Load Specifications
Load data in caliber .338 Norma Mag. with .338 | 250gr | Nosler Partition RN bullet and 75 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.
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% | 56,246 psi | 88% | 2608 fps | 99.9% |
| Accurate 3100 | <<locked>> | 94% | 55,753 psi | 87% | 2667 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 57,203 psi | 90% | 2697 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 55,027 psi | 86% | 2762 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 90% | 54,288 psi | 85% | 2700 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 55,651 psi | 87% | 2759 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,835 psi | 78% | 2664 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,440 psi | 70% | 2631 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,418 psi | 85% | 2697 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,376 psi | 87% | 2707 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,392 psi | 90% | 2743 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,680 psi | 87% | 2756 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,768 psi | 89% | 2723 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,173 psi | 88% | 2782 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,493 psi | 90% | 2812 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,159 psi | 90% | 2720 fps | 97.1% |
| Bofors RP15 | <<locked>> | 96% | 54,665 psi | 86% | 2740 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,127 psi | 82% | 2733 fps | 99.1% |
| Bofors RP5 | <<locked>> | 94% | 55,680 psi | 87% | 2756 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 55,825 psi | 87% | 2644 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,969 psi | 86% | 2746 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 55,129 psi | 86% | 2697 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 57,725 psi | 90% | 2707 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 92% | 55,593 psi | 87% | 2700 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,404 psi | 85% | 2684 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,723 psi | 86% | 2625 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,027 psi | 86% | 2854 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 55,390 psi | 87% | 2730 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,173 psi | 58% | 1667 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,392 psi | 90% | 2684 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,174 psi | 90% | 2667 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 57,392 psi | 90% | 2687 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,521 psi | 89% | 2684 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 96% | 57,334 psi | 90% | 2795 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 40,045 psi | 63% | 2539 fps | 96.4% |
| Lovex S065 | <<locked>> | 84% | 54,389 psi | 85% | 2615 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,028 psi | 88% | 2661 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,971 psi | 89% | 2684 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,752 psi | 86% | 2687 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 40,147 psi | 63% | 2566 fps | 98.6% |
| Norma MRP | <<locked>> | 92% | 55,550 psi | 87% | 2776 fps | 100% |
| Norma URP | <<locked>> | 86% | 55,477 psi | 87% | 2677 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 54,143 psi | 85% | 2759 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 54,346 psi | 85% | 2687 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,434 psi | 88% | 2753 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,000 psi | 60% | 1706 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 57,159 psi | 90% | 2717 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,448 psi | 87% | 2746 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,811 psi | 87% | 2854 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,633 psi | 79% | 2746 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 82% | 57,319 psi | 90% | 2641 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,376 psi | 87% | 2671 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 92% | 56,898 psi | 89% | 2733 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 55,825 psi | 87% | 2644 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,389 psi | 85% | 2615 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,028 psi | 88% | 2661 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,797 psi | 89% | 2516 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,159 psi | 90% | 2621 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,449 psi | 88% | 2726 fps | 99.8% |
| Somchem S355 | <<locked>> | 82% | 56,753 psi | 89% | 2635 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,942 psi | 89% | 2667 fps | 98.8% |
| Somchem S365 | <<locked>> | 88% | 55,970 psi | 88% | 2680 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,363 psi | 90% | 2703 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 54,592 psi | 86% | 2566 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 57,334 psi | 90% | 2671 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,927 psi | 89% | 2687 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 56,376 psi | 88% | 2677 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,593 psi | 87% | 2703 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,317 psi | 87% | 2772 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 98% | 55,085 psi | 86% | 2753 fps | 99% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,706 psi | 81% | 2749 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,782 psi | 89% | 2631 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,317 psi | 87% | 2700 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,679 psi | 86% | 2805 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,305 psi | 90% | 2703 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 2700 | <<locked>> | 80% | 52,779 psi | 83% | 2559 fps | 99.7% |
| Accurate 3100 | <<locked>> | 80% | 34,896 psi | 55% | 2313 fps | 98.1% |
| Accurate 4350 | <<locked>> | 80% | 46,702 psi | 73% | 2543 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 44,657 psi | 70% | 2589 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 38,885 psi | 61% | 2431 fps | 96.8% |
| ADI AR 2213 | <<locked>> | 84% | 39,726 psi | 62% | 2477 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 92% | 38,189 psi | 60% | 2441 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 88% | 30,226 psi | 47% | 2293 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,744 psi | 70% | 2549 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,721 psi | 81% | 2657 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,928 psi | 61% | 2428 fps | 96.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,737 psi | 54% | 2372 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,504 psi | 53% | 2339 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,167 psi | 46% | 2257 fps | 96.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,680 psi | 57% | 2470 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,560 psi | 79% | 2615 fps | 95.6% |
| Bofors RP15 | <<locked>> | 82% | 34,679 psi | 54% | 2369 fps | 95.3% |
| Bofors RP30 | <<locked>> | 90% | 37,130 psi | 58% | 2457 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 34,737 psi | 54% | 2372 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 49,168 psi | 77% | 2543 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 36,637 psi | 57% | 2408 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 48,341 psi | 76% | 2592 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 50,749 psi | 80% | 2602 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 84% | 42,409 psi | 66% | 2484 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,640 psi | 65% | 2467 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,206 psi | 66% | 2441 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 34,577 psi | 54% | 2444 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 47,863 psi | 75% | 2615 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,789 psi | 44% | 1486 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,657 psi | 70% | 2484 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,502 psi | 79% | 2566 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 44,353 psi | 70% | 2493 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 41,394 psi | 65% | 2428 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 84% | 38,247 psi | 60% | 2454 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 98% | 37,536 psi | 59% | 2484 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 48,182 psi | 76% | 2520 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,499 psi | 73% | 2513 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 30,168 psi | 47% | 2201 fps | 96.4% |
| Norma 204 | <<locked>> | 80% | 44,657 psi | 70% | 2520 fps | 98.1% |
| Norma 217 | <<locked>> | 92% | 30,864 psi | 48% | 2339 fps | 95% |
| Norma MRP | 77.6 gr | 80% | 36,448 psi | 57% | 2438 fps | 97.6% |
| Norma URP | <<locked>> | 80% | 45,730 psi | 72% | 2533 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 37,884 psi | 59% | 2461 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 44,512 psi | 70% | 2530 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 84% | 33,765 psi | 53% | 2349 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,471 psi | 45% | 1522 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,644 psi | 73% | 2566 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,802 psi | 70% | 2582 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 31,517 psi | 49% | 2359 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 43,439 psi | 68% | 2618 fps | 96% |
| Rottweil R 903 | <<locked>> | 80% | 53,650 psi | 84% | 2595 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 40,335 psi | 63% | 2415 fps | 96% |
| Rottweil R 905 | <<locked>> | 80% | 38,363 psi | 60% | 2415 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 80% | 49,168 psi | 77% | 2543 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,182 psi | 76% | 2520 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,499 psi | 73% | 2513 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,548 psi | 84% | 2477 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,166 psi | 74% | 2474 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,029 psi | 60% | 2408 fps | 96.7% |
| Somchem S355 | <<locked>> | 80% | 53,374 psi | 84% | 2589 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 40,959 psi | 64% | 2402 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 42,786 psi | 67% | 2490 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,827 psi | 61% | 2398 fps | 97.7% |
| Vihtavuori N150 | <<locked>> | 80% | 51,111 psi | 80% | 2516 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,152 psi | 74% | 2523 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,634 psi | 53% | 2280 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 46,456 psi | 73% | 2526 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,695 psi | 59% | 2411 fps | 99.8% |
| Vihtavuori N560 | 79.5 gr | 82% | 39,204 psi | 61% | 2484 fps | 95% |
| Vihtavuori N565 | <<locked>> | 88% | 39,349 psi | 62% | 2477 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 96% | 44,875 psi | 70% | 2628 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,224 psi | 72% | 2487 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,341 psi | 76% | 2592 fps | 99.7% |
| Winchester StaBALL HD | 76.7 gr | 80% | 29,747 psi | 47% | 2359 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,418 psi | 56% | 2326 fps | 95.7% |
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 79 powders for .338 Norma Mag. loaded with the .338 | 250gr | Nosler Partition RN. Hodgdon Retumbo delivers the highest muzzle velocity at 2,854 fps; across all powders the maximum-charge window runs from 1,667 fps to 2,854 fps. ADI AR 2217 gives the best case fill at 100 %, and 79 of the 79 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 1:15.5 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. Winchester StaBALL HD, Vihtavuori N560, Norma MRP rank at the top here: for .338 Norma Mag. with the .338 | 250gr | Nosler Partition RN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.