Load Specifications
Load data in caliber .338 Norma Mag. with .338 | 225gr | Barnes MRX BT bullet and 86 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and Alliant Reloder-26.
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 2700 | <<locked>> | 82% | 56,304 psi | 88% | 2746 fps | 99.5% |
| Accurate 3100 | <<locked>> | 98% | 55,477 psi | 87% | 2795 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 55,608 psi | 87% | 2717 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,377 psi | 90% | 2838 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 54,143 psi | 85% | 2884 fps | 97% |
| ADI AR 2208 | <<locked>> | 84% | 55,724 psi | 87% | 2756 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,549 psi | 85% | 2835 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 98% | 55,956 psi | 88% | 2890 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,392 psi | 60% | 2612 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,710 psi | 89% | 2776 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,985 psi | 89% | 2802 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 54,592 psi | 86% | 2841 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,738 psi | 87% | 2858 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 57,696 psi | 90% | 2877 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,376 psi | 87% | 2884 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,217 psi | 88% | 2858 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,515 psi | 76% | 2802 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,782 psi | 89% | 2949 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,288 psi | 85% | 2867 fps | 98.9% |
| Bofors RP3 | <<locked>> | 84% | 57,682 psi | 90% | 2792 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 44,353 psi | 70% | 2726 fps | 96.5% |
| Bofors RP5 | <<locked>> | 98% | 55,376 psi | 87% | 2884 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 56,782 psi | 89% | 2789 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,993 psi | 75% | 2749 fps | 97.5% |
| Hodgdon H380 | <<locked>> | 82% | 54,288 psi | 85% | 2762 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,622 psi | 87% | 2838 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 86% | 55,245 psi | 87% | 2799 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 96% | 56,246 psi | 88% | 2835 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,998 psi | 86% | 2815 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,766 psi | 86% | 2762 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,543 psi | 75% | 2851 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 88% | 56,231 psi | 88% | 2877 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,680 psi | 57% | 1742 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,245 psi | 87% | 2740 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,624 psi | 90% | 2776 fps | 99.8% |
| IMR 4350 | <<locked>> | 90% | 54,694 psi | 86% | 2772 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,129 psi | 86% | 2762 fps | 99.7% |
| IMR 4831 | <<locked>> | 92% | 57,638 psi | 90% | 2828 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,522 psi | 90% | 2822 fps | 98% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,406 psi | 90% | 2923 fps | 98.6% |
| Lovex S062 | <<locked>> | 82% | 55,347 psi | 87% | 2730 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,259 psi | 87% | 2759 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,753 psi | 89% | 2802 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,110 psi | 77% | 2703 fps | 99.6% |
| Norma 203B | <<locked>> | 82% | 56,289 psi | 88% | 2785 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,506 psi | 87% | 2825 fps | 98.9% |
| Norma MRP | <<locked>> | 96% | 55,085 psi | 86% | 2907 fps | 99.8% |
| Norma URP | <<locked>> | 90% | 55,970 psi | 88% | 2822 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,217 psi | 90% | 2812 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,085 psi | 85% | 2881 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 90% | 54,665 psi | 86% | 2825 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,982 psi | 81% | 2815 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,405 psi | 59% | 1781 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,215 psi | 85% | 2749 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,201 psi | 87% | 2848 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,421 psi | 90% | 2861 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,782 psi | 87% | 2890 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,659 psi | 75% | 2844 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 82% | 57,232 psi | 90% | 2740 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,740 psi | 90% | 2789 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,159 psi | 88% | 2805 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 96% | 57,159 psi | 90% | 2867 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 88% | 56,782 psi | 89% | 2789 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,259 psi | 87% | 2759 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,347 psi | 87% | 2730 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,753 psi | 89% | 2802 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,970 psi | 88% | 2802 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,868 psi | 86% | 2625 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,708 psi | 86% | 2713 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,695 psi | 89% | 2861 fps | 99.3% |
| Somchem S355 | <<locked>> | 86% | 57,624 psi | 90% | 2785 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,244 psi | 85% | 2746 fps | 97.3% |
| Somchem S365 | <<locked>> | 92% | 55,709 psi | 87% | 2822 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 57,595 psi | 90% | 2838 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 86% | 55,303 psi | 87% | 2710 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,215 psi | 85% | 2762 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,116 psi | 90% | 2818 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 82% | 56,173 psi | 88% | 2710 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,913 psi | 89% | 2818 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 54,810 psi | 86% | 2831 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,143 psi | 86% | 2897 fps | 97.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 50,734 psi | 80% | 2812 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,725 psi | 90% | 2779 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,840 psi | 88% | 2841 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 52,779 psi | 83% | 2933 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 53,925 psi | 85% | 2779 fps | 98.8% |
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% | 52,678 psi | 83% | 2690 fps | 99.1% |
| Accurate 3100 | <<locked>> | 82% | 31,778 psi | 50% | 2356 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 52,112 psi | 82% | 2671 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,335 psi | 63% | 2562 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 92% | 46,833 psi | 73% | 2759 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 49,255 psi | 77% | 2657 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 39,131 psi | 61% | 2549 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 92% | 45,600 psi | 71% | 2710 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 96% | 33,649 psi | 53% | 2490 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,922 psi | 78% | 2677 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,287 psi | 84% | 2746 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,160 psi | 61% | 2572 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,976 psi | 70% | 2694 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 38,928 psi | 61% | 2543 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 88% | 39,305 psi | 62% | 2592 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,616 psi | 45% | 2333 fps | 98% |
| Alliant Reloder-25 | <<locked>> | 86% | 30,574 psi | 48% | 2402 fps | 95.6% |
| Alliant Reloder-26 | 78.5 gr | 80% | 30,835 psi | 48% | 2448 fps | 96.7% |
| Bofors RP15 | <<locked>> | 90% | 38,914 psi | 61% | 2582 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 50,401 psi | 79% | 2690 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 41,423 psi | 65% | 2667 fps | 95.6% |
| Bofors RP5 | <<locked>> | 88% | 39,305 psi | 62% | 2592 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 44,106 psi | 69% | 2575 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 96% | 41,800 psi | 66% | 2628 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 50,734 psi | 80% | 2707 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,409 psi | 66% | 2612 fps | 98% |
| Hodgdon H4350 | <<locked>> | 80% | 45,281 psi | 71% | 2631 fps | 97.5% |
| Hodgdon H4831 | <<locked>> | 90% | 45,658 psi | 72% | 2657 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 44,657 psi | 70% | 2641 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,651 psi | 57% | 2464 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 94% | 38,899 psi | 61% | 2657 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 41,568 psi | 65% | 2628 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 43% | 1555 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,808 psi | 81% | 2687 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,954 psi | 85% | 2723 fps | 99.6% |
| IMR 4350 | <<locked>> | 80% | 39,668 psi | 62% | 2507 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,643 psi | 72% | 2608 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 38,667 psi | 61% | 2513 fps | 99.2% |
| IMR 4955 Enduron | <<locked>> | 88% | 44,527 psi | 70% | 2602 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 92% | 43,540 psi | 68% | 2680 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 51,924 psi | 81% | 2680 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,888 psi | 67% | 2552 fps | 99% |
| Lovex S070 | <<locked>> | 80% | 41,147 psi | 64% | 2536 fps | 97.8% |
| Lovex S071 | <<locked>> | 86% | 30,922 psi | 48% | 2336 fps | 95.3% |
| Norma 203B | <<locked>> | 80% | 52,620 psi | 82% | 2733 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,320 psi | 62% | 2533 fps | 95.3% |
| Norma MRP | 80 gr | 84% | 35,810 psi | 56% | 2543 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 40,059 psi | 63% | 2556 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 80% | 53,519 psi | 84% | 2759 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 43,395 psi | 68% | 2690 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 38,943 psi | 61% | 2546 fps | 97.9% |
| Ramshot Magnum | <<locked>> | 90% | 35,752 psi | 56% | 2507 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,891 psi | 44% | 1591 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,749 psi | 80% | 2694 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,790 psi | 75% | 2740 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,321 psi | 63% | 2582 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,986 psi | 61% | 2595 fps | 98.9% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 35,679 psi | 56% | 2575 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 53,693 psi | 84% | 2690 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,398 psi | 74% | 2638 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 43,337 psi | 68% | 2585 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 84% | 38,000 psi | 60% | 2526 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 44,106 psi | 69% | 2575 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,888 psi | 67% | 2552 fps | 99% |
| Shooters World Precision | <<locked>> | 80% | 51,924 psi | 81% | 2680 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,147 psi | 64% | 2536 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,907 psi | 77% | 2697 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,501 psi | 76% | 2539 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,032 psi | 66% | 2503 fps | 97.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 37,652 psi | 59% | 2520 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 47,543 psi | 75% | 2638 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 47,355 psi | 74% | 2631 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 36,651 psi | 57% | 2513 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 36,071 psi | 57% | 2457 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 45,498 psi | 71% | 2566 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,524 psi | 65% | 2556 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 88% | 38,072 psi | 60% | 2493 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 52,605 psi | 82% | 2661 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,886 psi | 64% | 2556 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 31,923 psi | 50% | 2408 fps | 98% |
| Vihtavuori N560 | 85.7 gr | 90% | 44,672 psi | 70% | 2717 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 96% | 44,034 psi | 69% | 2690 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,640 psi | 64% | 2523 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,569 psi | 67% | 2615 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,222 psi | 40% | 2313 fps | 97.3% |
| Winchester Supreme 780 | <<locked>> | 86% | 37,869 psi | 59% | 2493 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 92 powders for .338 Norma Mag. loaded with the .338 | 225gr | Barnes MRX BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,949 fps; across all powders the maximum-charge window runs from 1,742 fps to 2,949 fps. ADI AR 2217 gives the best case fill at 100 %, and 92 of the 92 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-23 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. Norma MRP, Vihtavuori N560, Alliant Reloder-26 rank at the top here: for .338 Norma Mag. with the .338 | 225gr | Barnes MRX BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, Norma 217, ReloadSwiss RS 80 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.