Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 250gr | Barnes MRX BT bullet and 72 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Winchester StaBALL HD and ReloadSwiss RS 76.
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% | 54,810 psi | 90% | 2667 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 52,489 psi | 86% | 2641 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 53,664 psi | 88% | 2759 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 90% | 53,650 psi | 88% | 2703 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 55,100 psi | 90% | 2762 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,197 psi | 81% | 2667 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,845 psi | 72% | 2631 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 53,940 psi | 89% | 2700 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 53,853 psi | 88% | 2700 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,737 psi | 90% | 2710 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 53,301 psi | 88% | 2694 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,013 psi | 90% | 2756 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 52,649 psi | 86% | 2677 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 51,967 psi | 85% | 2736 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 52,576 psi | 86% | 2756 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,345 psi | 88% | 2674 fps | 96.4% |
| Bofors RP15 | <<locked>> | 96% | 54,027 psi | 89% | 2740 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,532 psi | 85% | 2733 fps | 99.1% |
| Bofors RP5 | <<locked>> | 94% | 55,013 psi | 90% | 2756 fps | 99.8% |
| Bofors RP7 | <<locked>> | 82% | 51,677 psi | 85% | 2595 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,505 psi | 89% | 2753 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 54,462 psi | 89% | 2697 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 53,606 psi | 88% | 2657 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 55,071 psi | 90% | 2703 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 53,911 psi | 89% | 2687 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,070 psi | 89% | 2628 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,534 psi | 90% | 2858 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 54,824 psi | 90% | 2733 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,014 psi | 61% | 1670 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 53,432 psi | 88% | 2638 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 53,214 psi | 87% | 2618 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 53,156 psi | 87% | 2641 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 52,576 psi | 86% | 2638 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 94% | 52,939 psi | 87% | 2740 fps | 99% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 39,204 psi | 64% | 2533 fps | 96.2% |
| Lovex S065 | <<locked>> | 84% | 53,737 psi | 88% | 2618 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 51,996 psi | 85% | 2615 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 52,460 psi | 86% | 2635 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,273 psi | 89% | 2690 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 39,218 psi | 64% | 2556 fps | 98.4% |
| Norma MRP | <<locked>> | 92% | 54,839 psi | 90% | 2776 fps | 100% |
| Norma URP | <<locked>> | 86% | 54,795 psi | 90% | 2677 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 53,548 psi | 88% | 2759 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 53,824 psi | 88% | 2690 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 51,663 psi | 85% | 2694 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,797 psi | 62% | 1709 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 52,678 psi | 86% | 2667 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,940 psi | 90% | 2749 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 51,184 psi | 84% | 2792 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 49,850 psi | 82% | 2746 fps | 97.8% |
| Rottweil R 904 | <<locked>> | 90% | 54,897 psi | 90% | 2674 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 52,591 psi | 86% | 2680 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 82% | 51,677 psi | 85% | 2595 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 53,737 psi | 88% | 2618 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 51,996 psi | 85% | 2615 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 52,852 psi | 87% | 2575 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 52,185 psi | 86% | 2677 fps | 99.5% |
| Somchem S361 | <<locked>> | 88% | 52,736 psi | 87% | 2618 fps | 98.3% |
| Somchem S365 | <<locked>> | 86% | 51,706 psi | 85% | 2635 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 53,084 psi | 87% | 2657 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 53,722 psi | 88% | 2566 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 53,011 psi | 87% | 2625 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 52,649 psi | 86% | 2638 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 84% | 52,330 psi | 86% | 2631 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,795 psi | 90% | 2703 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,694 psi | 90% | 2776 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 98% | 54,418 psi | 89% | 2753 fps | 99% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,198 psi | 84% | 2753 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 52,359 psi | 86% | 2585 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,650 psi | 90% | 2700 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 53,925 psi | 89% | 2802 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 52,881 psi | 87% | 2651 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% | 33,881 psi | 56% | 2303 fps | 97.9% |
| Accurate 4350 | <<locked>> | 80% | 45,774 psi | 75% | 2539 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 43,265 psi | 71% | 2579 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 38,305 psi | 63% | 2428 fps | 96.7% |
| ADI AR 2213 | <<locked>> | 84% | 39,044 psi | 64% | 2474 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 92% | 37,550 psi | 62% | 2438 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 90% | 31,430 psi | 52% | 2343 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,653 psi | 63% | 2431 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,048 psi | 72% | 2549 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,082 psi | 84% | 2657 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,305 psi | 63% | 2425 fps | 96.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 33,997 psi | 56% | 2365 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,779 psi | 54% | 2333 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,398 psi | 47% | 2247 fps | 96.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,795 psi | 59% | 2461 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,053 psi | 82% | 2618 fps | 95.6% |
| Bofors RP15 | <<locked>> | 82% | 33,808 psi | 56% | 2359 fps | 95% |
| Bofors RP30 | <<locked>> | 90% | 36,361 psi | 60% | 2451 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 33,997 psi | 56% | 2365 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 48,544 psi | 80% | 2546 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 35,882 psi | 59% | 2405 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 47,703 psi | 78% | 2592 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 50,227 psi | 82% | 2605 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 84% | 41,742 psi | 69% | 2480 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,002 psi | 67% | 2467 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,423 psi | 68% | 2438 fps | 100% |
| Hodgdon Retumbo | 81.2 gr | 86% | 33,924 psi | 56% | 2438 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 47,326 psi | 78% | 2618 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,717 psi | 46% | 1493 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,106 psi | 72% | 2487 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,053 psi | 82% | 2569 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 43,598 psi | 72% | 2490 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 40,828 psi | 67% | 2428 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 84% | 37,565 psi | 62% | 2454 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 98% | 36,695 psi | 60% | 2477 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 47,500 psi | 78% | 2523 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 45,788 psi | 75% | 2516 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 29,051 psi | 48% | 2188 fps | 96% |
| Norma 204 | <<locked>> | 80% | 44,034 psi | 72% | 2520 fps | 98% |
| Norma 217 | <<locked>> | 94% | 32,024 psi | 53% | 2385 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 35,636 psi | 59% | 2431 fps | 97.4% |
| Norma URP | <<locked>> | 80% | 45,063 psi | 74% | 2530 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 37,101 psi | 61% | 2454 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 43,830 psi | 72% | 2530 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 84% | 32,880 psi | 54% | 2339 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,340 psi | 47% | 1529 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,832 psi | 75% | 2562 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,150 psi | 72% | 2582 fps | 100% |
| ReloadSwiss RS 76 | 84.8 gr | 84% | 30,603 psi | 50% | 2346 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 42,815 psi | 70% | 2618 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 39,610 psi | 65% | 2408 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 37,521 psi | 62% | 2408 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 80% | 48,544 psi | 80% | 2546 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,500 psi | 78% | 2523 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 45,788 psi | 75% | 2516 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,470 psi | 76% | 2474 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,188 psi | 61% | 2405 fps | 96.5% |
| Somchem S361 | <<locked>> | 80% | 40,234 psi | 66% | 2398 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 42,061 psi | 69% | 2487 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,029 psi | 62% | 2392 fps | 97.6% |
| Vihtavuori N150 | <<locked>> | 80% | 50,459 psi | 83% | 2520 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,514 psi | 76% | 2526 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 32,909 psi | 54% | 2277 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 45,730 psi | 75% | 2526 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 36,637 psi | 60% | 2402 fps | 99.8% |
| Vihtavuori N560 | <<locked>> | 84% | 41,350 psi | 68% | 2539 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 88% | 38,406 psi | 63% | 2467 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 96% | 44,179 psi | 73% | 2628 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,600 psi | 75% | 2490 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,703 psi | 78% | 2592 fps | 99.7% |
| Winchester StaBALL HD | 77.5 gr | 80% | 28,892 psi | 47% | 2349 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 34,708 psi | 57% | 2323 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 72 powders for .338 Lapua Mag. loaded with the .338 | 250gr | Barnes MRX BT. Hodgdon Retumbo delivers the highest muzzle velocity at 2,858 fps; across all powders the maximum-charge window runs from 1,670 fps to 2,858 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 61–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Bofors RP30 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. Hodgdon Retumbo, Winchester StaBALL HD, ReloadSwiss RS 76 rank at the top here: for .338 Lapua Mag. with the .338 | 250gr | Barnes MRX BT 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.