Load Specifications
Load data in caliber .338 Norma Mag. with .338 | 250gr | Swift A-Frame bullet and 78 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>> | 96% | 57,609 psi | 90% | 2684 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,376 psi | 87% | 2664 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 55,216 psi | 87% | 2776 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 94% | 55,999 psi | 88% | 2779 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 82% | 56,463 psi | 88% | 2621 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,159 psi | 88% | 2720 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 96% | 57,406 psi | 90% | 2776 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,051 psi | 75% | 2625 fps | 98.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,786 psi | 67% | 2592 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 56,260 psi | 88% | 2717 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,144 psi | 88% | 2717 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 57,435 psi | 90% | 2730 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,564 psi | 87% | 2710 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 96% | 57,276 psi | 90% | 2772 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 54,766 psi | 86% | 2690 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,954 psi | 85% | 2749 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 54,998 psi | 86% | 2776 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 55,651 psi | 87% | 2687 fps | 96.5% |
| Bofors RP15 | <<locked>> | 98% | 56,217 psi | 88% | 2756 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,024 psi | 78% | 2694 fps | 98.7% |
| Bofors RP5 | <<locked>> | 96% | 57,276 psi | 90% | 2772 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 54,346 psi | 85% | 2615 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,040 psi | 83% | 2710 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 86% | 57,014 psi | 89% | 2717 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 56,130 psi | 88% | 2677 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 94% | 57,537 psi | 90% | 2720 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,260 psi | 88% | 2703 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,565 psi | 89% | 2641 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,939 psi | 83% | 2815 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 57,522 psi | 90% | 2753 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,144 psi | 58% | 1654 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,883 psi | 88% | 2654 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,811 psi | 87% | 2638 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 55,738 psi | 87% | 2657 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,056 psi | 86% | 2654 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 96% | 55,288 psi | 87% | 2756 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 56,333 psi | 88% | 2635 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 54,621 psi | 86% | 2635 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,897 psi | 86% | 2648 fps | 100% |
| Norma 204 | <<locked>> | 88% | 56,797 psi | 89% | 2707 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 38,348 psi | 60% | 2523 fps | 97.9% |
| Norma MRP | <<locked>> | 94% | 57,276 psi | 90% | 2795 fps | 100% |
| Norma URP | <<locked>> | 88% | 57,334 psi | 90% | 2697 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,912 psi | 88% | 2776 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 88% | 56,231 psi | 88% | 2703 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 54,056 psi | 85% | 2713 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,985 psi | 60% | 1693 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,956 psi | 89% | 2713 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,317 psi | 87% | 2687 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 57,508 psi | 90% | 2766 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,505 psi | 84% | 2815 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 48,240 psi | 76% | 2700 fps | 97.1% |
| Rottweil R 903 | <<locked>> | 82% | 55,680 psi | 87% | 2615 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 57,261 psi | 90% | 2687 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 92% | 55,100 psi | 86% | 2700 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 54,346 psi | 85% | 2615 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,333 psi | 88% | 2635 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 54,621 psi | 86% | 2635 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,087 psi | 89% | 2667 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,608 psi | 87% | 2493 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,709 psi | 87% | 2595 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 54,694 psi | 86% | 2694 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 55,361 psi | 87% | 2608 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,274 psi | 87% | 2631 fps | 98.4% |
| Somchem S365 | <<locked>> | 88% | 54,157 psi | 85% | 2651 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 55,535 psi | 87% | 2671 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 56,536 psi | 89% | 2582 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,666 psi | 87% | 2641 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,042 psi | 86% | 2654 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 54,839 psi | 86% | 2648 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 57,072 psi | 89% | 2717 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 57,130 psi | 90% | 2792 fps | 99% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 56,797 psi | 89% | 2772 fps | 99.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 49,559 psi | 78% | 2707 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,027 psi | 86% | 2602 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 57,217 psi | 90% | 2720 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 98% | 56,173 psi | 88% | 2822 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 55,361 psi | 87% | 2667 fps | 99.5% |
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% | 33,721 psi | 53% | 2283 fps | 97.6% |
| Accurate 4350 | <<locked>> | 80% | 45,223 psi | 71% | 2513 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 39,001 psi | 61% | 2487 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 86% | 42,380 psi | 66% | 2546 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 53,185 psi | 83% | 2579 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 37,739 psi | 59% | 2398 fps | 96.2% |
| ADI AR 2213 | <<locked>> | 86% | 41,046 psi | 64% | 2497 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 94% | 39,508 psi | 62% | 2461 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 90% | 31,053 psi | 49% | 2313 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,087 psi | 60% | 2402 fps | 96.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,294 psi | 68% | 2520 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,893 psi | 78% | 2628 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 37,739 psi | 59% | 2395 fps | 96.3% |
| Alliant Reloder-22 | <<locked>> | 82% | 35,926 psi | 56% | 2395 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,300 psi | 51% | 2310 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,224 psi | 44% | 2224 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,186 psi | 55% | 2438 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 52,330 psi | 82% | 2631 fps | 95.8% |
| Bofors RP15 | <<locked>> | 84% | 35,723 psi | 56% | 2388 fps | 95.5% |
| Bofors RP30 | <<locked>> | 92% | 38,159 psi | 60% | 2474 fps | 95.8% |
| Bofors RP5 | <<locked>> | 82% | 35,926 psi | 56% | 2395 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 48,066 psi | 75% | 2516 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 90% | 37,797 psi | 59% | 2428 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 46,862 psi | 73% | 2559 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 80% | 49,429 psi | 77% | 2572 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 84% | 41,017 psi | 64% | 2448 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 84% | 40,292 psi | 63% | 2434 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,814 psi | 64% | 2411 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 33,402 psi | 52% | 2405 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 46,180 psi | 72% | 2582 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,789 psi | 44% | 1476 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,453 psi | 68% | 2454 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,269 psi | 77% | 2536 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 43,018 psi | 67% | 2464 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 40,190 psi | 63% | 2398 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 86% | 39,450 psi | 62% | 2474 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 46,891 psi | 73% | 2493 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 45,223 psi | 71% | 2484 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 29,095 psi | 46% | 2172 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 43,323 psi | 68% | 2487 fps | 97.6% |
| Norma 217 | <<locked>> | 94% | 31,560 psi | 49% | 2356 fps | 95.1% |
| Norma MRP | 75.2 gr | 80% | 35,012 psi | 55% | 2402 fps | 96.9% |
| Norma URP | <<locked>> | 80% | 44,353 psi | 70% | 2500 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 39,160 psi | 61% | 2484 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 43,076 psi | 68% | 2500 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 84% | 32,474 psi | 51% | 2313 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,456 psi | 45% | 1512 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,982 psi | 83% | 2664 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,005 psi | 71% | 2533 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,279 psi | 68% | 2549 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 32,503 psi | 51% | 2382 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 41,582 psi | 65% | 2575 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 52,170 psi | 82% | 2569 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 39,146 psi | 61% | 2382 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 80% | 36,970 psi | 58% | 2379 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 80% | 48,066 psi | 75% | 2516 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,891 psi | 73% | 2493 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 45,223 psi | 71% | 2484 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,417 psi | 84% | 2621 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,330 psi | 82% | 2454 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,818 psi | 72% | 2444 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 36,651 psi | 57% | 2375 fps | 96.1% |
| Somchem S355 | <<locked>> | 80% | 51,982 psi | 81% | 2562 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 42,424 psi | 66% | 2421 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 41,307 psi | 65% | 2464 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,652 psi | 59% | 2369 fps | 97.3% |
| Vihtavuori N150 | <<locked>> | 80% | 49,734 psi | 78% | 2493 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,788 psi | 72% | 2497 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 32,547 psi | 51% | 2251 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 45,194 psi | 71% | 2503 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 36,318 psi | 57% | 2379 fps | 99.7% |
| Vihtavuori N560 | 79 gr | 84% | 40,538 psi | 64% | 2507 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 90% | 40,451 psi | 63% | 2493 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 96% | 43,091 psi | 68% | 2589 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,802 psi | 70% | 2461 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,862 psi | 73% | 2559 fps | 99.5% |
| Winchester StaBALL HD | 74.4 gr | 80% | 28,631 psi | 45% | 2323 fps | 99.8% |
| Winchester Supreme 780 | <<locked>> | 80% | 34,229 psi | 54% | 2293 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 78 powders for .338 Norma Mag. loaded with the .338 | 250gr | Swift A-Frame. Winchester StaBALL HD delivers the highest muzzle velocity at 2,822 fps; across all powders the maximum-charge window runs from 1,654 fps to 2,822 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 | Swift A-Frame 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.