Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 250gr | Hornady BTHP bullet and 80 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 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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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 3100 | <<locked>> | 96% | 56,072 psi | 88% | 2608 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 57,682 psi | 90% | 2641 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 54,563 psi | 86% | 2697 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 82% | 55,448 psi | 87% | 2559 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 54,607 psi | 86% | 2644 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 96% | 56,028 psi | 88% | 2700 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,833 psi | 73% | 2549 fps | 97.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,597 psi | 65% | 2516 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 54,998 psi | 86% | 2644 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,681 psi | 89% | 2579 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,694 psi | 86% | 2644 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,898 psi | 88% | 2657 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 54,317 psi | 85% | 2638 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,854 psi | 88% | 2694 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,884 psi | 89% | 2664 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,518 psi | 82% | 2674 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 57,566 psi | 90% | 2753 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 54,549 psi | 85% | 2608 fps | 96.3% |
| Bofors RP15 | <<locked>> | 98% | 54,781 psi | 86% | 2680 fps | 99.6% |
| Bofors RP3 | <<locked>> | 82% | 57,711 psi | 90% | 2595 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,588 psi | 76% | 2618 fps | 98.5% |
| Bofors RP5 | <<locked>> | 96% | 55,854 psi | 88% | 2694 fps | 99.7% |
| Bofors RP7 | <<locked>> | 86% | 56,608 psi | 89% | 2595 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,648 psi | 81% | 2628 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 86% | 55,637 psi | 87% | 2641 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 54,810 psi | 86% | 2605 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 94% | 56,086 psi | 88% | 2641 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 55,027 psi | 86% | 2628 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 55,085 psi | 86% | 2572 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,372 psi | 81% | 2733 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 86% | 56,188 psi | 88% | 2680 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,956 psi | 58% | 1624 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 54,607 psi | 86% | 2582 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,694 psi | 86% | 2569 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 54,317 psi | 85% | 2585 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 57,334 psi | 90% | 2628 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 98% | 57,566 psi | 90% | 2730 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 55,259 psi | 87% | 2569 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,797 psi | 89% | 2612 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,505 psi | 84% | 2575 fps | 100% |
| Norma 204 | <<locked>> | 88% | 55,477 psi | 87% | 2631 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 37,275 psi | 58% | 2451 fps | 97.7% |
| Norma MRP | <<locked>> | 94% | 55,651 psi | 87% | 2717 fps | 100% |
| Norma URP | <<locked>> | 88% | 56,072 psi | 88% | 2625 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,360 psi | 85% | 2697 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 88% | 54,868 psi | 86% | 2631 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,768 psi | 89% | 2690 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,797 psi | 59% | 1663 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,479 psi | 90% | 2605 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 55,405 psi | 87% | 2644 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,580 psi | 90% | 2664 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,985 psi | 88% | 2694 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 52,069 psi | 82% | 2730 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 46,876 psi | 73% | 2621 fps | 96.9% |
| Rottweil R 903 | <<locked>> | 82% | 54,418 psi | 85% | 2549 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,970 psi | 88% | 2615 fps | 99% |
| Rottweil R 905 | <<locked>> | 94% | 57,363 psi | 90% | 2674 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 86% | 56,608 psi | 89% | 2595 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,259 psi | 87% | 2569 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,797 psi | 89% | 2612 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,695 psi | 87% | 2598 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,505 psi | 85% | 2434 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,418 psi | 85% | 2523 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,913 psi | 89% | 2671 fps | 99.7% |
| Somchem S355 | <<locked>> | 84% | 57,609 psi | 90% | 2585 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 54,012 psi | 85% | 2559 fps | 98.2% |
| Somchem S365 | <<locked>> | 90% | 56,217 psi | 88% | 2628 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,172 psi | 85% | 2598 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 55,332 psi | 87% | 2516 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,331 psi | 85% | 2572 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 57,450 psi | 90% | 2628 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 57,159 psi | 90% | 2625 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 55,622 psi | 87% | 2644 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 55,579 psi | 87% | 2710 fps | 98.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 55,158 psi | 86% | 2690 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 48,182 psi | 76% | 2628 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 57,566 psi | 90% | 2579 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,840 psi | 88% | 2644 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 98% | 54,099 psi | 85% | 2740 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 53,998 psi | 85% | 2592 fps | 99.4% |
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% | 32,677 psi | 51% | 2221 fps | 97.3% |
| Accurate 4350 | <<locked>> | 80% | 43,947 psi | 69% | 2448 fps | 100% |
| Accurate MAGPRO | 80.8 gr | 88% | 44,135 psi | 69% | 2530 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 52,098 psi | 82% | 2513 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 36,738 psi | 58% | 2333 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 86% | 40,074 psi | 63% | 2428 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 94% | 38,435 psi | 60% | 2388 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 90% | 30,313 psi | 48% | 2247 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 37,057 psi | 58% | 2336 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,258 psi | 83% | 2533 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,148 psi | 66% | 2454 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,617 psi | 76% | 2559 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 36,724 psi | 58% | 2329 fps | 95.9% |
| Alliant Reloder-22 | <<locked>> | 82% | 34,882 psi | 55% | 2329 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,372 psi | 49% | 2251 fps | 99.6% |
| Alliant Reloder-25 | <<locked>> | 80% | 27,427 psi | 43% | 2162 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 34,084 psi | 53% | 2369 fps | 99% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 51,314 psi | 80% | 2559 fps | 95.5% |
| Bofors RP15 | <<locked>> | 84% | 34,708 psi | 54% | 2323 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 54,172 psi | 85% | 2549 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 37,072 psi | 58% | 2405 fps | 95.4% |
| Bofors RP5 | <<locked>> | 82% | 34,882 psi | 55% | 2329 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 46,876 psi | 73% | 2451 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 36,825 psi | 58% | 2359 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 45,629 psi | 72% | 2493 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 48,356 psi | 76% | 2507 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 86% | 42,844 psi | 67% | 2434 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 86% | 42,032 psi | 66% | 2418 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,697 psi | 62% | 2349 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 34,664 psi | 54% | 2392 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 44,947 psi | 70% | 2513 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,688 psi | 43% | 1453 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,395 psi | 66% | 2388 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,327 psi | 76% | 2474 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 42,003 psi | 66% | 2402 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 41,887 psi | 66% | 2385 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 86% | 38,435 psi | 60% | 2405 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 45,905 psi | 72% | 2428 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 44,266 psi | 69% | 2421 fps | 99.2% |
| Lovex S071 | <<locked>> | 80% | 28,123 psi | 44% | 2113 fps | 95.4% |
| Norma 204 | <<locked>> | 80% | 42,366 psi | 66% | 2425 fps | 97.4% |
| Norma 217 | <<locked>> | 96% | 32,706 psi | 51% | 2343 fps | 95.9% |
| Norma MRP | 72.1 gr | 80% | 33,982 psi | 53% | 2336 fps | 96.6% |
| Norma URP | <<locked>> | 80% | 43,308 psi | 68% | 2441 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 38,072 psi | 60% | 2411 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 42,105 psi | 66% | 2434 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 86% | 33,852 psi | 53% | 2303 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,210 psi | 44% | 1486 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,867 psi | 84% | 2556 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,576 psi | 81% | 2595 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,801 psi | 69% | 2467 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,076 psi | 66% | 2480 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 31,546 psi | 49% | 2310 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 43,468 psi | 68% | 2562 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 51,082 psi | 80% | 2503 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 38,130 psi | 60% | 2316 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 80% | 36,027 psi | 56% | 2316 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 80% | 46,876 psi | 73% | 2451 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,905 psi | 72% | 2428 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 44,266 psi | 69% | 2421 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,330 psi | 82% | 2556 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,111 psi | 80% | 2392 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,962 psi | 70% | 2385 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 35,723 psi | 56% | 2313 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 50,836 psi | 80% | 2500 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 41,394 psi | 65% | 2356 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 40,030 psi | 63% | 2398 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,695 psi | 57% | 2306 fps | 97% |
| Vihtavuori N150 | <<locked>> | 80% | 48,733 psi | 76% | 2431 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,614 psi | 70% | 2431 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 33,779 psi | 53% | 2238 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 44,034 psi | 69% | 2438 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 35,244 psi | 55% | 2320 fps | 99.5% |
| Vihtavuori N560 | 77.5 gr | 86% | 42,177 psi | 66% | 2490 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 90% | 39,334 psi | 62% | 2428 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 98% | 44,947 psi | 70% | 2572 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,714 psi | 69% | 2398 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,803 psi | 72% | 2497 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,876 psi | 44% | 2260 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 35,650 psi | 56% | 2283 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 80 powders for .338 Rem. Ultra Mag. loaded with the .338 | 250gr | Hornady BTHP. Alliant Reloder-26 delivers the highest muzzle velocity at 2,753 fps; across all powders the maximum-charge window runs from 1,624 fps to 2,753 fps. ADI AR 2217 gives the best case fill at 100 %, and 80 of the 80 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 1:12.5 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. Vihtavuori N560, Norma MRP, Accurate MAGPRO rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 250gr | Hornady BTHP 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.