Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 230gr | Winchester FailSafe bullet and 66 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Accurate MAGPRO.
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.
A valid access license is required to use the Personalized Load Calculator.
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 3100 | <<locked>> | 92% | 54,259 psi | 89% | 2769 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 51,706 psi | 85% | 2746 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 52,895 psi | 87% | 2858 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 88% | 52,620 psi | 86% | 2802 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 92% | 54,027 psi | 89% | 2861 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,909 psi | 85% | 2822 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,572 psi | 76% | 2785 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 84% | 52,721 psi | 87% | 2799 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 52,301 psi | 86% | 2792 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 92% | 54,273 psi | 89% | 2858 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 92% | 52,054 psi | 85% | 2782 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 54,897 psi | 90% | 2890 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 51,967 psi | 85% | 2858 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 53,287 psi | 87% | 2841 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,665 psi | 90% | 2890 fps | 99.2% |
| Bofors RP5 | <<locked>> | 92% | 54,273 psi | 89% | 2858 fps | 99.5% |
| Bofors RP7 | <<locked>> | 82% | 53,940 psi | 89% | 2746 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 53,577 psi | 88% | 2851 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 82% | 53,301 psi | 88% | 2799 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 53,809 psi | 88% | 2799 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 52,794 psi | 87% | 2782 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 52,953 psi | 87% | 2726 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 53,824 psi | 88% | 2959 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 53,476 psi | 88% | 2828 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,173 psi | 61% | 1775 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 52,185 psi | 86% | 2736 fps | 99.7% |
| IMR 4831 | <<locked>> | 84% | 52,243 psi | 86% | 2743 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 54,781 psi | 90% | 2785 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 92% | 51,967 psi | 85% | 2838 fps | 98.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,076 psi | 69% | 2687 fps | 96.6% |
| Lovex S065 | <<locked>> | 82% | 52,649 psi | 86% | 2717 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 54,230 psi | 89% | 2766 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 52,156 psi | 86% | 2740 fps | 100% |
| Norma 204 | <<locked>> | 84% | 52,953 psi | 87% | 2785 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 42,322 psi | 69% | 2713 fps | 98.7% |
| Norma MRP | <<locked>> | 90% | 54,041 psi | 89% | 2877 fps | 99.9% |
| Norma URP | <<locked>> | 84% | 53,722 psi | 88% | 2779 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 52,576 psi | 86% | 2858 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 84% | 52,736 psi | 87% | 2789 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,056 psi | 90% | 2854 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,087 psi | 63% | 1818 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 51,706 psi | 85% | 2766 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 53,780 psi | 88% | 2848 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,520 psi | 90% | 2956 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,592 psi | 88% | 2910 fps | 98.1% |
| Rottweil R 904 | <<locked>> | 88% | 53,679 psi | 88% | 2772 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 88% | 51,808 psi | 85% | 2782 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 82% | 53,940 psi | 89% | 2746 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 82% | 52,649 psi | 86% | 2717 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 54,230 psi | 89% | 2766 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,013 psi | 90% | 2723 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 54,839 psi | 90% | 2831 fps | 99.6% |
| Somchem S361 | <<locked>> | 88% | 55,042 psi | 90% | 2762 fps | 98.3% |
| Somchem S365 | <<locked>> | 86% | 54,360 psi | 89% | 2785 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 52,214 psi | 86% | 2753 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 82% | 51,938 psi | 85% | 2723 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 51,793 psi | 85% | 2736 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 84% | 54,621 psi | 90% | 2779 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 54,172 psi | 89% | 2808 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 53,824 psi | 88% | 2871 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 96% | 53,925 psi | 89% | 2858 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,476 psi | 89% | 2910 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,882 psi | 90% | 2733 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 53,461 psi | 88% | 2799 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 53,606 psi | 88% | 2910 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 51,924 psi | 85% | 2749 fps | 99.2% |
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% | 36,260 psi | 60% | 2448 fps | 98.1% |
| Accurate 4350 | <<locked>> | 80% | 48,385 psi | 79% | 2690 fps | 100% |
| Accurate MAGPRO | 91.3 gr | 84% | 42,801 psi | 70% | 2671 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 40,176 psi | 66% | 2569 fps | 96.8% |
| ADI AR 2213 | <<locked>> | 84% | 41,133 psi | 68% | 2618 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 92% | 39,711 psi | 65% | 2585 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 88% | 31,386 psi | 52% | 2425 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,151 psi | 76% | 2694 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,292 psi | 66% | 2569 fps | 96.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,158 psi | 59% | 2510 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,824 psi | 57% | 2474 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,197 psi | 50% | 2385 fps | 96.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,392 psi | 63% | 2615 fps | 99.6% |
| Bofors RP15 | <<locked>> | 82% | 35,955 psi | 59% | 2503 fps | 95.3% |
| Bofors RP30 | <<locked>> | 90% | 38,870 psi | 64% | 2598 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 36,158 psi | 59% | 2510 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 50,647 psi | 83% | 2694 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 37,927 psi | 62% | 2546 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 49,835 psi | 82% | 2740 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 82% | 41,031 psi | 67% | 2566 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 84% | 43,134 psi | 71% | 2612 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,627 psi | 72% | 2582 fps | 100% |
| Hodgdon Retumbo | 88.4 gr | 86% | 36,013 psi | 59% | 2585 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 49,792 psi | 82% | 2769 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,978 psi | 46% | 1588 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,948 psi | 75% | 2628 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 45,803 psi | 75% | 2635 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 42,641 psi | 70% | 2569 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 84% | 39,552 psi | 65% | 2595 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 98% | 39,349 psi | 65% | 2631 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 49,530 psi | 81% | 2667 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 47,906 psi | 79% | 2661 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 31,198 psi | 51% | 2329 fps | 96.4% |
| Norma 204 | <<locked>> | 80% | 46,151 psi | 76% | 2667 fps | 98.1% |
| Norma 217 | <<locked>> | 92% | 32,256 psi | 53% | 2474 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 37,855 psi | 62% | 2575 fps | 97.6% |
| Norma URP | <<locked>> | 80% | 47,268 psi | 78% | 2677 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 39,262 psi | 64% | 2602 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 46,006 psi | 76% | 2674 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 32,735 psi | 54% | 2425 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,587 psi | 47% | 1624 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,327 psi | 79% | 2713 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,470 psi | 76% | 2730 fps | 100% |
| ReloadSwiss RS 76 | 92.4 gr | 84% | 32,822 psi | 54% | 2497 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 42,540 psi | 70% | 2707 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 41,495 psi | 68% | 2552 fps | 96% |
| Rottweil R 905 | <<locked>> | 80% | 39,711 psi | 65% | 2552 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 80% | 50,647 psi | 83% | 2694 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,530 psi | 81% | 2667 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 47,906 psi | 79% | 2661 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,530 psi | 80% | 2618 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,378 psi | 65% | 2549 fps | 96.7% |
| Somchem S361 | <<locked>> | 80% | 42,206 psi | 69% | 2539 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 44,367 psi | 73% | 2635 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,248 psi | 66% | 2536 fps | 97.8% |
| Vihtavuori N160 | <<locked>> | 80% | 48,704 psi | 80% | 2671 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,896 psi | 57% | 2415 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 48,066 psi | 79% | 2674 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,102 psi | 64% | 2549 fps | 99.8% |
| Vihtavuori N560 | <<locked>> | 82% | 40,799 psi | 67% | 2628 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 88% | 41,089 psi | 67% | 2618 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 94% | 43,976 psi | 72% | 2723 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,805 psi | 78% | 2628 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,995 psi | 82% | 2743 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 30,966 psi | 51% | 2493 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,695 psi | 60% | 2461 fps | 95.7% |
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 | 230gr | Winchester FailSafe. Hodgdon Retumbo delivers the highest muzzle velocity at 2,959 fps; across all powders the maximum-charge window runs from 1,775 fps to 2,959 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. ADI AR 2217, ADI AR 2218, ADI AR 2225 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, ReloadSwiss RS 76, Accurate MAGPRO rank at the top here: for .338 Lapua Mag. with the .338 | 230gr | Winchester FailSafe they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-33, IMR 7977 Enduron 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.