Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 250gr | Sierra MatchKing bullet and 71 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>> | 92% | 51,692 psi | 85% | 2615 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 52,968 psi | 87% | 2641 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 53,867 psi | 88% | 2756 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 90% | 53,708 psi | 88% | 2697 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 94% | 55,100 psi | 90% | 2756 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,385 psi | 81% | 2661 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,034 psi | 72% | 2628 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 53,954 psi | 89% | 2694 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,926 psi | 90% | 2707 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 53,417 psi | 88% | 2690 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 92% | 51,517 psi | 85% | 2697 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 94% | 52,852 psi | 87% | 2674 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 52,112 psi | 86% | 2733 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 52,794 psi | 87% | 2753 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,476 psi | 88% | 2667 fps | 96.3% |
| Bofors RP15 | <<locked>> | 96% | 54,128 psi | 89% | 2736 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,605 psi | 85% | 2730 fps | 99.1% |
| Bofors RP5 | <<locked>> | 92% | 51,517 psi | 85% | 2697 fps | 99.4% |
| Bofors RP7 | <<locked>> | 82% | 52,069 psi | 85% | 2592 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,476 psi | 89% | 2743 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 54,737 psi | 90% | 2694 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 53,722 psi | 88% | 2651 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 55,071 psi | 90% | 2697 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 92% | 53,896 psi | 88% | 2680 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,288 psi | 89% | 2621 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,520 psi | 90% | 2851 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 55,027 psi | 90% | 2730 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,202 psi | 61% | 1667 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 53,621 psi | 88% | 2635 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 53,447 psi | 88% | 2615 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 53,548 psi | 88% | 2638 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 52,707 psi | 87% | 2631 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 94% | 52,953 psi | 87% | 2733 fps | 98.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 39,653 psi | 65% | 2536 fps | 96.3% |
| Lovex S065 | <<locked>> | 84% | 54,186 psi | 89% | 2615 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 52,330 psi | 86% | 2612 fps | 99.9% |
| Lovex S071 | <<locked>> | 98% | 52,852 psi | 87% | 2631 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,375 psi | 89% | 2684 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 39,682 psi | 65% | 2559 fps | 98.5% |
| Norma MRP | <<locked>> | 92% | 54,955 psi | 90% | 2772 fps | 100% |
| Norma URP | <<locked>> | 86% | 55,056 psi | 90% | 2677 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 53,635 psi | 88% | 2756 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 53,954 psi | 89% | 2684 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 51,735 psi | 85% | 2690 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,043 psi | 62% | 1706 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 53,084 psi | 87% | 2667 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,013 psi | 90% | 2743 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 51,198 psi | 84% | 2789 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 49,966 psi | 82% | 2740 fps | 97.7% |
| Rottweil R 904 | <<locked>> | 90% | 54,984 psi | 90% | 2671 fps | 99% |
| Rottweil R 905 | <<locked>> | 90% | 52,750 psi | 87% | 2677 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 82% | 52,069 psi | 85% | 2592 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,186 psi | 89% | 2615 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 52,330 psi | 86% | 2612 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 53,229 psi | 87% | 2569 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 52,388 psi | 86% | 2671 fps | 99.5% |
| Somchem S361 | <<locked>> | 88% | 52,837 psi | 87% | 2612 fps | 98.2% |
| Somchem S365 | <<locked>> | 86% | 52,054 psi | 85% | 2631 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 53,403 psi | 88% | 2654 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 54,143 psi | 89% | 2562 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 53,243 psi | 87% | 2618 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 52,939 psi | 87% | 2635 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 84% | 52,489 psi | 86% | 2625 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 51,735 psi | 85% | 2651 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,810 psi | 90% | 2769 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 98% | 54,578 psi | 90% | 2749 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,213 psi | 84% | 2746 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 52,504 psi | 86% | 2582 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,926 psi | 90% | 2697 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,027 psi | 89% | 2802 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 53,156 psi | 87% | 2648 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% | 34,664 psi | 57% | 2313 fps | 98% |
| Accurate 4350 | <<locked>> | 80% | 46,427 psi | 76% | 2543 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 43,598 psi | 72% | 2579 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 38,667 psi | 63% | 2428 fps | 96.7% |
| ADI AR 2213 | <<locked>> | 84% | 39,421 psi | 65% | 2474 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 92% | 37,913 psi | 62% | 2438 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 88% | 30,008 psi | 49% | 2293 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,295 psi | 73% | 2546 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,256 psi | 84% | 2654 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,696 psi | 64% | 2425 fps | 96.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,519 psi | 57% | 2372 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,272 psi | 55% | 2339 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,979 psi | 48% | 2257 fps | 96.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,318 psi | 60% | 2470 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,183 psi | 82% | 2612 fps | 95.5% |
| Bofors RP15 | <<locked>> | 82% | 34,345 psi | 56% | 2365 fps | 95.2% |
| Bofors RP30 | <<locked>> | 90% | 36,811 psi | 60% | 2454 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 34,519 psi | 57% | 2372 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 48,936 psi | 80% | 2543 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 36,230 psi | 59% | 2402 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 47,950 psi | 79% | 2589 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 50,502 psi | 83% | 2602 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 84% | 42,076 psi | 69% | 2477 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,292 psi | 68% | 2464 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,945 psi | 69% | 2438 fps | 100% |
| Hodgdon Retumbo | 79.7 gr | 86% | 34,287 psi | 56% | 2438 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 47,514 psi | 78% | 2615 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,905 psi | 46% | 1490 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,440 psi | 73% | 2484 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,270 psi | 83% | 2566 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 44,106 psi | 72% | 2490 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 41,046 psi | 67% | 2425 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 84% | 37,913 psi | 62% | 2451 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 98% | 37,144 psi | 61% | 2480 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 47,950 psi | 79% | 2520 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,253 psi | 76% | 2513 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 29,907 psi | 49% | 2201 fps | 96.4% |
| Norma 204 | <<locked>> | 80% | 44,440 psi | 73% | 2520 fps | 98.1% |
| Norma 217 | <<locked>> | 94% | 32,518 psi | 53% | 2392 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 36,071 psi | 59% | 2434 fps | 97.5% |
| Norma URP | <<locked>> | 80% | 45,469 psi | 75% | 2530 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 37,405 psi | 61% | 2454 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 44,280 psi | 73% | 2530 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 84% | 33,344 psi | 55% | 2346 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,427 psi | 47% | 1522 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,224 psi | 76% | 2562 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,411 psi | 73% | 2579 fps | 100% |
| ReloadSwiss RS 76 | 83.3 gr | 84% | 31,125 psi | 51% | 2352 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 43,047 psi | 71% | 2615 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 39,972 psi | 66% | 2408 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 37,971 psi | 62% | 2411 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 80% | 48,936 psi | 80% | 2543 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,950 psi | 79% | 2520 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,253 psi | 76% | 2513 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,789 psi | 77% | 2470 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,637 psi | 62% | 2405 fps | 96.6% |
| Somchem S361 | <<locked>> | 80% | 40,669 psi | 67% | 2398 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 42,496 psi | 70% | 2490 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,609 psi | 63% | 2398 fps | 97.7% |
| Vihtavuori N150 | <<locked>> | 80% | 50,850 psi | 83% | 2516 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,891 psi | 77% | 2523 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,446 psi | 55% | 2280 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 46,209 psi | 76% | 2530 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,260 psi | 61% | 2405 fps | 99.8% |
| Vihtavuori N560 | <<locked>> | 84% | 41,582 psi | 68% | 2536 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 88% | 38,899 psi | 64% | 2474 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 96% | 44,440 psi | 73% | 2628 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,876 psi | 75% | 2487 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,095 psi | 79% | 2592 fps | 99.7% |
| Winchester StaBALL HD | 76.2 gr | 80% | 29,530 psi | 48% | 2359 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,099 psi | 58% | 2323 fps | 95.6% |
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 71 powders for .338 Lapua Mag. loaded with the .338 | 250gr | Sierra MatchKing. Hodgdon Retumbo delivers the highest muzzle velocity at 2,851 fps; across all powders the maximum-charge window runs from 1,667 fps to 2,851 fps. ADI AR 2217 gives the best case fill at 100 %, and 71 of the 71 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. Hodgdon Retumbo, Winchester StaBALL HD, ReloadSwiss RS 76 rank at the top here: for .338 Lapua Mag. with the .338 | 250gr | Sierra MatchKing 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.