Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 245gr | Lehigh Defense Match Solid bullet and 88 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N560, Accurate MAGPRO and Norma MRP.
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.
A valid access license is required to use the Personalized Load Calculator.
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% | 59,596 psi | 86% | 2802 fps | 100% |
| Accurate 3100 | <<locked>> | 94% | 60,263 psi | 87% | 2867 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 61,279 psi | 88% | 2890 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 60,191 psi | 86% | 2999 fps | 99.5% |
| ADI APS 450 | <<locked>> | 82% | 61,177 psi | 88% | 2211 fps | 100% |
| ADI AR 2208 | <<locked>> | 82% | 61,206 psi | 88% | 2835 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 62,468 psi | 90% | 2966 fps | 100% |
| ADI AR 2213 | <<locked>> | 94% | 60,408 psi | 87% | 2982 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,418 psi | 78% | 2894 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 46,920 psi | 67% | 2861 fps | 96.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,617 psi | 70% | 2858 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 62,482 psi | 90% | 2959 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 62,482 psi | 90% | 2959 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 62,932 psi | 90% | 2854 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 62,555 psi | 90% | 2943 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 59,770 psi | 86% | 2904 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 61,656 psi | 89% | 2953 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 94% | 60,379 psi | 87% | 2972 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 96% | 61,960 psi | 89% | 2920 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 61,844 psi | 89% | 2995 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 58,798 psi | 84% | 2969 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 50,937 psi | 73% | 2917 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 61,148 psi | 88% | 2943 fps | 99% |
| Bofors RP15 | <<locked>> | 96% | 59,480 psi | 85% | 2963 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,406 psi | 82% | 2963 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 60,379 psi | 87% | 2972 fps | 100% |
| Bofors RP7 | <<locked>> | 86% | 62,917 psi | 90% | 2890 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,985 psi | 80% | 2917 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 60,104 psi | 86% | 2913 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 60,002 psi | 86% | 2890 fps | 100% |
| Hodgdon H4831 | <<locked>> | 96% | 59,393 psi | 85% | 2910 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 62,758 psi | 90% | 2956 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 62,540 psi | 90% | 2858 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 60,684 psi | 87% | 3091 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 60,133 psi | 86% | 2943 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,304 psi | 54% | 1775 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 60,205 psi | 86% | 2812 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 62,047 psi | 89% | 2858 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 61,206 psi | 88% | 2884 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 60,553 psi | 87% | 2861 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 62,888 psi | 90% | 2897 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 60,394 psi | 87% | 2894 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 94% | 62,845 psi | 90% | 3025 fps | 100% |
| IMR 7977 Enduronᴾ | <<locked>> | 100% | 62,874 psi | 90% | 2890 fps | 96.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,077 psi | 63% | 2769 fps | 98.9% |
| Lovex S065 | <<locked>> | 86% | 61,337 psi | 88% | 2854 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 59,640 psi | 86% | 2861 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 61,467 psi | 88% | 2884 fps | 100% |
| Norma 204 | <<locked>> | 88% | 62,975 psi | 90% | 2949 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 44,527 psi | 64% | 2795 fps | 100% |
| Norma MRP | <<locked>> | 92% | 60,771 psi | 87% | 2995 fps | 100% |
| Norma URP | <<locked>> | 86% | 59,524 psi | 86% | 2874 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 58,711 psi | 84% | 2972 fps | 100% |
| Ramshot Hunter | <<locked>> | 88% | 62,482 psi | 90% | 2940 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 60,017 psi | 86% | 2943 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,203 psi | 55% | 1818 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 61,699 psi | 89% | 2917 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 60,336 psi | 87% | 2949 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 62,105 psi | 89% | 3087 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,623 psi | 81% | 2992 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 82% | 60,785 psi | 87% | 2825 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 59,205 psi | 85% | 2881 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 92% | 61,424 psi | 88% | 2943 fps | 100% |
| Rottweil R 907 | <<locked>> | 86% | 62,917 psi | 90% | 2890 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 86% | 61,337 psi | 88% | 2854 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 59,640 psi | 86% | 2861 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 62,729 psi | 90% | 2887 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 59,930 psi | 86% | 2684 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 60,524 psi | 87% | 2815 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 60,988 psi | 88% | 2940 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 60,205 psi | 86% | 2818 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 60,930 psi | 88% | 2874 fps | 99.8% |
| Somchem S365 | <<locked>> | 88% | 60,568 psi | 87% | 2871 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 61,801 psi | 89% | 2910 fps | 100% |
| Unknown powder | <<locked>> | 84% | 59,611 psi | 86% | 2877 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 62,366 psi | 90% | 2799 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 59,973 psi | 86% | 2841 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 59,480 psi | 85% | 2867 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 60,292 psi | 87% | 2887 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 60,104 psi | 86% | 2900 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 60,945 psi | 88% | 3012 fps | 100% |
| Vihtavuori N565 | <<locked>> | 98% | 60,307 psi | 87% | 2979 fps | 100% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,377 psi | 82% | 2992 fps | 99.5% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 54,911 psi | 79% | 2995 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 61,032 psi | 88% | 2815 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 60,104 psi | 86% | 2913 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 61,496 psi | 88% | 3018 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 59,422 psi | 85% | 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% | 55,695 psi | 80% | 2749 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 37,246 psi | 54% | 2503 fps | 99.5% |
| Accurate 4350 | <<locked>> | 80% | 49,864 psi | 72% | 2733 fps | 100% |
| Accurate MAGPRO | 90 gr | 82% | 39,131 psi | 56% | 2628 fps | 95.5% |
| ADI APS 450 | <<locked>> | 80% | 59,132 psi | 85% | 2182 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 57,537 psi | 83% | 2789 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 41,698 psi | 60% | 2638 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 37,086 psi | 53% | 2572 fps | 96.6% |
| ADI AR 2217 | <<locked>> | 86% | 33,678 psi | 48% | 2490 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 98% | 43,627 psi | 63% | 2789 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 82% | 26,600 psi | 38% | 2336 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,003 psi | 60% | 2635 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,003 psi | 60% | 2635 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 59,205 psi | 85% | 2808 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,124 psi | 69% | 2746 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 55,796 psi | 80% | 2851 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,626 psi | 60% | 2628 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,434 psi | 54% | 2579 fps | 98% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,129 psi | 52% | 2530 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,183 psi | 45% | 2461 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,176 psi | 58% | 2680 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 43,888 psi | 63% | 2789 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 41,959 psi | 60% | 2612 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 34,780 psi | 50% | 2516 fps | 97.1% |
| Bofors RP30 | <<locked>> | 84% | 32,909 psi | 47% | 2503 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 37,434 psi | 54% | 2579 fps | 98% |
| Bofors RP7 | <<locked>> | 80% | 52,011 psi | 75% | 2740 fps | 100% |
| Hodgdon H1000 | <<locked>> | 84% | 32,242 psi | 46% | 2454 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 56,115 psi | 81% | 2861 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 49,603 psi | 71% | 2733 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 80% | 34,954 psi | 50% | 2470 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 38,914 psi | 56% | 2559 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,092 psi | 65% | 2621 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 30,429 psi | 44% | 2484 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 51,822 psi | 74% | 2825 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,876 psi | 40% | 1585 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 56,550 psi | 81% | 2762 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,868 psi | 79% | 2759 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,500 psi | 68% | 2680 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,403 psi | 77% | 2759 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 42,960 psi | 62% | 2608 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,234 psi | 59% | 2575 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 80% | 38,174 psi | 55% | 2608 fps | 97.1% |
| IMR 7977 Enduron | <<locked>> | 98% | 58,798 psi | 84% | 2831 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 92% | 33,562 psi | 48% | 2539 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 50,836 psi | 73% | 2707 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,211 psi | 71% | 2707 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 31,937 psi | 46% | 2385 fps | 98.5% |
| Norma 204 | <<locked>> | 80% | 47,819 psi | 69% | 2726 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 27,325 psi | 39% | 2385 fps | 95.2% |
| Norma MRP | 86.2 gr | 80% | 39,421 psi | 57% | 2648 fps | 99.4% |
| Norma URP | <<locked>> | 80% | 48,791 psi | 70% | 2723 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,784 psi | 57% | 2657 fps | 98% |
| Ramshot Hunter | <<locked>> | 80% | 47,732 psi | 69% | 2730 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,621 psi | 50% | 2516 fps | 98.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,616 psi | 41% | 1627 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,125 psi | 72% | 2762 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,486 psi | 70% | 2785 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 29,356 psi | 42% | 2454 fps | 96.9% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 35,578 psi | 51% | 2602 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 56,855 psi | 82% | 2776 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 42,902 psi | 62% | 2612 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 80% | 41,031 psi | 59% | 2615 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 80% | 52,011 psi | 75% | 2740 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,836 psi | 73% | 2707 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,211 psi | 71% | 2707 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 58,624 psi | 84% | 2835 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 56,289 psi | 81% | 2641 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,777 psi | 72% | 2664 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,712 psi | 58% | 2612 fps | 98.8% |
| Somchem S355 | <<locked>> | 80% | 56,405 psi | 81% | 2772 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 43,540 psi | 63% | 2598 fps | 97.7% |
| Somchem S365 | <<locked>> | 80% | 46,180 psi | 66% | 2677 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,423 psi | 60% | 2592 fps | 99.3% |
| Unknown powder | <<locked>> | 80% | 52,156 psi | 75% | 2772 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 48,704 psi | 70% | 2621 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 52,330 psi | 75% | 2740 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,911 psi | 50% | 2451 fps | 97.7% |
| Vihtavuori N550 | <<locked>> | 80% | 52,910 psi | 76% | 2785 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,350 psi | 58% | 2602 fps | 100% |
| Vihtavuori N560 | 84.4 gr | 80% | 37,507 psi | 54% | 2598 fps | 96.3% |
| Vihtavuori N565 | <<locked>> | 82% | 34,592 psi | 50% | 2516 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 88% | 37,072 psi | 53% | 2621 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 94% | 44,063 psi | 63% | 2799 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,530 psi | 71% | 2667 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 56,115 psi | 81% | 2861 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,837 psi | 47% | 2572 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,437 psi | 60% | 2595 fps | 98.8% |
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 88 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 245gr | Lehigh Defense Match Solid. Hodgdon Retumbo delivers the highest muzzle velocity at 3,091 fps; across all powders the maximum-charge window runs from 1,775 fps to 3,091 fps. ADI AR 2217 gives the best case fill at 100 %, and 88 of the 88 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 245.0 gr projectile in 0.338" calls for a 1:10.0 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. Vihtavuori N560, Accurate MAGPRO, Norma MRP rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 245gr | Lehigh Defense Match Solid 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.