Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 250gr | Hornady InterLock RN bullet and 70 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>> | 90% | 51,895 psi | 85% | 2628 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 52,968 psi | 87% | 2651 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 53,272 psi | 87% | 2766 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 90% | 54,143 psi | 89% | 2772 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 88% | 53,650 psi | 88% | 2707 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 90% | 51,547 psi | 85% | 2713 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,171 psi | 87% | 2736 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,674 psi | 78% | 2703 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 53,983 psi | 89% | 2707 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 84% | 53,969 psi | 89% | 2703 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 53,374 psi | 88% | 2700 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 51,880 psi | 85% | 2713 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 92% | 53,229 psi | 87% | 2684 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 52,649 psi | 86% | 2746 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 53,287 psi | 87% | 2762 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,084 psi | 87% | 2680 fps | 96.7% |
| Bofors RP15 | <<locked>> | 94% | 54,665 psi | 90% | 2753 fps | 99.8% |
| Bofors RP30 | <<locked>> | 98% | 52,417 psi | 86% | 2749 fps | 99.4% |
| Bofors RP5 | <<locked>> | 90% | 51,880 psi | 85% | 2713 fps | 99.6% |
| Bofors RP7 | <<locked>> | 82% | 54,839 psi | 90% | 2651 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 54,650 psi | 90% | 2762 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 54,433 psi | 89% | 2700 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 54,998 psi | 90% | 2710 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 90% | 53,911 psi | 89% | 2694 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,288 psi | 89% | 2635 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 51,517 psi | 85% | 2812 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,679 psi | 90% | 2736 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,289 psi | 61% | 1690 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 53,200 psi | 87% | 2641 fps | 99.9% |
| IMR 4831 | <<locked>> | 84% | 53,330 psi | 88% | 2644 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 52,446 psi | 86% | 2641 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 92% | 53,272 psi | 87% | 2749 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,178 psi | 71% | 2612 fps | 97.7% |
| Lovex S065 | <<locked>> | 82% | 53,563 psi | 88% | 2618 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 51,967 psi | 85% | 2618 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 53,316 psi | 88% | 2648 fps | 100% |
| Norma 204 | <<locked>> | 84% | 53,940 psi | 89% | 2690 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 43,410 psi | 71% | 2638 fps | 99.4% |
| Norma MRP | <<locked>> | 88% | 51,576 psi | 85% | 2730 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,013 psi | 90% | 2684 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 53,867 psi | 88% | 2769 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 53,693 psi | 88% | 2690 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 52,315 psi | 86% | 2707 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,261 psi | 63% | 1732 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 52,881 psi | 87% | 2674 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,926 psi | 90% | 2749 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 51,909 psi | 85% | 2808 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,926 psi | 90% | 2825 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 88% | 54,810 psi | 90% | 2680 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 88% | 52,881 psi | 87% | 2687 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 82% | 54,839 psi | 90% | 2651 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 53,563 psi | 88% | 2618 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 51,967 psi | 85% | 2618 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 52,678 psi | 86% | 2579 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 52,475 psi | 86% | 2684 fps | 99.6% |
| Somchem S361 | <<locked>> | 86% | 52,547 psi | 86% | 2621 fps | 98.4% |
| Somchem S365 | <<locked>> | 84% | 52,112 psi | 86% | 2641 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 53,330 psi | 88% | 2664 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 82% | 53,055 psi | 87% | 2628 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 52,968 psi | 87% | 2648 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 82% | 52,243 psi | 86% | 2631 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 52,040 psi | 85% | 2664 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,071 psi | 90% | 2785 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 94% | 51,619 psi | 85% | 2713 fps | 98.7% |
| Vihtavuori N568 | <<locked>> | 98% | 52,054 psi | 85% | 2766 fps | 97.9% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 52,794 psi | 87% | 2818 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 52,243 psi | 86% | 2585 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,607 psi | 90% | 2703 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 51,256 psi | 84% | 2759 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 52,953 psi | 87% | 2657 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% | 37,130 psi | 61% | 2372 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 49,443 psi | 81% | 2598 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 40,277 psi | 66% | 2530 fps | 96.5% |
| Accurate MAGPRO | <<locked>> | 82% | 40,901 psi | 67% | 2533 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 41,118 psi | 68% | 2490 fps | 97.7% |
| ADI AR 2213 | <<locked>> | 82% | 39,363 psi | 65% | 2484 fps | 96% |
| ADI AR 2217 | <<locked>> | 90% | 38,043 psi | 62% | 2454 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 86% | 30,211 psi | 50% | 2310 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,524 psi | 68% | 2490 fps | 97.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,369 psi | 78% | 2605 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,133 psi | 68% | 2484 fps | 97.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,086 psi | 61% | 2434 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,752 psi | 59% | 2395 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,995 psi | 51% | 2320 fps | 97.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,523 psi | 65% | 2536 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 46,963 psi | 77% | 2572 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 34,534 psi | 57% | 2375 fps | 95.6% |
| Bofors RP30 | <<locked>> | 86% | 34,824 psi | 57% | 2411 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 37,086 psi | 61% | 2434 fps | 96.7% |
| Bofors RP7 | <<locked>> | 80% | 51,561 psi | 85% | 2598 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 36,260 psi | 60% | 2418 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 50,981 psi | 84% | 2648 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 80% | 39,175 psi | 64% | 2431 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 38,522 psi | 63% | 2418 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,686 psi | 73% | 2493 fps | 100% |
| Hodgdon Retumbo | 80.8 gr | 82% | 32,300 psi | 53% | 2395 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 50,937 psi | 84% | 2677 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,963 psi | 46% | 1509 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,905 psi | 77% | 2539 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 46,876 psi | 77% | 2546 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,756 psi | 67% | 2431 fps | 96% |
| IMR 7828 SSC | <<locked>> | 82% | 37,869 psi | 62% | 2461 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 94% | 35,447 psi | 58% | 2448 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 50,401 psi | 83% | 2572 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,878 psi | 80% | 2569 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 32,097 psi | 53% | 2260 fps | 97.5% |
| Norma 204 | <<locked>> | 80% | 47,195 psi | 77% | 2582 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 31,082 psi | 51% | 2359 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 38,856 psi | 64% | 2500 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 48,283 psi | 79% | 2585 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 37,579 psi | 62% | 2470 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 47,123 psi | 77% | 2589 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 31,227 psi | 51% | 2300 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,631 psi | 47% | 1545 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,458 psi | 81% | 2621 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,543 psi | 78% | 2641 fps | 100% |
| ReloadSwiss RS 76 | 86.5 gr | 82% | 31,357 psi | 51% | 2369 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 40,553 psi | 67% | 2572 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 42,366 psi | 70% | 2470 fps | 97% |
| Rottweil R 905 | <<locked>> | 80% | 40,553 psi | 67% | 2470 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 80% | 51,561 psi | 85% | 2598 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,401 psi | 83% | 2572 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,878 psi | 80% | 2569 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,371 psi | 81% | 2526 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,219 psi | 66% | 2467 fps | 97.7% |
| Somchem S361 | <<locked>> | 80% | 43,033 psi | 71% | 2461 fps | 96.4% |
| Somchem S365 | <<locked>> | 80% | 45,527 psi | 75% | 2543 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,147 psi | 68% | 2457 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 80% | 49,647 psi | 82% | 2575 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,665 psi | 59% | 2339 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 80% | 48,950 psi | 80% | 2582 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,089 psi | 66% | 2467 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 38,899 psi | 64% | 2490 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 86% | 39,378 psi | 65% | 2487 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 92% | 42,047 psi | 69% | 2585 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 98% | 49,255 psi | 81% | 2756 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,805 psi | 80% | 2539 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,140 psi | 84% | 2651 fps | 99.9% |
| Winchester StaBALL HD | 81 gr | 80% | 32,242 psi | 53% | 2428 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,579 psi | 62% | 2385 fps | 96.8% |
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 70 powders for .338 Lapua Mag. loaded with the .338 | 250gr | Hornady InterLock RN. ReloadSwiss RS 80 delivers the highest muzzle velocity at 2,825 fps; across all powders the maximum-charge window runs from 1,690 fps to 2,825 fps. ADI AR 2217 gives the best case fill at 100 %, and 70 of the 70 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 2225, Hodgdon TrailBoss 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 | Hornady InterLock RN 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.