Load Specifications
Load data in caliber .338 Norma Mag. with .338 | 250gr | Nosler Partition 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 55,201 psi | 87% | 2657 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,797 psi | 89% | 2687 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 57,711 psi | 90% | 2808 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 82% | 57,638 psi | 90% | 2644 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,334 psi | 90% | 2743 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 94% | 55,158 psi | 86% | 2749 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,443 psi | 77% | 2657 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,077 psi | 69% | 2621 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,580 psi | 90% | 2740 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,984 psi | 86% | 2700 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,884 psi | 89% | 2733 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,143 psi | 86% | 2746 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,449 psi | 88% | 2717 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,651 psi | 87% | 2776 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,942 psi | 89% | 2805 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 56,826 psi | 89% | 2713 fps | 97% |
| Bofors RP15 | <<locked>> | 98% | 57,725 psi | 90% | 2782 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,663 psi | 81% | 2723 fps | 99% |
| Bofors RP5 | <<locked>> | 94% | 55,143 psi | 86% | 2746 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 55,405 psi | 87% | 2638 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,534 psi | 85% | 2740 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 54,592 psi | 86% | 2687 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 57,363 psi | 90% | 2700 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 92% | 55,085 psi | 86% | 2694 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,725 psi | 90% | 2730 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,711 psi | 90% | 2661 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,534 psi | 85% | 2844 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 54,839 psi | 86% | 2723 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,217 psi | 58% | 1663 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,029 psi | 89% | 2674 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,826 psi | 89% | 2657 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 57,014 psi | 89% | 2680 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,028 psi | 88% | 2674 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 96% | 56,811 psi | 89% | 2785 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 39,639 psi | 62% | 2530 fps | 96.2% |
| Lovex S065 | <<locked>> | 86% | 57,406 psi | 90% | 2654 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,651 psi | 87% | 2654 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,420 psi | 88% | 2674 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,433 psi | 85% | 2677 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 39,711 psi | 62% | 2556 fps | 98.4% |
| Norma MRP | <<locked>> | 92% | 54,998 psi | 86% | 2766 fps | 100% |
| Norma URP | <<locked>> | 86% | 55,071 psi | 86% | 2671 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,667 psi | 90% | 2805 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 88% | 57,638 psi | 90% | 2730 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 55,753 psi | 87% | 2740 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,058 psi | 60% | 1703 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,782 psi | 89% | 2710 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,839 psi | 86% | 2736 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,216 psi | 87% | 2844 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 49,995 psi | 78% | 2736 fps | 97.7% |
| Rottweil R 903 | <<locked>> | 82% | 56,884 psi | 89% | 2635 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,027 psi | 86% | 2664 fps | 99% |
| Rottweil R 905 | <<locked>> | 92% | 56,521 psi | 89% | 2726 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 55,405 psi | 87% | 2638 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,406 psi | 90% | 2654 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,651 psi | 87% | 2654 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,594 psi | 89% | 2510 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,652 psi | 89% | 2615 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,072 psi | 88% | 2720 fps | 99.7% |
| Somchem S355 | <<locked>> | 82% | 56,333 psi | 88% | 2628 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,507 psi | 89% | 2657 fps | 98.7% |
| Somchem S365 | <<locked>> | 88% | 55,593 psi | 87% | 2674 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,884 psi | 89% | 2697 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 57,682 psi | 90% | 2602 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,913 psi | 89% | 2664 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,449 psi | 88% | 2677 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 56,028 psi | 88% | 2671 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,998 psi | 86% | 2694 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,795 psi | 86% | 2762 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 98% | 54,636 psi | 86% | 2746 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,227 psi | 80% | 2740 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,289 psi | 88% | 2625 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,781 psi | 86% | 2690 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,099 psi | 85% | 2795 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,826 psi | 89% | 2694 fps | 99.7% |
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% | 34,577 psi | 54% | 2306 fps | 97.9% |
| Accurate 4350 | <<locked>> | 80% | 46,267 psi | 73% | 2536 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 43,642 psi | 68% | 2575 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 54,157 psi | 85% | 2598 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,551 psi | 60% | 2421 fps | 96.6% |
| ADI AR 2213 | <<locked>> | 84% | 39,407 psi | 62% | 2467 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 92% | 37,942 psi | 59% | 2431 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 90% | 31,908 psi | 50% | 2339 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,324 psi | 69% | 2539 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,111 psi | 80% | 2648 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,580 psi | 60% | 2418 fps | 96.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,403 psi | 54% | 2362 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,156 psi | 52% | 2329 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,877 psi | 45% | 2247 fps | 96.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,303 psi | 57% | 2464 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,227 psi | 79% | 2608 fps | 95.4% |
| Bofors RP15 | <<locked>> | 82% | 34,345 psi | 54% | 2359 fps | 95.1% |
| Bofors RP30 | <<locked>> | 90% | 36,811 psi | 58% | 2448 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 34,403 psi | 54% | 2362 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 48,950 psi | 77% | 2539 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 36,260 psi | 57% | 2398 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 47,964 psi | 75% | 2585 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 50,357 psi | 79% | 2595 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 84% | 42,061 psi | 66% | 2474 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,336 psi | 65% | 2457 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,814 psi | 66% | 2431 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 34,330 psi | 54% | 2434 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 47,500 psi | 74% | 2608 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,775 psi | 44% | 1483 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,295 psi | 69% | 2477 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,314 psi | 79% | 2562 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 44,121 psi | 69% | 2487 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 41,089 psi | 64% | 2421 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 84% | 37,913 psi | 59% | 2444 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 98% | 37,144 psi | 58% | 2474 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 47,776 psi | 75% | 2513 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,108 psi | 72% | 2507 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 29,805 psi | 47% | 2192 fps | 96.2% |
| Norma 204 | <<locked>> | 80% | 44,309 psi | 69% | 2513 fps | 98% |
| Norma 217 | <<locked>> | 94% | 32,532 psi | 51% | 2385 fps | 95.8% |
| Norma MRP | 76.9 gr | 80% | 35,955 psi | 56% | 2428 fps | 97.4% |
| Norma URP | <<locked>> | 80% | 45,339 psi | 71% | 2523 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 37,449 psi | 59% | 2451 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 44,106 psi | 69% | 2523 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 33,344 psi | 52% | 2339 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,442 psi | 45% | 1522 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,267 psi | 73% | 2556 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,280 psi | 69% | 2572 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 31,154 psi | 49% | 2349 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 43,047 psi | 67% | 2608 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 53,243 psi | 83% | 2585 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 39,987 psi | 63% | 2405 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 37,985 psi | 60% | 2405 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 80% | 48,950 psi | 77% | 2539 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,776 psi | 75% | 2513 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,108 psi | 72% | 2507 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,142 psi | 83% | 2467 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,775 psi | 73% | 2467 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,681 psi | 59% | 2402 fps | 96.5% |
| Somchem S355 | <<locked>> | 80% | 52,982 psi | 83% | 2582 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 40,538 psi | 64% | 2392 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 42,351 psi | 66% | 2484 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,479 psi | 60% | 2388 fps | 97.6% |
| Vihtavuori N150 | <<locked>> | 80% | 50,705 psi | 79% | 2510 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,746 psi | 73% | 2516 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,330 psi | 52% | 2270 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 46,079 psi | 72% | 2520 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,304 psi | 58% | 2402 fps | 99.8% |
| Vihtavuori N560 | 80.8 gr | 84% | 41,611 psi | 65% | 2533 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 88% | 38,914 psi | 61% | 2467 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 96% | 44,425 psi | 70% | 2618 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,759 psi | 72% | 2480 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,964 psi | 75% | 2585 fps | 99.6% |
| Winchester StaBALL HD | 76.1 gr | 80% | 29,472 psi | 46% | 2352 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,114 psi | 55% | 2320 fps | 95.5% |
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. Hodgdon Retumbo delivers the highest muzzle velocity at 2,844 fps; across all powders the maximum-charge window runs from 1,663 fps to 2,844 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 1:15.0 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 Norma Mag. with the .338 | 250gr | Nosler Partition 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.