Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 250gr | CutEdge LZR bullet and 86 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, ADI AR 2213 and Ramshot Grand.
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% | 59,741 psi | 86% | 2776 fps | 100% |
| Accurate 3100 | <<locked>> | 94% | 60,495 psi | 87% | 2841 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 61,511 psi | 88% | 2864 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 60,553 psi | 87% | 2972 fps | 99.6% |
| ADI APS 450 | <<locked>> | 82% | 61,163 psi | 88% | 2185 fps | 100% |
| ADI AR 2208 | <<locked>> | 82% | 61,424 psi | 88% | 2808 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 62,801 psi | 90% | 2943 fps | 100% |
| ADI AR 2213 | <<locked>> | 94% | 60,814 psi | 87% | 2959 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,549 psi | 78% | 2871 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 47,152 psi | 68% | 2841 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,921 psi | 70% | 2835 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 62,758 psi | 90% | 2913 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 60,191 psi | 86% | 2877 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 62,018 psi | 89% | 2927 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 94% | 60,800 psi | 87% | 2949 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 96% | 62,149 psi | 89% | 2894 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 62,192 psi | 89% | 2969 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 59,103 psi | 85% | 2946 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 51,285 psi | 74% | 2897 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 61,467 psi | 88% | 2920 fps | 99.2% |
| Bofors RP15 | <<locked>> | 96% | 59,683 psi | 86% | 2933 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,537 psi | 83% | 2936 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 60,800 psi | 87% | 2949 fps | 100% |
| Bofors RP7 | <<locked>> | 84% | 59,234 psi | 85% | 2815 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,115 psi | 81% | 2890 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 60,365 psi | 87% | 2887 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 60,147 psi | 86% | 2861 fps | 100% |
| Hodgdon H4831 | <<locked>> | 96% | 59,553 psi | 86% | 2887 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 58,987 psi | 85% | 2877 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 62,801 psi | 90% | 2831 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 61,046 psi | 88% | 3064 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 60,321 psi | 87% | 2917 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,289 psi | 54% | 1752 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 60,394 psi | 87% | 2782 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 62,294 psi | 89% | 2831 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 61,424 psi | 88% | 2858 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 60,829 psi | 87% | 2835 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 59,263 psi | 85% | 2822 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 60,669 psi | 87% | 2867 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 92% | 58,798 psi | 84% | 2940 fps | 100% |
| IMR 7977 Enduronᴾ | <<locked>> | 100% | 62,961 psi | 90% | 2864 fps | 96.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,338 psi | 64% | 2749 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 61,467 psi | 88% | 2825 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 59,828 psi | 86% | 2831 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 61,685 psi | 89% | 2858 fps | 100% |
| Norma 204 | <<locked>> | 86% | 58,972 psi | 85% | 2867 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 44,817 psi | 64% | 2772 fps | 100% |
| Norma MRP | <<locked>> | 92% | 61,032 psi | 88% | 2969 fps | 100% |
| Norma URP | <<locked>> | 86% | 59,698 psi | 86% | 2848 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 59,016 psi | 85% | 2949 fps | 100% |
| Ramshot Hunter | <<locked>> | 88% | 62,598 psi | 90% | 2910 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 60,452 psi | 87% | 2917 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,218 psi | 55% | 1795 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 61,801 psi | 89% | 2887 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 60,684 psi | 87% | 2927 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 62,497 psi | 90% | 3061 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,942 psi | 82% | 2969 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 82% | 60,887 psi | 87% | 2799 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 59,451 psi | 85% | 2854 fps | 100% |
| Rottweil R 905 | <<locked>> | 92% | 61,743 psi | 89% | 2917 fps | 100% |
| Rottweil R 907 | <<locked>> | 84% | 59,234 psi | 85% | 2815 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 86% | 61,467 psi | 88% | 2825 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 59,828 psi | 86% | 2831 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 62,874 psi | 90% | 2861 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 60,089 psi | 86% | 2657 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 60,698 psi | 87% | 2785 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 61,293 psi | 88% | 2917 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 60,278 psi | 87% | 2789 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 61,134 psi | 88% | 2848 fps | 99.9% |
| Somchem S365 | <<locked>> | 88% | 60,829 psi | 87% | 2844 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 61,931 psi | 89% | 2884 fps | 100% |
| Unknown powder | <<locked>> | 84% | 59,785 psi | 86% | 2848 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 62,468 psi | 90% | 2772 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 60,162 psi | 86% | 2815 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 59,669 psi | 86% | 2841 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 50,531 psi | 73% | 2746 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 84% | 60,669 psi | 87% | 2864 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 60,249 psi | 87% | 2874 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 61,192 psi | 88% | 2986 fps | 100% |
| Vihtavuori N565 | <<locked>> | 98% | 60,481 psi | 87% | 2956 fps | 100% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,638 psi | 83% | 2969 fps | 99.6% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 55,187 psi | 79% | 2969 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 61,192 psi | 88% | 2789 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 60,365 psi | 87% | 2887 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 61,888 psi | 89% | 2992 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 59,640 psi | 86% | 2854 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% | 55,999 psi | 80% | 2726 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 37,449 psi | 54% | 2484 fps | 99.6% |
| Accurate 4350 | <<locked>> | 80% | 50,125 psi | 72% | 2710 fps | 100% |
| Accurate MAGPRO | 89 gr | 82% | 39,320 psi | 56% | 2608 fps | 95.7% |
| ADI APS 450 | <<locked>> | 80% | 59,103 psi | 85% | 2156 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 57,725 psi | 83% | 2759 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 41,916 psi | 60% | 2615 fps | 99% |
| ADI AR 2213 | 82.6 gr | 80% | 37,289 psi | 54% | 2552 fps | 96.9% |
| ADI AR 2217 | <<locked>> | 86% | 33,823 psi | 49% | 2470 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 98% | 43,801 psi | 63% | 2769 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 82% | 26,687 psi | 38% | 2320 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,327 psi | 69% | 2720 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 55,985 psi | 80% | 2825 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,829 psi | 60% | 2608 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,652 psi | 54% | 2559 fps | 98.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,318 psi | 52% | 2507 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,357 psi | 45% | 2441 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,364 psi | 58% | 2657 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 44,121 psi | 63% | 2766 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 42,134 psi | 61% | 2592 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 34,969 psi | 50% | 2497 fps | 97.3% |
| Bofors RP30 | <<locked>> | 82% | 30,835 psi | 44% | 2425 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 37,652 psi | 54% | 2559 fps | 98.2% |
| Bofors RP7 | <<locked>> | 80% | 52,199 psi | 75% | 2713 fps | 100% |
| Hodgdon H1000 | <<locked>> | 84% | 32,445 psi | 47% | 2438 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 56,275 psi | 81% | 2831 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 49,792 psi | 72% | 2710 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 80% | 35,099 psi | 50% | 2448 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 39,117 psi | 56% | 2539 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,426 psi | 65% | 2598 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 30,618 psi | 44% | 2467 fps | 96.5% |
| Hodgdon Superformance | <<locked>> | 80% | 52,069 psi | 75% | 2802 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,905 psi | 40% | 1565 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 56,869 psi | 82% | 2740 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 55,187 psi | 79% | 2736 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,703 psi | 69% | 2657 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,592 psi | 77% | 2733 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 43,250 psi | 62% | 2585 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,379 psi | 59% | 2552 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 80% | 38,290 psi | 55% | 2585 fps | 97.3% |
| IMR 7977 Enduron | <<locked>> | 96% | 55,347 psi | 80% | 2753 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 90% | 31,444 psi | 45% | 2461 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 51,024 psi | 73% | 2680 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,414 psi | 71% | 2684 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 32,184 psi | 46% | 2365 fps | 98.7% |
| Norma 204 | <<locked>> | 80% | 48,066 psi | 69% | 2703 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 27,456 psi | 39% | 2369 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 39,711 psi | 57% | 2628 fps | 99.5% |
| Norma URP | <<locked>> | 80% | 49,008 psi | 70% | 2697 fps | 100% |
| Ramshot Grand | 87.9 gr | 80% | 39,958 psi | 57% | 2635 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 80% | 47,979 psi | 69% | 2707 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,809 psi | 50% | 2497 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,660 psi | 41% | 1608 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,299 psi | 72% | 2736 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,675 psi | 70% | 2759 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 29,486 psi | 42% | 2438 fps | 97.2% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 35,766 psi | 51% | 2582 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 57,087 psi | 82% | 2749 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 43,076 psi | 62% | 2589 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 80% | 41,249 psi | 59% | 2595 fps | 99% |
| Rottweil R 907 | <<locked>> | 80% | 52,199 psi | 75% | 2713 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,024 psi | 73% | 2680 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,414 psi | 71% | 2684 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 58,929 psi | 85% | 2812 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 56,565 psi | 81% | 2615 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,980 psi | 72% | 2638 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,915 psi | 59% | 2589 fps | 98.9% |
| Somchem S355 | <<locked>> | 80% | 56,594 psi | 81% | 2743 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 43,656 psi | 63% | 2579 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 46,412 psi | 67% | 2654 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,655 psi | 60% | 2572 fps | 99.5% |
| Unknown powder | <<locked>> | 80% | 52,402 psi | 75% | 2749 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 48,849 psi | 70% | 2595 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 52,576 psi | 76% | 2713 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,085 psi | 50% | 2428 fps | 97.9% |
| Vihtavuori N170 | <<locked>> | 98% | 47,369 psi | 68% | 2690 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 53,200 psi | 76% | 2762 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,553 psi | 58% | 2579 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 37,739 psi | 54% | 2579 fps | 96.6% |
| Vihtavuori N565 | <<locked>> | 82% | 34,737 psi | 50% | 2497 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 88% | 37,304 psi | 54% | 2602 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 94% | 44,179 psi | 63% | 2776 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,690 psi | 71% | 2644 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 56,275 psi | 81% | 2831 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,141 psi | 48% | 2552 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,713 psi | 60% | 2575 fps | 99% |
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 86 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 250gr | CutEdge LZR. Hodgdon Retumbo delivers the highest muzzle velocity at 3,064 fps; across all powders the maximum-charge window runs from 1,752 fps to 3,064 fps. ADI AR 2217 gives the best case fill at 100 %, and 86 of the 86 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 1:9.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2218, ADI AR 2225 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. Accurate MAGPRO, ADI AR 2213, Ramshot Grand rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 250gr | CutEdge LZR 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.