Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 250gr | Lapua Lock Base 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.
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% | 52,547 psi | 86% | 2631 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 53,780 psi | 88% | 2654 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 53,925 psi | 89% | 2769 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 92% | 54,708 psi | 90% | 2772 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 90% | 54,607 psi | 90% | 2713 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 92% | 52,402 psi | 86% | 2720 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,241 psi | 82% | 2680 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,802 psi | 74% | 2644 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 54,723 psi | 90% | 2710 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,781 psi | 90% | 2710 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,070 psi | 89% | 2700 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 52,547 psi | 86% | 2717 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 53,766 psi | 88% | 2690 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 52,895 psi | 87% | 2743 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 53,911 psi | 89% | 2772 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 54,172 psi | 89% | 2680 fps | 96.6% |
| Bofors RP15 | <<locked>> | 94% | 51,605 psi | 85% | 2700 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,591 psi | 86% | 2746 fps | 99.3% |
| Bofors RP5 | <<locked>> | 92% | 52,547 psi | 86% | 2717 fps | 99.6% |
| Bofors RP7 | <<locked>> | 82% | 52,779 psi | 87% | 2608 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 51,677 psi | 85% | 2703 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 82% | 51,996 psi | 85% | 2657 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 54,476 psi | 89% | 2667 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 90% | 52,214 psi | 86% | 2657 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,897 psi | 90% | 2700 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,056 psi | 90% | 2635 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 51,837 psi | 85% | 2812 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 51,909 psi | 85% | 2687 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,188 psi | 61% | 1673 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,317 psi | 89% | 2644 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 54,157 psi | 89% | 2628 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 54,288 psi | 89% | 2651 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 53,432 psi | 88% | 2644 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 94% | 53,954 psi | 89% | 2753 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 40,437 psi | 66% | 2552 fps | 96.6% |
| Lovex S065 | <<locked>> | 84% | 54,708 psi | 90% | 2625 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 53,055 psi | 87% | 2625 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 53,708 psi | 88% | 2648 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,027 psi | 90% | 2697 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 40,538 psi | 67% | 2579 fps | 98.8% |
| Norma MRP | <<locked>> | 90% | 52,156 psi | 86% | 2733 fps | 100% |
| Norma URP | <<locked>> | 84% | 52,431 psi | 86% | 2641 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 54,462 psi | 89% | 2769 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 54,650 psi | 90% | 2697 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 52,692 psi | 87% | 2707 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,029 psi | 62% | 1713 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 53,809 psi | 88% | 2680 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 52,098 psi | 86% | 2707 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 52,286 psi | 86% | 2808 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,024 psi | 84% | 2759 fps | 98% |
| Rottweil R 904 | <<locked>> | 88% | 52,301 psi | 86% | 2631 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 90% | 53,664 psi | 88% | 2694 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 82% | 52,779 psi | 87% | 2608 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,708 psi | 90% | 2625 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 53,055 psi | 87% | 2625 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 53,882 psi | 88% | 2585 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 53,243 psi | 87% | 2687 fps | 99.6% |
| Somchem S361 | <<locked>> | 88% | 53,548 psi | 88% | 2625 fps | 98.4% |
| Somchem S365 | <<locked>> | 86% | 52,866 psi | 87% | 2644 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,244 psi | 89% | 2667 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 54,694 psi | 90% | 2572 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 53,998 psi | 89% | 2631 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 53,722 psi | 88% | 2651 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 84% | 53,171 psi | 87% | 2638 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 52,533 psi | 86% | 2667 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 52,040 psi | 85% | 2726 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 96% | 51,982 psi | 85% | 2713 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,315 psi | 86% | 2766 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 53,330 psi | 88% | 2595 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 52,170 psi | 86% | 2657 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 51,314 psi | 84% | 2762 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 53,954 psi | 89% | 2664 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% | 35,186 psi | 58% | 2326 fps | 98.2% |
| Accurate 4350 | <<locked>> | 80% | 47,036 psi | 77% | 2556 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 38,130 psi | 63% | 2480 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 84% | 41,350 psi | 68% | 2536 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 39,189 psi | 64% | 2444 fps | 97% |
| ADI AR 2213 | <<locked>> | 84% | 40,001 psi | 66% | 2487 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 92% | 38,537 psi | 63% | 2454 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 88% | 30,443 psi | 50% | 2310 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,566 psi | 65% | 2444 fps | 97.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,918 psi | 74% | 2559 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,204 psi | 64% | 2438 fps | 97% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,027 psi | 57% | 2385 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,794 psi | 55% | 2352 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,399 psi | 48% | 2270 fps | 96.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,985 psi | 61% | 2484 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,894 psi | 84% | 2628 fps | 95.8% |
| Bofors RP15 | <<locked>> | 82% | 34,867 psi | 57% | 2379 fps | 95.5% |
| Bofors RP30 | <<locked>> | 90% | 37,420 psi | 61% | 2470 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 35,027 psi | 57% | 2385 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 49,472 psi | 81% | 2556 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 88% | 36,840 psi | 60% | 2421 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 48,515 psi | 80% | 2602 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 51,068 psi | 84% | 2615 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 82% | 39,900 psi | 66% | 2438 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,916 psi | 69% | 2480 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,554 psi | 70% | 2451 fps | 100% |
| Hodgdon Retumbo | 79 gr | 84% | 32,721 psi | 54% | 2398 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 48,167 psi | 79% | 2628 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,876 psi | 46% | 1493 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,947 psi | 74% | 2497 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,836 psi | 83% | 2579 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 44,657 psi | 73% | 2503 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 39,044 psi | 64% | 2388 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 84% | 38,522 psi | 63% | 2470 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 98% | 37,782 psi | 62% | 2497 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 48,486 psi | 80% | 2533 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,818 psi | 77% | 2526 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 30,298 psi | 50% | 2211 fps | 96.6% |
| Norma 204 | <<locked>> | 80% | 44,962 psi | 74% | 2533 fps | 98.2% |
| Norma 217 | <<locked>> | 92% | 31,082 psi | 51% | 2356 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 36,738 psi | 60% | 2451 fps | 97.8% |
| Norma URP | <<locked>> | 80% | 46,093 psi | 76% | 2543 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 38,159 psi | 63% | 2474 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 44,788 psi | 74% | 2539 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 31,633 psi | 52% | 2303 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,529 psi | 47% | 1529 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,978 psi | 77% | 2575 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,107 psi | 74% | 2595 fps | 100% |
| ReloadSwiss RS 76 | 84.5 gr | 84% | 31,705 psi | 52% | 2372 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 40,785 psi | 67% | 2572 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 40,451 psi | 66% | 2421 fps | 96.2% |
| Rottweil R 905 | <<locked>> | 80% | 38,537 psi | 63% | 2425 fps | 97% |
| Rottweil R 907 | <<locked>> | 80% | 49,472 psi | 81% | 2556 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,486 psi | 80% | 2533 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,818 psi | 77% | 2526 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,471 psi | 78% | 2487 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,203 psi | 63% | 2421 fps | 96.9% |
| Somchem S361 | <<locked>> | 80% | 41,205 psi | 68% | 2415 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 43,149 psi | 71% | 2503 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,088 psi | 64% | 2408 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 80% | 51,430 psi | 84% | 2530 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,456 psi | 78% | 2536 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,924 psi | 56% | 2293 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 46,775 psi | 77% | 2539 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,884 psi | 62% | 2421 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 39,479 psi | 65% | 2497 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 88% | 39,639 psi | 65% | 2487 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 94% | 42,279 psi | 69% | 2585 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,528 psi | 76% | 2497 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,689 psi | 80% | 2605 fps | 99.8% |
| Winchester StaBALL HD | 77.2 gr | 80% | 29,965 psi | 49% | 2372 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,694 psi | 59% | 2339 fps | 95.9% |
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 72 powders for .338 Lapua Mag. loaded with the .338 | 250gr | Lapua Lock Base. Hodgdon Retumbo delivers the highest muzzle velocity at 2,812 fps; across all powders the maximum-charge window runs from 1,673 fps to 2,812 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 1:13.5 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 | Lapua Lock Base 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.