Load Specifications
Load data in caliber .338 Norma Mag. with .338 | 250gr | Norma GTX bullet and 82 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Norma MRP and Vihtavuori N560.
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% | 55,027 psi | 86% | 2644 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 56,884 psi | 89% | 2677 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 56,594 psi | 89% | 2789 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 96% | 57,435 psi | 90% | 2792 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 82% | 54,824 psi | 86% | 2592 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,624 psi | 90% | 2733 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 96% | 55,056 psi | 86% | 2733 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,151 psi | 72% | 2582 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,915 psi | 64% | 2546 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 57,711 psi | 90% | 2726 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,956 psi | 88% | 2612 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,624 psi | 90% | 2726 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,100 psi | 86% | 2694 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,956 psi | 89% | 2720 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,781 psi | 86% | 2730 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,782 psi | 87% | 2700 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,416 psi | 81% | 2707 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,217 psi | 88% | 2789 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 57,217 psi | 90% | 2697 fps | 96.6% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,522 psi | 90% | 2769 fps | 99.7% |
| Bofors RP3 | <<locked>> | 82% | 57,116 psi | 90% | 2631 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,471 psi | 74% | 2648 fps | 98.1% |
| Bofors RP5 | <<locked>> | 96% | 54,781 psi | 86% | 2730 fps | 99.6% |
| Bofors RP7 | <<locked>> | 86% | 56,043 psi | 88% | 2628 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,850 psi | 80% | 2664 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 82% | 57,029 psi | 89% | 2648 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,926 psi | 86% | 2680 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 54,244 psi | 85% | 2638 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 94% | 55,172 psi | 86% | 2677 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,114 psi | 85% | 2661 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,375 psi | 85% | 2608 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,531 psi | 79% | 2766 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 86% | 55,187 psi | 86% | 2717 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,028 psi | 58% | 1640 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,740 psi | 90% | 2618 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,334 psi | 90% | 2664 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,566 psi | 90% | 2651 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 57,072 psi | 89% | 2667 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,536 psi | 89% | 2664 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 98% | 56,463 psi | 88% | 2766 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 54,505 psi | 85% | 2598 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,101 psi | 88% | 2644 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,533 psi | 82% | 2612 fps | 100% |
| Norma 204 | <<locked>> | 88% | 54,708 psi | 86% | 2667 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 36,448 psi | 57% | 2474 fps | 97.1% |
| Norma MRP | <<locked>> | 94% | 54,723 psi | 86% | 2753 fps | 100% |
| Norma URP | <<locked>> | 88% | 55,332 psi | 87% | 2664 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 57,261 psi | 90% | 2785 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 88% | 54,070 psi | 85% | 2671 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,361 psi | 87% | 2723 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,710 psi | 59% | 1677 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,884 psi | 89% | 2641 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,592 psi | 86% | 2680 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,869 psi | 89% | 2700 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,013 psi | 86% | 2730 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,763 psi | 80% | 2762 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 45,788 psi | 72% | 2651 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 84% | 57,203 psi | 90% | 2628 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,201 psi | 87% | 2651 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 94% | 56,449 psi | 88% | 2710 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 86% | 56,043 psi | 88% | 2628 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,505 psi | 85% | 2598 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,101 psi | 88% | 2644 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,071 psi | 86% | 2635 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,392 psi | 90% | 2507 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,450 psi | 90% | 2608 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,999 psi | 88% | 2707 fps | 99.6% |
| Somchem S355 | <<locked>> | 84% | 56,840 psi | 89% | 2621 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,898 psi | 89% | 2648 fps | 98.4% |
| Somchem S365 | <<locked>> | 90% | 55,347 psi | 87% | 2664 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,014 psi | 89% | 2684 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 54,592 psi | 86% | 2549 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,203 psi | 90% | 2654 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,405 psi | 88% | 2664 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 56,391 psi | 88% | 2661 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,752 psi | 86% | 2680 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,694 psi | 86% | 2749 fps | 98.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,085 psi | 85% | 2726 fps | 98.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,652 psi | 89% | 2618 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,129 psi | 86% | 2680 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 56,753 psi | 89% | 2828 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,884 psi | 89% | 2680 fps | 99.6% |
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% | 32,300 psi | 51% | 2247 fps | 96.9% |
| Accurate 4350 | <<locked>> | 80% | 43,482 psi | 68% | 2480 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 39,943 psi | 63% | 2503 fps | 95.7% |
| Accurate MAGPRO | 81.2 gr | 88% | 43,323 psi | 68% | 2556 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 51,547 psi | 81% | 2546 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 36,347 psi | 57% | 2362 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 86% | 39,537 psi | 62% | 2457 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 96% | 40,379 psi | 63% | 2470 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 92% | 31,749 psi | 50% | 2323 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 36,680 psi | 57% | 2365 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,620 psi | 82% | 2569 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,568 psi | 65% | 2484 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,747 psi | 75% | 2592 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 36,361 psi | 57% | 2359 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 84% | 36,724 psi | 58% | 2408 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,879 psi | 48% | 2274 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 80% | 27,108 psi | 42% | 2185 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,518 psi | 53% | 2395 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 50,560 psi | 79% | 2592 fps | 95% |
| Bofors RP15 | <<locked>> | 86% | 36,405 psi | 57% | 2398 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 53,417 psi | 84% | 2582 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 38,812 psi | 61% | 2484 fps | 95.8% |
| Bofors RP5 | <<locked>> | 84% | 36,724 psi | 58% | 2408 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 46,528 psi | 73% | 2484 fps | 99% |
| Hodgdon H1000 | <<locked>> | 92% | 38,856 psi | 61% | 2441 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 53,592 psi | 84% | 2602 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,136 psi | 71% | 2523 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 47,732 psi | 75% | 2536 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 86% | 42,279 psi | 66% | 2464 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 86% | 41,452 psi | 65% | 2448 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,291 psi | 62% | 2379 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 34,156 psi | 54% | 2418 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 44,251 psi | 69% | 2543 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,673 psi | 43% | 1463 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 54,259 psi | 85% | 2575 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,032 psi | 66% | 2421 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,776 psi | 75% | 2503 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 41,379 psi | 65% | 2428 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 41,307 psi | 65% | 2408 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 88% | 40,451 psi | 63% | 2487 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 45,353 psi | 71% | 2457 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 43,714 psi | 69% | 2451 fps | 99% |
| Lovex S071 | <<locked>> | 80% | 27,804 psi | 44% | 2136 fps | 95% |
| Norma 204 | <<locked>> | 80% | 41,713 psi | 65% | 2451 fps | 97% |
| Norma 217 | <<locked>> | 96% | 32,053 psi | 50% | 2365 fps | 95.2% |
| Norma MRP | 72.5 gr | 80% | 33,518 psi | 53% | 2362 fps | 96.2% |
| Norma URP | <<locked>> | 80% | 42,714 psi | 67% | 2467 fps | 99.9% |
| Ramshot Grand | <<locked>> | 88% | 40,205 psi | 63% | 2497 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 41,466 psi | 65% | 2461 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 86% | 33,286 psi | 52% | 2326 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,340 psi | 44% | 1499 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,142 psi | 83% | 2585 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,676 psi | 79% | 2628 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,236 psi | 68% | 2497 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,481 psi | 65% | 2510 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 33,243 psi | 52% | 2395 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 42,511 psi | 67% | 2589 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 50,386 psi | 79% | 2536 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 40,277 psi | 63% | 2395 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 80% | 35,505 psi | 56% | 2343 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 46,528 psi | 73% | 2484 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,353 psi | 71% | 2457 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 43,714 psi | 69% | 2451 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,561 psi | 81% | 2585 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,792 psi | 80% | 2425 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,425 psi | 70% | 2411 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 35,186 psi | 55% | 2336 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 50,227 psi | 79% | 2530 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 43,758 psi | 69% | 2438 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 39,566 psi | 62% | 2428 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,114 psi | 57% | 2329 fps | 96.6% |
| Vihtavuori N150 | <<locked>> | 80% | 48,109 psi | 75% | 2464 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,193 psi | 69% | 2464 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 33,359 psi | 52% | 2264 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 43,540 psi | 68% | 2467 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 34,679 psi | 54% | 2343 fps | 99.4% |
| Vihtavuori N560 | 77.9 gr | 86% | 41,481 psi | 65% | 2520 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 92% | 41,191 psi | 65% | 2503 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,004 psi | 67% | 2428 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,136 psi | 71% | 2523 fps | 99.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,398 psi | 43% | 2280 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 35,186 psi | 55% | 2310 fps | 95.1% |
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 82 powders for .338 Norma Mag. loaded with the .338 | 250gr | Norma GTX. Winchester StaBALL HD delivers the highest muzzle velocity at 2,828 fps; across all powders the maximum-charge window runs from 1,640 fps to 2,828 fps. ADI AR 2217 gives the best case fill at 100 %, and 82 of the 82 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, 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. Accurate MAGPRO, Norma MRP, Vihtavuori N560 rank at the top here: for .338 Norma Mag. with the .338 | 250gr | Norma GTX 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.