88% | 2861 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 54,752 psi | 86% | 2822 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,826 psi | 89% | 2904 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,037 psi | 77% | 2861 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 55,274 psi | 87% | 2759 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,087 psi | 89% | 2818 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 94% | 54,491 psi | 85% | 2825 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 88% | 57,740 psi | 90% | 2802 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,086 psi | 88% | 2772 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 56,202 psi | 88% | 2746 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,667 psi | 90% | 2815 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,724 psi | 89% | 2812 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,579 psi | 87% | 2641 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,724 psi | 87% | 2726 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 57,740 psi | 90% | 2874 fps | 99.3% |
| Somchem S355 | <<locked>> | 84% | 54,969 psi | 86% | 2753 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,201 psi | 87% | 2753 fps | 97.3% |
| Somchem S365 | <<locked>> | 92% | 56,869 psi | 89% | 2835 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 54,969 psi | 86% | 2795 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 86% | 56,333 psi | 88% | 2726 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,230 psi | 87% | 2779 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 54,491 psi | 85% | 2772 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 82% | 56,985 psi | 89% | 2723 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 54,534 psi | 85% | 2785 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,115 psi | 88% | 2848 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 56,449 psi | 88% | 2913 fps | 97.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,054 psi | 82% | 2825 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 54,723 psi | 86% | 2740 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,840 psi | 89% | 2854 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 54,157 psi | 85% | 2946 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,187 psi | 86% | 2792 fps | 98.9% |
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% | 53,403 psi | 84% | 2703 fps | 99.1% |
| Accurate 3100 | <<locked>> | 82% | 32,924 psi | 52% | 2388 fps | 96% |
| Accurate 4064 | <<locked>> | 80% | 53,388 psi | 84% | 2694 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,437 psi | 65% | 2585 fps | 99.5% |
| Accurate High Country | 84.4 gr | 88% | 43,990 psi | 69% | 2717 fps | 95.7% |
| Accurate MAGPRO | 89.9 gr | 92% | 47,964 psi | 75% | 2772 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 49,908 psi | 78% | 2674 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 39,871 psi | 62% | 2569 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 90% | 43,468 psi | 68% | 2664 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 96% | 34,679 psi | 54% | 2513 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 40,103 psi | 63% | 2569 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 40,103 psi | 63% | 2569 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,720 psi | 79% | 2697 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 54,070 psi | 85% | 2766 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,885 psi | 63% | 2595 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,774 psi | 72% | 2710 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 39,697 psi | 62% | 2562 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 88% | 40,364 psi | 63% | 2615 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,486 psi | 46% | 2362 fps | 98.1% |
| Alliant Reloder-25 | <<locked>> | 86% | 31,459 psi | 49% | 2428 fps | 95.9% |
| Alliant Reloder-26 | 79.1 gr | 80% | 31,966 psi | 50% | 2477 fps | 97% |
| Bofors RP15 | <<locked>> | 90% | 39,827 psi | 62% | 2602 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 51,445 psi | 81% | 2710 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 42,627 psi | 67% | 2687 fps | 95.8% |
| Bofors RP5 | <<locked>> | 88% | 40,364 psi | 63% | 2615 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 44,904 psi | 70% | 2595 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 96% | 42,786 psi | 67% | 2644 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 51,590 psi | 81% | 2726 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 43,366 psi | 68% | 2635 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 80% | 45,963 psi | 72% | 2648 fps | 97.5% |
| Hodgdon H4831 | <<locked>> | 90% | 46,601 psi | 73% | 2674 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 45,600 psi | 71% | 2657 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,507 psi | 59% | 2487 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 37,318 psi | 58% | 2615 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 42,380 psi | 66% | 2644 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,470 psi | 43% | 1581 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,489 psi | 82% | 2707 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,364 psi | 63% | 2526 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,311 psi | 73% | 2625 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 39,726 psi | 62% | 2539 fps | 99.3% |
| IMR 4955 Enduron | <<locked>> | 88% | 45,382 psi | 71% | 2618 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 92% | 44,512 psi | 70% | 2697 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 52,794 psi | 83% | 2700 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,758 psi | 69% | 2575 fps | 99% |
| Lovex S070 | <<locked>> | 80% | 42,032 psi | 66% | 2559 fps | 97.9% |
| Lovex S071 | <<locked>> | 86% | 32,198 psi | 50% | 2369 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 53,432 psi | 84% | 2749 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,089 psi | 63% | 2552 fps | 95.3% |
| Norma MRP | <<locked>> | 82% | 34,374 psi | 54% | 2507 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 40,901 psi | 64% | 2575 fps | 99.3% |
| Ramshot Grand | <<locked>> | 92% | 44,411 psi | 70% | 2707 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 39,755 psi | 62% | 2566 fps | 98% |
| Ramshot Magnum | <<locked>> | 90% | 36,825 psi | 58% | 2523 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,065 psi | 44% | 1621 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,503 psi | 81% | 2710 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,573 psi | 76% | 2756 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,437 psi | 65% | 2605 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,784 psi | 62% | 2615 fps | 99% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 34,258 psi | 54% | 2530 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 48,428 psi | 76% | 2661 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 44,048 psi | 69% | 2602 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 84% | 38,870 psi | 61% | 2546 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 44,904 psi | 70% | 2595 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,758 psi | 69% | 2575 fps | 99% |
| Shooters World Precision | <<locked>> | 80% | 52,794 psi | 83% | 2700 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,032 psi | 66% | 2559 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,705 psi | 78% | 2710 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,037 psi | 77% | 2556 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,902 psi | 67% | 2523 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 38,522 psi | 60% | 2543 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 48,457 psi | 76% | 2657 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 48,327 psi | 76% | 2648 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 37,550 psi | 59% | 2536 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 37,014 psi | 58% | 2477 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 46,340 psi | 73% | 2585 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,308 psi | 66% | 2572 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 86% | 36,579 psi | 57% | 2461 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 53,417 psi | 84% | 2677 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,771 psi | 65% | 2575 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 32,982 psi | 52% | 2438 fps | 98.2% |
| Vihtavuori N560 | <<locked>> | 90% | 45,716 psi | 72% | 2730 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 96% | 45,295 psi | 71% | 2710 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,437 psi | 65% | 2539 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,366 psi | 68% | 2635 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,150 psi | 41% | 2346 fps | 97.7% |
| Winchester Supreme 780 | <<locked>> | 86% | 38,885 psi | 61% | 2513 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 86 powders for .338 Rem. Ultra Mag. loaded with the .338 | 215gr | Sierra GameKing. Winchester StaBALL HD delivers the highest muzzle velocity at 2,946 fps; across all powders the maximum-charge window runs from 1,765 fps to 2,946 fps. ADI AR 2225 gives the best case fill at 100 %, and 86 of the 86 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 215.0 gr projectile in 0.338" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-23, 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. Alliant Reloder-26, Accurate MAGPRO, Accurate High Country rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 215gr | Sierra GameKing 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.