Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 250gr | Prvi Partizan HPBT bullet and 70 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Hodgdon Retumbo 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>> | 92% | 52,330 psi | 86% | 2625 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 53,722 psi | 88% | 2654 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 54,447 psi | 89% | 2766 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 90% | 54,375 psi | 89% | 2710 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 92% | 52,199 psi | 86% | 2713 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,082 psi | 82% | 2677 fps | 98.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,657 psi | 73% | 2644 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,505 psi | 89% | 2703 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,056 psi | 89% | 2700 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 52,330 psi | 86% | 2710 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 53,534 psi | 88% | 2684 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 52,692 psi | 87% | 2743 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 53,476 psi | 88% | 2766 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,853 psi | 88% | 2677 fps | 96.5% |
| Bofors RP15 | <<locked>> | 96% | 54,940 psi | 90% | 2749 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,417 psi | 86% | 2746 fps | 99.2% |
| Bofors RP5 | <<locked>> | 92% | 52,330 psi | 86% | 2710 fps | 99.5% |
| Bofors RP7 | <<locked>> | 82% | 52,576 psi | 86% | 2605 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 51,445 psi | 84% | 2700 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 82% | 51,735 psi | 85% | 2651 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 54,244 psi | 89% | 2661 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 90% | 52,040 psi | 85% | 2654 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,694 psi | 90% | 2697 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,824 psi | 90% | 2635 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 51,663 psi | 85% | 2808 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 51,677 psi | 85% | 2684 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,188 psi | 61% | 1670 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,070 psi | 89% | 2641 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 53,925 psi | 89% | 2625 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 54,027 psi | 89% | 2648 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 53,287 psi | 87% | 2641 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 94% | 53,737 psi | 88% | 2749 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 40,277 psi | 66% | 2552 fps | 96.6% |
| Lovex S065 | <<locked>> | 84% | 54,665 psi | 90% | 2625 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 52,823 psi | 87% | 2621 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 53,679 psi | 88% | 2644 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,795 psi | 90% | 2694 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 40,364 psi | 66% | 2575 fps | 98.7% |
| Norma MRP | <<locked>> | 90% | 51,938 psi | 85% | 2730 fps | 100% |
| Norma URP | <<locked>> | 84% | 52,185 psi | 86% | 2638 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 54,244 psi | 89% | 2766 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 54,418 psi | 89% | 2694 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 52,489 psi | 86% | 2703 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,029 psi | 62% | 1709 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 53,621 psi | 88% | 2677 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 51,851 psi | 85% | 2700 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 52,112 psi | 86% | 2805 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,865 psi | 84% | 2759 fps | 98% |
| Rottweil R 904 | <<locked>> | 88% | 52,083 psi | 86% | 2628 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 90% | 53,432 psi | 88% | 2690 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 82% | 52,576 psi | 86% | 2605 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,665 psi | 90% | 2625 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 52,823 psi | 87% | 2621 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 53,650 psi | 88% | 2579 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 53,011 psi | 87% | 2684 fps | 99.6% |
| Somchem S361 | <<locked>> | 88% | 53,374 psi | 88% | 2621 fps | 98.3% |
| Somchem S365 | <<locked>> | 86% | 52,576 psi | 86% | 2641 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,027 psi | 89% | 2664 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 54,665 psi | 90% | 2572 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 53,925 psi | 89% | 2631 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 53,519 psi | 88% | 2648 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 84% | 53,142 psi | 87% | 2638 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 52,272 psi | 86% | 2661 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 51,837 psi | 85% | 2726 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 96% | 51,735 psi | 85% | 2710 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,895 psi | 85% | 2759 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 53,113 psi | 87% | 2589 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 51,924 psi | 85% | 2654 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,998 psi | 90% | 2812 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 53,751 psi | 88% | 2661 fps | 99.5% |
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% | 35,012 psi | 57% | 2323 fps | 98.2% |
| Accurate 4350 | <<locked>> | 80% | 46,789 psi | 77% | 2552 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 41,162 psi | 68% | 2533 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 38,972 psi | 64% | 2438 fps | 96.9% |
| ADI AR 2213 | <<locked>> | 84% | 39,798 psi | 65% | 2484 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 92% | 38,377 psi | 63% | 2451 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 88% | 30,313 psi | 50% | 2306 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,846 psi | 74% | 2559 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,015 psi | 64% | 2434 fps | 96.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,954 psi | 57% | 2385 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,605 psi | 55% | 2349 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,225 psi | 48% | 2267 fps | 96.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,767 psi | 60% | 2480 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,763 psi | 83% | 2625 fps | 95.8% |
| Bofors RP15 | <<locked>> | 82% | 34,795 psi | 57% | 2379 fps | 95.4% |
| Bofors RP30 | <<locked>> | 90% | 37,362 psi | 61% | 2467 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 34,954 psi | 57% | 2385 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 49,429 psi | 81% | 2556 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 88% | 36,709 psi | 60% | 2418 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 48,457 psi | 80% | 2598 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 50,995 psi | 84% | 2612 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 82% | 39,682 psi | 65% | 2434 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,742 psi | 69% | 2477 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,351 psi | 70% | 2448 fps | 100% |
| Hodgdon Retumbo | 78.7 gr | 84% | 32,576 psi | 53% | 2395 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 47,935 psi | 79% | 2625 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,847 psi | 46% | 1493 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,730 psi | 73% | 2493 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,778 psi | 83% | 2575 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 44,614 psi | 73% | 2503 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 38,870 psi | 64% | 2382 fps | 95% |
| IMR 7828 SSC | <<locked>> | 84% | 38,334 psi | 63% | 2464 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 98% | 37,623 psi | 62% | 2493 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 48,269 psi | 79% | 2530 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,586 psi | 76% | 2523 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 30,255 psi | 50% | 2211 fps | 96.6% |
| Norma 204 | <<locked>> | 80% | 44,889 psi | 74% | 2530 fps | 98.2% |
| Norma 217 | <<locked>> | 92% | 30,908 psi | 51% | 2352 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 36,535 psi | 60% | 2444 fps | 97.7% |
| Norma URP | <<locked>> | 80% | 45,847 psi | 75% | 2539 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 37,956 psi | 62% | 2470 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 44,744 psi | 73% | 2539 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 31,459 psi | 52% | 2300 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,514 psi | 47% | 1529 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,746 psi | 77% | 2572 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,918 psi | 74% | 2589 fps | 100% |
| ReloadSwiss RS 76 | 84.2 gr | 84% | 31,560 psi | 52% | 2369 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 40,582 psi | 67% | 2569 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 40,408 psi | 66% | 2421 fps | 96.2% |
| Rottweil R 905 | <<locked>> | 80% | 38,435 psi | 63% | 2425 fps | 97% |
| Rottweil R 907 | <<locked>> | 80% | 49,429 psi | 81% | 2556 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,269 psi | 79% | 2530 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,586 psi | 76% | 2523 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,239 psi | 78% | 2480 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,130 psi | 63% | 2418 fps | 96.8% |
| Somchem S361 | <<locked>> | 80% | 41,017 psi | 67% | 2408 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 42,888 psi | 70% | 2497 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,059 psi | 64% | 2408 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 80% | 51,198 psi | 84% | 2526 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,239 psi | 78% | 2533 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,721 psi | 55% | 2290 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 46,702 psi | 77% | 2539 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,782 psi | 62% | 2418 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 39,262 psi | 64% | 2493 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 88% | 39,436 psi | 65% | 2484 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 94% | 42,119 psi | 69% | 2585 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,296 psi | 76% | 2493 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,631 psi | 80% | 2602 fps | 99.7% |
| Winchester StaBALL HD | 77 gr | 80% | 29,907 psi | 49% | 2372 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,505 psi | 58% | 2336 fps | 95.8% |
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 | Prvi Partizan HPBT. Winchester StaBALL HD delivers the highest muzzle velocity at 2,812 fps; across all powders the maximum-charge window runs from 1,670 fps to 2,812 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 1:12.5 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. Winchester StaBALL HD, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .338 Lapua Mag. with the .338 | 250gr | Prvi Partizan HPBT 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.