Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 250gr | Woodleigh RN SN bullet and 68 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 Winchester StaBALL HD.
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>> | 90% | 52,127 psi | 86% | 2631 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 53,055 psi | 87% | 2654 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 54,346 psi | 89% | 2776 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 88% | 53,940 psi | 89% | 2713 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 90% | 51,793 psi | 85% | 2720 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,374 psi | 88% | 2743 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,848 psi | 79% | 2707 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 54,056 psi | 89% | 2703 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 53,447 psi | 88% | 2703 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 52,127 psi | 86% | 2717 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 92% | 53,490 psi | 88% | 2690 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 52,910 psi | 87% | 2749 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 53,548 psi | 88% | 2769 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,243 psi | 87% | 2684 fps | 96.8% |
| Bofors RP15 | <<locked>> | 94% | 54,723 psi | 90% | 2756 fps | 99.8% |
| Bofors RP30 | <<locked>> | 98% | 52,663 psi | 86% | 2753 fps | 99.4% |
| Bofors RP5 | <<locked>> | 90% | 52,127 psi | 86% | 2717 fps | 99.6% |
| Bofors RP7 | <<locked>> | 82% | 54,911 psi | 90% | 2651 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 54,882 psi | 90% | 2766 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 54,505 psi | 89% | 2703 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 55,056 psi | 90% | 2713 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 90% | 54,114 psi | 89% | 2697 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,346 psi | 89% | 2635 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 51,779 psi | 85% | 2818 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,955 psi | 90% | 2740 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,304 psi | 61% | 1693 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 53,243 psi | 87% | 2641 fps | 99.9% |
| IMR 4831 | <<locked>> | 84% | 53,592 psi | 88% | 2651 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 52,649 psi | 86% | 2644 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 92% | 53,548 psi | 88% | 2756 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,352 psi | 71% | 2615 fps | 97.7% |
| Lovex S065 | <<locked>> | 82% | 53,824 psi | 88% | 2625 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 52,199 psi | 86% | 2625 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 53,548 psi | 88% | 2654 fps | 100% |
| Norma 204 | <<locked>> | 84% | 54,201 psi | 89% | 2694 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 43,656 psi | 72% | 2641 fps | 99.4% |
| Norma MRP | <<locked>> | 88% | 51,822 psi | 85% | 2733 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,085 psi | 90% | 2687 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 54,143 psi | 89% | 2776 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 53,954 psi | 89% | 2694 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 52,373 psi | 86% | 2707 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,276 psi | 63% | 1732 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 53,142 psi | 87% | 2677 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 51,372 psi | 84% | 2700 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 52,141 psi | 86% | 2812 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 51,126 psi | 84% | 2766 fps | 98.2% |
| Rottweil R 904 | <<locked>> | 88% | 54,882 psi | 90% | 2684 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 88% | 53,113 psi | 87% | 2694 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 82% | 54,911 psi | 90% | 2651 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 53,824 psi | 88% | 2625 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 52,199 psi | 86% | 2625 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 52,765 psi | 87% | 2579 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 52,707 psi | 87% | 2690 fps | 99.7% |
| Somchem S361 | <<locked>> | 86% | 52,721 psi | 87% | 2625 fps | 98.5% |
| Somchem S365 | <<locked>> | 84% | 52,214 psi | 86% | 2641 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 53,548 psi | 88% | 2667 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 82% | 53,142 psi | 87% | 2631 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 53,200 psi | 87% | 2651 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 82% | 52,460 psi | 86% | 2635 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 52,127 psi | 86% | 2667 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 51,561 psi | 85% | 2726 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 94% | 51,692 psi | 85% | 2713 fps | 98.8% |
| Vihtavuori N568 | <<locked>> | 98% | 52,272 psi | 86% | 2769 fps | 97.9% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 53,011 psi | 87% | 2822 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 52,504 psi | 86% | 2589 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,694 psi | 90% | 2707 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 51,547 psi | 85% | 2766 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 53,156 psi | 87% | 2661 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% | 37,347 psi | 61% | 2375 fps | 98.9% |
| Accurate 4350 | <<locked>> | 80% | 49,705 psi | 82% | 2605 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 40,988 psi | 67% | 2536 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 41,205 psi | 68% | 2493 fps | 97.8% |
| ADI AR 2213 | <<locked>> | 80% | 36,825 psi | 60% | 2428 fps | 95% |
| ADI AR 2217 | <<locked>> | 90% | 38,116 psi | 63% | 2457 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 86% | 30,255 psi | 50% | 2310 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,471 psi | 78% | 2605 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,350 psi | 68% | 2490 fps | 97.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,144 psi | 61% | 2438 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,969 psi | 59% | 2398 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,053 psi | 51% | 2323 fps | 97.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,755 psi | 65% | 2539 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 47,007 psi | 77% | 2572 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 34,635 psi | 57% | 2379 fps | 95.6% |
| Bofors RP30 | <<locked>> | 86% | 35,041 psi | 58% | 2418 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 37,144 psi | 61% | 2438 fps | 96.7% |
| Bofors RP7 | <<locked>> | 80% | 51,648 psi | 85% | 2602 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 36,434 psi | 60% | 2421 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 51,039 psi | 84% | 2651 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 80% | 39,276 psi | 64% | 2434 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 38,609 psi | 63% | 2418 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,759 psi | 73% | 2493 fps | 100% |
| Hodgdon Retumbo | 81.1 gr | 82% | 32,474 psi | 53% | 2398 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 51,024 psi | 84% | 2680 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,007 psi | 46% | 1512 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,978 psi | 77% | 2543 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 46,949 psi | 77% | 2549 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,843 psi | 67% | 2434 fps | 96% |
| IMR 7828 SSC | <<locked>> | 82% | 38,058 psi | 62% | 2467 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 94% | 35,505 psi | 58% | 2448 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 50,662 psi | 83% | 2579 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,950 psi | 80% | 2572 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 32,213 psi | 53% | 2264 fps | 97.5% |
| Norma 204 | <<locked>> | 80% | 47,268 psi | 78% | 2582 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 31,140 psi | 51% | 2359 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 39,073 psi | 64% | 2503 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 48,399 psi | 79% | 2589 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 37,666 psi | 62% | 2470 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 47,195 psi | 77% | 2589 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 31,314 psi | 51% | 2300 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,674 psi | 47% | 1549 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,545 psi | 81% | 2625 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,805 psi | 78% | 2644 fps | 100% |
| ReloadSwiss RS 76 | 86.8 gr | 82% | 31,517 psi | 52% | 2375 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 40,756 psi | 67% | 2575 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 42,424 psi | 70% | 2470 fps | 97% |
| Rottweil R 905 | <<locked>> | 80% | 40,770 psi | 67% | 2477 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 80% | 51,648 psi | 85% | 2602 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,662 psi | 83% | 2579 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,950 psi | 80% | 2572 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,429 psi | 81% | 2530 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,437 psi | 66% | 2474 fps | 97.7% |
| Somchem S361 | <<locked>> | 80% | 43,221 psi | 71% | 2464 fps | 96.5% |
| Somchem S365 | <<locked>> | 80% | 45,629 psi | 75% | 2546 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,205 psi | 68% | 2457 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 80% | 49,908 psi | 82% | 2582 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,882 psi | 59% | 2343 fps | 96.9% |
| Vihtavuori N550 | <<locked>> | 80% | 49,197 psi | 81% | 2585 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,176 psi | 66% | 2470 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 39,102 psi | 64% | 2493 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 86% | 39,552 psi | 65% | 2493 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 92% | 42,235 psi | 69% | 2592 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 98% | 49,298 psi | 81% | 2756 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,878 psi | 80% | 2539 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,213 psi | 84% | 2654 fps | 100% |
| Winchester StaBALL HD | 81.2 gr | 80% | 32,358 psi | 53% | 2431 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,797 psi | 62% | 2392 fps | 96.9% |
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 75 powders for .338 Lapua Mag. loaded with the .338 | 250gr | Woodleigh RN SN. Vihtavuori N570 delivers the highest muzzle velocity at 2,822 fps; across all powders the maximum-charge window runs from 1,693 fps to 2,822 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 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 1:6.0 twist; slower twists will usually not stabilise this weight. 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, Winchester StaBALL HD rank at the top here: for .338 Lapua Mag. with the .338 | 250gr | Woodleigh RN SN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, 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.