Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 250gr | Sierra GameKing 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 52,736 psi | 87% | 2635 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 53,940 psi | 89% | 2657 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 54,114 psi | 89% | 2772 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 92% | 54,868 psi | 90% | 2772 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 90% | 54,737 psi | 90% | 2713 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 92% | 52,359 psi | 86% | 2717 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,386 psi | 83% | 2680 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,918 psi | 74% | 2648 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 54,897 psi | 90% | 2713 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,969 psi | 90% | 2710 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,244 psi | 89% | 2703 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 52,533 psi | 86% | 2717 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 53,925 psi | 89% | 2690 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 53,055 psi | 87% | 2746 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 53,882 psi | 88% | 2772 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 54,288 psi | 89% | 2687 fps | 96.6% |
| Bofors RP15 | <<locked>> | 94% | 51,779 psi | 85% | 2703 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,750 psi | 87% | 2749 fps | 99.3% |
| Bofors RP5 | <<locked>> | 92% | 52,533 psi | 86% | 2717 fps | 99.6% |
| Bofors RP7 | <<locked>> | 82% | 52,779 psi | 87% | 2608 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 51,764 psi | 85% | 2707 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 82% | 51,953 psi | 85% | 2657 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 54,621 psi | 90% | 2667 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 90% | 52,388 psi | 86% | 2661 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,853 psi | 90% | 2700 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 51,648 psi | 85% | 2592 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 51,996 psi | 85% | 2815 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 52,025 psi | 85% | 2687 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,246 psi | 61% | 1673 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,288 psi | 89% | 2648 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 54,128 psi | 89% | 2631 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 54,433 psi | 89% | 2654 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 53,592 psi | 88% | 2648 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 94% | 54,128 psi | 89% | 2756 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 40,582 psi | 67% | 2556 fps | 96.7% |
| Lovex S065 | <<locked>> | 84% | 54,868 psi | 90% | 2628 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 53,011 psi | 87% | 2625 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 53,838 psi | 88% | 2648 fps | 100% |
| Norma 204 | <<locked>> | 84% | 51,677 psi | 85% | 2648 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 40,669 psi | 67% | 2582 fps | 98.8% |
| Norma MRP | <<locked>> | 90% | 52,330 psi | 86% | 2733 fps | 100% |
| Norma URP | <<locked>> | 84% | 52,446 psi | 86% | 2641 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 54,636 psi | 90% | 2772 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 54,810 psi | 90% | 2697 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 52,852 psi | 87% | 2710 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,072 psi | 63% | 1713 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,012 psi | 89% | 2680 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 52,054 psi | 85% | 2703 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 52,417 psi | 86% | 2812 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,140 psi | 84% | 2762 fps | 98% |
| Rottweil R 904 | <<locked>> | 88% | 52,431 psi | 86% | 2635 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 90% | 53,838 psi | 88% | 2694 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 82% | 52,779 psi | 87% | 2608 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,868 psi | 90% | 2628 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 53,011 psi | 87% | 2625 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 53,998 psi | 89% | 2585 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 53,403 psi | 88% | 2690 fps | 99.6% |
| Somchem S361 | <<locked>> | 88% | 53,693 psi | 88% | 2628 fps | 98.4% |
| Somchem S365 | <<locked>> | 86% | 52,852 psi | 87% | 2644 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,230 psi | 89% | 2667 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 54,911 psi | 90% | 2575 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,157 psi | 89% | 2635 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 53,882 psi | 88% | 2651 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 84% | 53,359 psi | 88% | 2641 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 52,707 psi | 87% | 2667 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 52,214 psi | 86% | 2730 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 96% | 52,141 psi | 86% | 2713 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,446 psi | 86% | 2769 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 53,447 psi | 88% | 2595 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 52,141 psi | 86% | 2661 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 51,314 psi | 84% | 2762 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 54,114 psi | 89% | 2667 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% | 35,331 psi | 58% | 2329 fps | 98.3% |
| Accurate 4350 | <<locked>> | 80% | 47,239 psi | 78% | 2559 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 38,145 psi | 63% | 2477 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 84% | 41,510 psi | 68% | 2539 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 39,175 psi | 64% | 2444 fps | 97% |
| ADI AR 2213 | <<locked>> | 82% | 37,521 psi | 62% | 2434 fps | 95% |
| ADI AR 2217 | <<locked>> | 92% | 38,653 psi | 63% | 2457 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 88% | 30,516 psi | 50% | 2310 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,711 psi | 65% | 2448 fps | 97.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,107 psi | 74% | 2562 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,349 psi | 65% | 2441 fps | 97.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,157 psi | 58% | 2388 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,823 psi | 56% | 2352 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,385 psi | 48% | 2270 fps | 96.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,115 psi | 61% | 2487 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 47,906 psi | 79% | 2575 fps | 95% |
| Bofors RP15 | <<locked>> | 82% | 34,983 psi | 57% | 2382 fps | 95.5% |
| Bofors RP30 | <<locked>> | 90% | 37,536 psi | 62% | 2474 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 35,157 psi | 58% | 2388 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 49,647 psi | 82% | 2559 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 88% | 36,970 psi | 61% | 2425 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 48,660 psi | 80% | 2605 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 51,213 psi | 84% | 2618 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 82% | 40,030 psi | 66% | 2441 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 82% | 39,334 psi | 65% | 2428 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,598 psi | 70% | 2454 fps | 100% |
| Hodgdon Retumbo | 79.1 gr | 84% | 32,721 psi | 54% | 2402 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 48,327 psi | 79% | 2628 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,949 psi | 46% | 1496 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,933 psi | 74% | 2497 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,981 psi | 84% | 2582 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 44,831 psi | 74% | 2507 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 39,044 psi | 64% | 2388 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 84% | 38,508 psi | 63% | 2467 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 98% | 37,884 psi | 62% | 2500 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 48,486 psi | 80% | 2533 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,804 psi | 77% | 2526 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 30,472 psi | 50% | 2215 fps | 96.7% |
| Norma 204 | <<locked>> | 80% | 45,107 psi | 74% | 2536 fps | 98.3% |
| Norma 217 | <<locked>> | 92% | 31,183 psi | 51% | 2356 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 36,724 psi | 60% | 2451 fps | 97.8% |
| Norma URP | <<locked>> | 80% | 46,079 psi | 76% | 2543 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 38,130 psi | 63% | 2474 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 44,947 psi | 74% | 2543 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 31,734 psi | 52% | 2306 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,471 psi | 47% | 1529 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,992 psi | 77% | 2575 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,121 psi | 74% | 2595 fps | 100% |
| ReloadSwiss RS 76 | 84.7 gr | 84% | 31,821 psi | 52% | 2375 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 40,901 psi | 67% | 2575 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 40,611 psi | 67% | 2425 fps | 96.2% |
| Rottweil R 905 | <<locked>> | 80% | 38,667 psi | 63% | 2428 fps | 97% |
| Rottweil R 907 | <<locked>> | 80% | 49,647 psi | 82% | 2559 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,486 psi | 80% | 2533 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,804 psi | 77% | 2526 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,442 psi | 78% | 2487 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,348 psi | 63% | 2425 fps | 96.9% |
| Somchem S361 | <<locked>> | 80% | 41,191 psi | 68% | 2415 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 43,192 psi | 71% | 2503 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,247 psi | 64% | 2411 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 80% | 51,430 psi | 84% | 2530 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,630 psi | 78% | 2539 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,026 psi | 56% | 2297 fps | 96% |
| Vihtavuori N550 | <<locked>> | 80% | 46,934 psi | 77% | 2543 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,014 psi | 62% | 2425 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 39,624 psi | 65% | 2500 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 88% | 39,755 psi | 65% | 2490 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 94% | 42,409 psi | 70% | 2589 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,673 psi | 77% | 2500 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,834 psi | 80% | 2608 fps | 99.8% |
| Winchester StaBALL HD | 77.4 gr | 80% | 30,095 psi | 49% | 2375 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,824 psi | 59% | 2343 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 | Sierra GameKing. Hodgdon Retumbo delivers the highest muzzle velocity at 2,815 fps; across all powders the maximum-charge window runs from 1,673 fps to 2,815 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 1:14.0 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 GameKing 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.