Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 250gr | Nosler Partition RN bullet and 67 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 54,244 psi | 89% | 2657 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 51,764 psi | 85% | 2631 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 52,736 psi | 87% | 2746 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 88% | 52,533 psi | 86% | 2687 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 92% | 53,795 psi | 88% | 2746 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,735 psi | 85% | 2710 fps | 99.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,383 psi | 76% | 2677 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 52,794 psi | 87% | 2684 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 52,127 psi | 86% | 2677 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 92% | 54,012 psi | 89% | 2743 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 52,011 psi | 85% | 2667 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 54,723 psi | 90% | 2772 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 51,866 psi | 85% | 2743 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,098 psi | 86% | 2654 fps | 96.3% |
| Bofors RP15 | <<locked>> | 94% | 53,243 psi | 87% | 2730 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,331 psi | 89% | 2776 fps | 99.5% |
| Bofors RP5 | <<locked>> | 92% | 54,012 psi | 89% | 2743 fps | 99.7% |
| Bofors RP7 | <<locked>> | 82% | 53,838 psi | 88% | 2631 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 53,229 psi | 87% | 2733 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 82% | 53,214 psi | 87% | 2680 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 53,780 psi | 88% | 2687 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 90% | 52,707 psi | 87% | 2671 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 52,982 psi | 87% | 2612 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 53,563 psi | 88% | 2841 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 53,374 psi | 88% | 2710 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,231 psi | 61% | 1683 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 52,272 psi | 86% | 2621 fps | 99.8% |
| IMR 4831 | <<locked>> | 84% | 52,257 psi | 86% | 2625 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 54,737 psi | 90% | 2671 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 92% | 52,011 psi | 85% | 2726 fps | 98.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 41,930 psi | 69% | 2585 fps | 97.2% |
| Lovex S065 | <<locked>> | 82% | 52,736 psi | 87% | 2602 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 54,244 psi | 89% | 2648 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 52,025 psi | 85% | 2625 fps | 100% |
| Norma 204 | <<locked>> | 84% | 52,837 psi | 87% | 2667 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 42,119 psi | 69% | 2612 fps | 99.1% |
| Norma MRP | <<locked>> | 90% | 53,867 psi | 88% | 2759 fps | 100% |
| Norma URP | <<locked>> | 84% | 53,722 psi | 88% | 2664 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 52,344 psi | 86% | 2743 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 84% | 52,562 psi | 86% | 2671 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 54,650 psi | 90% | 2736 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,218 psi | 63% | 1722 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 51,663 psi | 85% | 2651 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 53,737 psi | 88% | 2730 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,230 psi | 89% | 2841 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,214 psi | 87% | 2799 fps | 98.5% |
| Rottweil R 904 | <<locked>> | 88% | 53,548 psi | 88% | 2657 fps | 99% |
| Rottweil R 905 | <<locked>> | 88% | 51,692 psi | 85% | 2664 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 82% | 53,838 psi | 88% | 2631 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 82% | 52,736 psi | 87% | 2602 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 54,244 psi | 89% | 2648 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 51,619 psi | 85% | 2556 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 54,766 psi | 90% | 2717 fps | 99.8% |
| Somchem S361 | <<locked>> | 88% | 54,911 psi | 90% | 2651 fps | 98.7% |
| Somchem S365 | <<locked>> | 86% | 54,433 psi | 89% | 2667 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 52,257 psi | 86% | 2641 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 82% | 52,011 psi | 85% | 2608 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 51,808 psi | 85% | 2628 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 84% | 54,520 psi | 90% | 2661 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 54,186 psi | 89% | 2690 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 53,664 psi | 88% | 2759 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 96% | 53,664 psi | 88% | 2743 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,099 psi | 89% | 2795 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,708 psi | 90% | 2615 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 53,388 psi | 88% | 2680 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 53,403 psi | 88% | 2792 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 51,735 psi | 85% | 2635 fps | 99.4% |
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% | 36,318 psi | 60% | 2352 fps | 98.6% |
| Accurate 4350 | <<locked>> | 80% | 48,443 psi | 80% | 2579 fps | 100% |
| Accurate MAGPRO | 85.7 gr | 84% | 42,728 psi | 70% | 2569 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 40,161 psi | 66% | 2467 fps | 97.4% |
| ADI AR 2213 | <<locked>> | 82% | 38,348 psi | 63% | 2457 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 90% | 37,101 psi | 61% | 2428 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 86% | 29,486 psi | 48% | 2283 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,325 psi | 76% | 2585 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,335 psi | 66% | 2464 fps | 97.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,143 psi | 59% | 2415 fps | 96.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,882 psi | 57% | 2375 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,197 psi | 50% | 2297 fps | 97.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,334 psi | 63% | 2513 fps | 99.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 48,907 psi | 80% | 2602 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 33,620 psi | 55% | 2352 fps | 95.1% |
| Bofors RP30 | <<locked>> | 88% | 36,187 psi | 59% | 2444 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 36,143 psi | 59% | 2415 fps | 96.3% |
| Bofors RP7 | <<locked>> | 80% | 50,560 psi | 83% | 2579 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 35,433 psi | 58% | 2392 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 49,937 psi | 82% | 2628 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 82% | 40,944 psi | 67% | 2464 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 82% | 40,234 psi | 66% | 2451 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,729 psi | 72% | 2474 fps | 100% |
| Hodgdon Retumbo | 81 gr | 84% | 33,634 psi | 55% | 2428 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 49,661 psi | 82% | 2657 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,992 psi | 46% | 1503 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,934 psi | 75% | 2520 fps | 99.3% |
| IMR 4831 | <<locked>> | 80% | 45,948 psi | 75% | 2530 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 39,929 psi | 66% | 2411 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 82% | 36,985 psi | 61% | 2438 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 96% | 36,695 psi | 60% | 2474 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 49,530 psi | 81% | 2552 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 47,863 psi | 79% | 2546 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 31,314 psi | 51% | 2238 fps | 97.1% |
| Norma 204 | <<locked>> | 80% | 46,253 psi | 76% | 2559 fps | 98.6% |
| Norma 217 | <<locked>> | 92% | 32,198 psi | 53% | 2385 fps | 96% |
| Norma MRP | <<locked>> | 80% | 37,869 psi | 62% | 2477 fps | 98.2% |
| Norma URP | <<locked>> | 80% | 47,210 psi | 78% | 2566 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 36,579 psi | 60% | 2444 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 46,151 psi | 76% | 2569 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 82% | 32,619 psi | 54% | 2333 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,660 psi | 47% | 1539 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,225 psi | 79% | 2598 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,499 psi | 76% | 2621 fps | 100% |
| ReloadSwiss RS 76 | 84.7 gr | 82% | 30,574 psi | 50% | 2343 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 42,322 psi | 69% | 2605 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 41,582 psi | 68% | 2448 fps | 96.7% |
| Rottweil R 905 | <<locked>> | 80% | 39,682 psi | 65% | 2451 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 80% | 50,560 psi | 83% | 2579 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,530 psi | 81% | 2552 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 47,863 psi | 79% | 2546 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,414 psi | 79% | 2507 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,349 psi | 65% | 2448 fps | 97.3% |
| Somchem S361 | <<locked>> | 80% | 42,250 psi | 69% | 2438 fps | 96.1% |
| Somchem S365 | <<locked>> | 80% | 44,367 psi | 73% | 2523 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,219 psi | 66% | 2434 fps | 98.3% |
| Vihtavuori N160 | <<locked>> | 80% | 48,733 psi | 80% | 2559 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,940 psi | 57% | 2320 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 80% | 47,964 psi | 79% | 2562 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,131 psi | 64% | 2448 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 40,712 psi | 67% | 2526 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 86% | 38,348 psi | 63% | 2464 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 94% | 43,816 psi | 72% | 2618 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,747 psi | 78% | 2520 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,937 psi | 82% | 2628 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 31,067 psi | 51% | 2405 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,724 psi | 60% | 2365 fps | 96.4% |
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 73 powders for .338 Lapua Mag. loaded with the .338 | 250gr | Nosler Partition RN. Hodgdon Retumbo delivers the highest muzzle velocity at 2,841 fps; across all powders the maximum-charge window runs from 1,683 fps to 2,841 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 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 1:15.5 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, Accurate MAGPRO rank at the top here: for .338 Lapua Mag. with the .338 | 250gr | Nosler Partition RN 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.