Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 225gr | Woodleigh PP SN bullet and 82 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% | 61,801 psi | 89% | 2956 fps | 100% |
| Accurate 3100 | <<locked>> | 92% | 59,408 psi | 85% | 2979 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 60,089 psi | 86% | 3002 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 59,117 psi | 85% | 3104 fps | 99.3% |
| ADI APS 450 | <<locked>> | 82% | 61,177 psi | 88% | 2339 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 60,945 psi | 88% | 3074 fps | 100% |
| ADI AR 2213 | <<locked>> | 92% | 59,103 psi | 85% | 3091 fps | 99.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,145 psi | 82% | 3054 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 49,806 psi | 72% | 3028 fps | 96.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,706 psi | 74% | 3018 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 61,003 psi | 88% | 3054 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 62,511 psi | 90% | 3064 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 60,278 psi | 87% | 3061 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 92% | 59,306 psi | 85% | 3081 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 94% | 60,887 psi | 87% | 3031 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 60,930 psi | 88% | 3107 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 62,323 psi | 90% | 3136 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,621 psi | 78% | 3087 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 59,843 psi | 86% | 3048 fps | 98.7% |
| Bofors RP15 | <<locked>> | 96% | 62,294 psi | 89% | 3123 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 60,800 psi | 87% | 3130 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 59,306 psi | 85% | 3081 fps | 100% |
| Bofors RP7 | <<locked>> | 84% | 61,308 psi | 88% | 2999 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 58,798 psi | 84% | 3077 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 62,598 psi | 90% | 3074 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 62,062 psi | 89% | 3048 fps | 100% |
| Hodgdon H4831 | <<locked>> | 96% | 61,844 psi | 89% | 3071 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 61,264 psi | 88% | 3061 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 61,250 psi | 88% | 2969 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 59,872 psi | 86% | 3202 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 62,801 psi | 90% | 3104 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,449 psi | 54% | 1883 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 62,076 psi | 89% | 2966 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 60,089 psi | 86% | 2963 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 59,567 psi | 86% | 2989 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 62,627 psi | 90% | 3018 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 61,583 psi | 88% | 3005 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 62,671 psi | 90% | 3051 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 92% | 61,525 psi | 88% | 3133 fps | 100% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,152 psi | 68% | 2930 fps | 99.1% |
| Lovex S065 | <<locked>> | 84% | 59,770 psi | 86% | 2963 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 61,975 psi | 89% | 3015 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 60,626 psi | 87% | 2992 fps | 100% |
| Norma 204 | <<locked>> | 86% | 61,192 psi | 88% | 3054 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 47,747 psi | 69% | 2956 fps | 100% |
| Norma MRP | <<locked>> | 90% | 59,480 psi | 85% | 3100 fps | 100% |
| Norma URP | <<locked>> | 86% | 61,931 psi | 89% | 3031 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 61,931 psi | 89% | 3140 fps | 100% |
| Ramshot Hunter | <<locked>> | 86% | 60,930 psi | 88% | 3048 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 58,856 psi | 85% | 3048 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,450 psi | 55% | 1929 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 60,249 psi | 87% | 3025 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 58,740 psi | 84% | 3054 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 61,308 psi | 88% | 3199 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 60,611 psi | 87% | 3163 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 90% | 61,569 psi | 88% | 3038 fps | 100% |
| Rottweil R 905 | <<locked>> | 90% | 60,162 psi | 86% | 3054 fps | 100% |
| Rottweil R 907 | <<locked>> | 84% | 61,308 psi | 88% | 2999 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 59,770 psi | 86% | 2963 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 61,975 psi | 89% | 3015 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 61,685 psi | 89% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 62,946 psi | 90% | 2972 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 59,727 psi | 86% | 3048 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 62,294 psi | 89% | 2976 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 59,350 psi | 85% | 2976 fps | 99.7% |
| Somchem S365 | <<locked>> | 86% | 59,321 psi | 85% | 2982 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 60,394 psi | 87% | 3015 fps | 100% |
| Unknown powder | <<locked>> | 84% | 61,902 psi | 89% | 3035 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 60,800 psi | 87% | 2907 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 62,207 psi | 89% | 2999 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 62,149 psi | 89% | 3025 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 53,098 psi | 76% | 2923 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 84% | 62,787 psi | 90% | 3048 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 59,277 psi | 85% | 3012 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 59,683 psi | 86% | 3117 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 96% | 59,509 psi | 85% | 3091 fps | 99.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 60,829 psi | 87% | 3159 fps | 99.6% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 58,494 psi | 84% | 3166 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 59,364 psi | 85% | 2920 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 62,598 psi | 90% | 3074 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 60,843 psi | 87% | 3133 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 62,149 psi | 89% | 3038 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% | 57,798 psi | 83% | 2904 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 39,639 psi | 57% | 2654 fps | 99.6% |
| Accurate 4350 | <<locked>> | 80% | 52,475 psi | 75% | 2894 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 41,582 psi | 60% | 2785 fps | 95.7% |
| ADI APS 450 | <<locked>> | 80% | 59,292 psi | 85% | 2313 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 43,598 psi | 63% | 2782 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 39,030 psi | 56% | 2720 fps | 96.7% |
| ADI AR 2217 | <<locked>> | 86% | 35,563 psi | 51% | 2635 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 98% | 46,296 psi | 67% | 2953 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 82% | 28,384 psi | 41% | 2480 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,241 psi | 72% | 2900 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 58,262 psi | 84% | 3009 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,598 psi | 63% | 2779 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,624 psi | 57% | 2730 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,377 psi | 55% | 2677 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,069 psi | 48% | 2605 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,815 psi | 62% | 2838 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 43,598 psi | 63% | 2881 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,642 psi | 63% | 2753 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 36,811 psi | 53% | 2664 fps | 97.2% |
| Bofors RP30 | <<locked>> | 82% | 32,822 psi | 47% | 2592 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 39,624 psi | 57% | 2730 fps | 98.1% |
| Bofors RP7 | <<locked>> | 80% | 53,954 psi | 78% | 2894 fps | 100% |
| Hodgdon H1000 | <<locked>> | 84% | 34,142 psi | 49% | 2602 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 58,465 psi | 84% | 3018 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 51,619 psi | 74% | 2887 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 80% | 36,782 psi | 53% | 2615 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,886 psi | 59% | 2707 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,282 psi | 68% | 2772 fps | 100% |
| Hodgdon Retumbo | 90.3 gr | 80% | 32,314 psi | 46% | 2635 fps | 96.4% |
| Hodgdon Superformance | <<locked>> | 80% | 54,404 psi | 78% | 2986 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,152 psi | 40% | 1686 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 58,465 psi | 84% | 2920 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 56,666 psi | 81% | 2913 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,327 psi | 71% | 2828 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 55,245 psi | 79% | 2913 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 45,092 psi | 65% | 2759 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,946 psi | 62% | 2717 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 80% | 40,118 psi | 58% | 2756 fps | 97.2% |
| IMR 8133 Enduron | <<locked>> | 90% | 33,518 psi | 48% | 2631 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 52,982 psi | 76% | 2861 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,314 psi | 74% | 2858 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,142 psi | 49% | 2533 fps | 98.7% |
| Norma 204 | <<locked>> | 80% | 49,864 psi | 72% | 2881 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 29,472 psi | 42% | 2536 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 41,771 psi | 60% | 2802 fps | 99.5% |
| Norma URP | <<locked>> | 80% | 50,981 psi | 73% | 2877 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 42,076 psi | 60% | 2812 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 80% | 49,879 psi | 72% | 2881 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,883 psi | 53% | 2664 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,761 psi | 41% | 1726 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,591 psi | 76% | 2917 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,981 psi | 73% | 2943 fps | 100% |
| ReloadSwiss RS 76 | 96.6 gr | 80% | 31,357 psi | 45% | 2605 fps | 97.3% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 38,305 psi | 55% | 2759 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 44,643 psi | 64% | 2759 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 80% | 43,105 psi | 62% | 2766 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 80% | 53,954 psi | 78% | 2894 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,982 psi | 76% | 2861 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,314 psi | 74% | 2858 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 58,117 psi | 83% | 2789 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,793 psi | 74% | 2812 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,772 psi | 61% | 2762 fps | 98.8% |
| Somchem S355 | <<locked>> | 80% | 58,726 psi | 84% | 2930 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 45,614 psi | 66% | 2749 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 48,501 psi | 70% | 2831 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,642 psi | 63% | 2743 fps | 99.4% |
| Unknown powder | <<locked>> | 80% | 54,375 psi | 78% | 2930 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 50,560 psi | 73% | 2769 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 54,650 psi | 79% | 2894 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,840 psi | 53% | 2595 fps | 97.9% |
| Vihtavuori N170 | <<locked>> | 98% | 49,821 psi | 72% | 2871 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 55,303 psi | 79% | 2943 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,699 psi | 61% | 2753 fps | 100% |
| Vihtavuori N560 | 91.8 gr | 80% | 39,697 psi | 57% | 2749 fps | 96.5% |
| Vihtavuori N565 | <<locked>> | 82% | 36,956 psi | 53% | 2667 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 88% | 39,595 psi | 57% | 2776 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 94% | 46,992 psi | 68% | 2963 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,648 psi | 74% | 2815 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 58,465 psi | 84% | 3018 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,418 psi | 51% | 2726 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,642 psi | 63% | 2746 fps | 98.9% |
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 88 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 225gr | Woodleigh PP SN. Hodgdon Retumbo delivers the highest muzzle velocity at 3,202 fps; across all powders the maximum-charge window runs from 1,883 fps to 3,202 fps. Accurate 8700 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 225.0 gr projectile in 0.338" calls for a 1:6.0 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 | 225gr | Woodleigh PP SN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, Lovex D100, Shooters World 50 BMG 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.