Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 240gr | NorthFork Bonded Core bullet and 80 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 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 3100 | <<locked>> | 94% | 61,017 psi | 88% | 2897 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 62,047 psi | 89% | 2920 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 59,770 psi | 86% | 3018 fps | 99.7% |
| ADI APS 450 | <<locked>> | 82% | 61,221 psi | 88% | 2231 fps | 100% |
| ADI AR 2208 | <<locked>> | 82% | 61,612 psi | 89% | 2864 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 62,772 psi | 90% | 2995 fps | 100% |
| ADI AR 2213 | <<locked>> | 94% | 60,684 psi | 87% | 3012 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,607 psi | 78% | 2920 fps | 99.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,124 psi | 71% | 2887 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 62,888 psi | 90% | 2972 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 60,205 psi | 86% | 2933 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 62,047 psi | 89% | 2979 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 94% | 60,829 psi | 87% | 3002 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 96% | 62,395 psi | 90% | 2949 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 62,178 psi | 89% | 3025 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 59,364 psi | 85% | 3002 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 51,459 psi | 74% | 2946 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 61,322 psi | 88% | 2969 fps | 98.9% |
| Bofors RP15 | <<locked>> | 96% | 59,915 psi | 86% | 2989 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,928 psi | 83% | 2992 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 60,829 psi | 87% | 3002 fps | 100% |
| Bofors RP7 | <<locked>> | 84% | 59,509 psi | 85% | 2867 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 60,495 psi | 87% | 3002 fps | 100% |
| Hodgdon H414 | <<locked>> | 84% | 59,451 psi | 85% | 2927 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 61,873 psi | 89% | 2936 fps | 100% |
| Hodgdon H4831 | <<locked>> | 92% | 60,147 psi | 86% | 2943 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 59,001 psi | 85% | 2927 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 59,146 psi | 85% | 2841 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 60,988 psi | 88% | 3117 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 60,524 psi | 87% | 2972 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,449 psi | 54% | 1795 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 61,569 psi | 88% | 2910 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 60,916 psi | 88% | 2887 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 62,105 psi | 89% | 2907 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 60,742 psi | 87% | 2920 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 96% | 62,975 psi | 90% | 3048 fps | 100% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,686 psi | 64% | 2799 fps | 98.9% |
| Lovex S065 | <<locked>> | 86% | 61,873 psi | 89% | 2884 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 60,060 psi | 86% | 2887 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 62,018 psi | 89% | 2910 fps | 100% |
| Norma 204 | <<locked>> | 86% | 59,117 psi | 85% | 2920 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 45,150 psi | 65% | 2825 fps | 99.9% |
| Norma MRP | <<locked>> | 92% | 61,017 psi | 88% | 3022 fps | 100% |
| Norma URP | <<locked>> | 86% | 59,828 psi | 86% | 2900 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 59,857 psi | 86% | 3012 fps | 100% |
| Ramshot Hunter | <<locked>> | 88% | 62,700 psi | 90% | 2966 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 62,743 psi | 90% | 2995 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,247 psi | 55% | 1834 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 62,047 psi | 89% | 2946 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 60,727 psi | 87% | 2979 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 62,424 psi | 90% | 3114 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 57,087 psi | 82% | 3018 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 82% | 61,308 psi | 88% | 2854 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 59,567 psi | 86% | 2907 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 92% | 61,859 psi | 89% | 2972 fps | 100% |
| Rottweil R 907 | <<locked>> | 84% | 59,509 psi | 85% | 2867 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 86% | 61,873 psi | 89% | 2884 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 60,060 psi | 86% | 2887 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 62,961 psi | 90% | 2913 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 60,176 psi | 86% | 2710 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 61,032 psi | 88% | 2841 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 61,424 psi | 88% | 2969 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 60,626 psi | 87% | 2848 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 61,337 psi | 88% | 2900 fps | 99.8% |
| Somchem S365 | <<locked>> | 88% | 61,090 psi | 88% | 2900 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 62,134 psi | 89% | 2936 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 62,062 psi | 89% | 2815 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 61,685 psi | 89% | 2890 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 61,801 psi | 89% | 2917 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 60,858 psi | 87% | 2949 fps | 97.5% |
| Vihtavuori N550 | <<locked>> | 86% | 60,727 psi | 87% | 2897 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 60,597 psi | 87% | 2930 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 60,539 psi | 87% | 3025 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 98% | 60,872 psi | 87% | 3012 fps | 100% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,783 psi | 83% | 3022 fps | 99.4% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 54,781 psi | 79% | 3018 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 61,395 psi | 88% | 2841 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 59,669 psi | 86% | 2930 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 61,946 psi | 89% | 3048 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 62,410 psi | 90% | 2940 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 3100 | <<locked>> | 80% | 38,203 psi | 55% | 2539 fps | 99.6% |
| Accurate 4350 | <<locked>> | 80% | 50,720 psi | 73% | 2769 fps | 100% |
| Accurate MAGPRO | 88 gr | 80% | 39,175 psi | 56% | 2651 fps | 95.9% |
| ADI APS 450 | <<locked>> | 80% | 59,176 psi | 85% | 2205 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 57,798 psi | 83% | 2815 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 42,090 psi | 60% | 2664 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 80% | 37,652 psi | 54% | 2602 fps | 96.6% |
| ADI AR 2217 | <<locked>> | 86% | 34,200 psi | 49% | 2516 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 82% | 27,253 psi | 39% | 2369 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,443 psi | 70% | 2772 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 56,101 psi | 81% | 2881 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,177 psi | 61% | 2657 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,058 psi | 55% | 2612 fps | 98% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,840 psi | 53% | 2562 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,778 psi | 46% | 2490 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,901 psi | 59% | 2717 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 44,483 psi | 64% | 2818 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 45,020 psi | 65% | 2690 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 35,447 psi | 51% | 2549 fps | 97.1% |
| Bofors RP30 | <<locked>> | 84% | 33,547 psi | 48% | 2536 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 38,058 psi | 55% | 2612 fps | 98% |
| Bofors RP7 | <<locked>> | 80% | 52,460 psi | 75% | 2766 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 32,576 psi | 47% | 2477 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 52,054 psi | 75% | 2822 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 54,447 psi | 78% | 2831 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 40,132 psi | 58% | 2602 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 39,465 psi | 57% | 2589 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,701 psi | 66% | 2651 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 31,024 psi | 45% | 2516 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 52,301 psi | 75% | 2854 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,065 psi | 40% | 1604 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,834 psi | 69% | 2703 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,853 psi | 77% | 2789 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,921 psi | 69% | 2713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,611 psi | 60% | 2598 fps | 97.2% |
| IMR 7828 SSC | <<locked>> | 80% | 36,274 psi | 52% | 2579 fps | 96.2% |
| IMR 8133 Enduron | <<locked>> | 92% | 34,185 psi | 49% | 2572 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 51,459 psi | 74% | 2736 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,879 psi | 72% | 2736 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 32,909 psi | 47% | 2421 fps | 98.6% |
| Norma 204 | <<locked>> | 80% | 48,312 psi | 69% | 2753 fps | 99.5% |
| Norma 217 | <<locked>> | 86% | 28,079 psi | 40% | 2425 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 40,074 psi | 58% | 2680 fps | 99.4% |
| Norma URP | <<locked>> | 80% | 49,400 psi | 71% | 2753 fps | 100% |
| Ramshot Grand | 85.7 gr | 80% | 35,998 psi | 52% | 2589 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 80% | 48,269 psi | 69% | 2759 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 32,155 psi | 46% | 2470 fps | 97% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,703 psi | 41% | 1640 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,647 psi | 73% | 2789 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,936 psi | 70% | 2815 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 30,110 psi | 43% | 2490 fps | 97% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 36,318 psi | 52% | 2635 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 57,595 psi | 83% | 2808 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 43,279 psi | 62% | 2638 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 80% | 41,524 psi | 60% | 2644 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 80% | 52,460 psi | 75% | 2766 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,459 psi | 74% | 2736 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,879 psi | 72% | 2736 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 59,074 psi | 85% | 2864 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 56,739 psi | 82% | 2667 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,401 psi | 72% | 2690 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,191 psi | 59% | 2641 fps | 98.7% |
| Somchem S355 | <<locked>> | 80% | 57,058 psi | 82% | 2802 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 44,106 psi | 63% | 2628 fps | 97.6% |
| Somchem S365 | <<locked>> | 80% | 46,688 psi | 67% | 2707 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,134 psi | 61% | 2625 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 80% | 54,679 psi | 79% | 2723 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,821 psi | 73% | 2743 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,622 psi | 53% | 2503 fps | 98% |
| Vihtavuori N170 | <<locked>> | 94% | 49,632 psi | 71% | 2772 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 50,154 psi | 72% | 2749 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,220 psi | 59% | 2635 fps | 100% |
| Vihtavuori N560 | 86.4 gr | 80% | 40,045 psi | 58% | 2671 fps | 96.9% |
| Vihtavuori N565 | <<locked>> | 82% | 35,389 psi | 51% | 2552 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 88% | 37,739 psi | 54% | 2651 fps | 95% |
| Vihtavuori N570 | <<locked>> | 94% | 44,193 psi | 63% | 2825 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,995 psi | 72% | 2697 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,214 psi | 75% | 2822 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,533 psi | 48% | 2608 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,609 psi | 55% | 2556 fps | 98% |
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 80 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 240gr | NorthFork Bonded Core. Hodgdon Retumbo delivers the highest muzzle velocity at 3,117 fps; across all powders the maximum-charge window runs from 1,795 fps to 3,117 fps. ADI AR 2217 gives the best case fill at 100 %, and 80 of the 80 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 240.0 gr projectile in 0.338" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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, Ramshot Grand rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 240gr | NorthFork Bonded Core 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.