Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 250gr | Lehigh Defense Match Solid bullet and 85 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Vihtavuori N560.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 27"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 82% | 61,032 psi | 88% | 2799 fps | 100% |
| Accurate 3100 | <<locked>> | 94% | 62,366 psi | 90% | 2871 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 59,161 psi | 85% | 2841 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 62,468 psi | 90% | 3005 fps | 99.8% |
| ADI APS 450 | <<locked>> | 82% | 61,293 psi | 88% | 2198 fps | 100% |
| ADI AR 2208 | <<locked>> | 82% | 62,787 psi | 90% | 2831 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 60,365 psi | 87% | 2917 fps | 100% |
| ADI AR 2213 | <<locked>> | 94% | 62,526 psi | 90% | 2989 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 56,318 psi | 81% | 2900 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 48,791 psi | 70% | 2884 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,633 psi | 73% | 2867 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 60,466 psi | 87% | 2890 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 61,786 psi | 89% | 2900 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 59,712 psi | 86% | 2904 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 94% | 62,453 psi | 90% | 2976 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 94% | 60,031 psi | 86% | 2874 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 60,089 psi | 86% | 2949 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 61,380 psi | 88% | 2976 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,490 psi | 77% | 2936 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 62,990 psi | 90% | 2949 fps | 99.4% |
| Bofors RP15 | <<locked>> | 96% | 61,525 psi | 88% | 2963 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 59,741 psi | 86% | 2969 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 62,453 psi | 90% | 2976 fps | 100% |
| Bofors RP7 | <<locked>> | 84% | 60,669 psi | 87% | 2841 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,986 psi | 83% | 2923 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 61,801 psi | 89% | 2910 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 61,598 psi | 88% | 2890 fps | 100% |
| Hodgdon H4831 | <<locked>> | 96% | 61,119 psi | 88% | 2913 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 60,553 psi | 87% | 2907 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 60,553 psi | 87% | 2808 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 58,972 psi | 85% | 3041 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 62,236 psi | 89% | 2946 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,362 psi | 54% | 1765 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 61,641 psi | 89% | 2805 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 59,654 psi | 86% | 2805 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 62,917 psi | 90% | 2881 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 62,033 psi | 89% | 2858 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 60,930 psi | 88% | 2848 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 62,163 psi | 89% | 2897 fps | 100% |
| IMR 7828 SSC | <<locked>> | 92% | 60,756 psi | 87% | 2972 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 98% | 60,655 psi | 87% | 2841 fps | 96.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,166 psi | 66% | 2785 fps | 99.4% |
| Lovex S065 | <<locked>> | 86% | 62,888 psi | 90% | 2851 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 61,221 psi | 88% | 2858 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 59,596 psi | 86% | 2835 fps | 100% |
| Norma 204 | <<locked>> | 86% | 60,510 psi | 87% | 2897 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 46,760 psi | 67% | 2808 fps | 100% |
| Norma MRP | <<locked>> | 92% | 62,961 psi | 90% | 2995 fps | 100% |
| Norma URP | <<locked>> | 86% | 61,206 psi | 88% | 2871 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 61,235 psi | 88% | 2982 fps | 100% |
| Ramshot Hunter | <<locked>> | 86% | 60,162 psi | 86% | 2887 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 62,671 psi | 90% | 2949 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,261 psi | 55% | 1808 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 59,451 psi | 85% | 2864 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 62,555 psi | 90% | 2953 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 60,205 psi | 86% | 3035 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 59,364 psi | 85% | 3009 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 82% | 62,526 psi | 90% | 2822 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 60,901 psi | 87% | 2881 fps | 100% |
| Rottweil R 905 | <<locked>> | 90% | 59,408 psi | 85% | 2894 fps | 100% |
| Rottweil R 907 | <<locked>> | 84% | 60,669 psi | 87% | 2841 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 86% | 62,888 psi | 90% | 2851 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 61,221 psi | 88% | 2858 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 61,264 psi | 88% | 2677 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 62,178 psi | 89% | 2812 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 62,874 psi | 90% | 2940 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 61,685 psi | 89% | 2812 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 62,671 psi | 90% | 2877 fps | 100% |
| Somchem S365 | <<locked>> | 88% | 62,613 psi | 90% | 2871 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 59,596 psi | 86% | 2858 fps | 100% |
| Unknown powder | <<locked>> | 84% | 61,322 psi | 88% | 2874 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 60,176 psi | 86% | 2749 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 61,598 psi | 88% | 2838 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 61,409 psi | 88% | 2867 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 52,112 psi | 75% | 2779 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 84% | 62,149 psi | 89% | 2887 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 62,105 psi | 89% | 2900 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 58,987 psi | 85% | 2963 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 98% | 62,584 psi | 90% | 2986 fps | 100% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 59,886 psi | 86% | 3005 fps | 99.8% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 57,421 psi | 82% | 3009 fps | 98.6% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 62,743 psi | 90% | 2812 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 61,801 psi | 89% | 2910 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 59,727 psi | 86% | 2969 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 61,380 psi | 88% | 2881 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 27"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 80% | 57,130 psi | 82% | 2749 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 38,624 psi | 55% | 2510 fps | 99.8% |
| Accurate 4350 | <<locked>> | 80% | 51,576 psi | 74% | 2736 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 37,869 psi | 54% | 2579 fps | 95.4% |
| ADI APS 450 | <<locked>> | 80% | 59,263 psi | 85% | 2172 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 58,929 psi | 85% | 2782 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 42,975 psi | 62% | 2641 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 38,392 psi | 55% | 2582 fps | 97.4% |
| ADI AR 2217 | <<locked>> | 84% | 32,489 psi | 47% | 2441 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 96% | 42,105 psi | 60% | 2740 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 25,788 psi | 37% | 2290 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,647 psi | 71% | 2743 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 57,624 psi | 83% | 2851 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,004 psi | 62% | 2635 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,827 psi | 56% | 2589 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,594 psi | 54% | 2533 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,300 psi | 46% | 2467 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,974 psi | 60% | 2687 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 42,438 psi | 61% | 2736 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,105 psi | 62% | 2618 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 36,114 psi | 52% | 2526 fps | 97.8% |
| Bofors RP30 | <<locked>> | 82% | 31,923 psi | 46% | 2457 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 38,827 psi | 56% | 2589 fps | 98.6% |
| Bofors RP7 | <<locked>> | 80% | 53,330 psi | 77% | 2736 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 31,241 psi | 45% | 2408 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 57,740 psi | 83% | 2858 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 51,097 psi | 73% | 2736 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 36,071 psi | 52% | 2477 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,219 psi | 58% | 2566 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,644 psi | 67% | 2625 fps | 100% |
| Hodgdon Retumbo | 84.4 gr | 80% | 31,618 psi | 45% | 2500 fps | 97.2% |
| Hodgdon Superformance | <<locked>> | 80% | 53,592 psi | 77% | 2828 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,065 psi | 40% | 1578 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 57,957 psi | 83% | 2759 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 56,159 psi | 81% | 2756 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,747 psi | 70% | 2680 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,839 psi | 79% | 2759 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 44,295 psi | 64% | 2608 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,322 psi | 61% | 2575 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 80% | 39,537 psi | 57% | 2618 fps | 97.8% |
| IMR 7977 Enduron | <<locked>> | 96% | 56,782 psi | 82% | 2785 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 90% | 32,605 psi | 47% | 2493 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 52,272 psi | 75% | 2707 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,676 psi | 73% | 2707 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 33,127 psi | 48% | 2392 fps | 99% |
| Norma 204 | <<locked>> | 80% | 49,284 psi | 71% | 2730 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 26,542 psi | 38% | 2343 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 40,944 psi | 59% | 2654 fps | 99.7% |
| Norma URP | <<locked>> | 80% | 50,372 psi | 72% | 2723 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 41,408 psi | 59% | 2671 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 80% | 49,226 psi | 71% | 2730 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,085 psi | 52% | 2530 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,674 psi | 41% | 1617 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,793 psi | 74% | 2759 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,314 psi | 72% | 2789 fps | 100% |
| ReloadSwiss RS 76 | 90.3 gr | 80% | 30,560 psi | 44% | 2474 fps | 97.9% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 34,447 psi | 49% | 2552 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 58,566 psi | 84% | 2776 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 44,092 psi | 63% | 2615 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 80% | 42,482 psi | 61% | 2625 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 80% | 53,330 psi | 77% | 2736 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,272 psi | 75% | 2707 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,676 psi | 73% | 2707 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 57,580 psi | 83% | 2635 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,140 psi | 73% | 2664 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,148 psi | 61% | 2618 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 58,030 psi | 83% | 2769 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 44,904 psi | 65% | 2605 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 47,718 psi | 69% | 2674 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,815 psi | 62% | 2598 fps | 99.6% |
| Unknown powder | <<locked>> | 80% | 53,766 psi | 77% | 2772 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 50,038 psi | 72% | 2618 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 53,911 psi | 77% | 2740 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,172 psi | 52% | 2457 fps | 98.4% |
| Vihtavuori N170 | <<locked>> | 98% | 48,965 psi | 70% | 2726 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 54,491 psi | 78% | 2785 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,887 psi | 60% | 2605 fps | 100% |
| Vihtavuori N560 | 85.7 gr | 80% | 38,914 psi | 56% | 2608 fps | 97.1% |
| Vihtavuori N565 | <<locked>> | 80% | 33,547 psi | 48% | 2470 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 86% | 35,969 psi | 52% | 2572 fps | 95% |
| Vihtavuori N570 | <<locked>> | 92% | 42,627 psi | 61% | 2749 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,126 psi | 73% | 2667 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 57,740 psi | 83% | 2858 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 34,548 psi | 50% | 2579 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,946 psi | 62% | 2602 fps | 99.2% |
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 92 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 250gr | Lehigh Defense Match Solid. Hodgdon Retumbo delivers the highest muzzle velocity at 3,041 fps; across all powders the maximum-charge window runs from 1,765 fps to 3,041 fps. Accurate 8700 gives the best case fill at 100 %, and 92 of the 92 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (480 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2217, ADI AR 2218 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, ReloadSwiss RS 76, Vihtavuori N560 rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 250gr | Lehigh Defense Match Solid they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, Lovex D100, Ramshot LRT burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.