Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 210gr | Impala RNFP KO bullet and 81 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Vihtavuori N560 and Accurate MAGPRO.
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% | 62,033 psi | 89% | 3081 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 62,772 psi | 90% | 3110 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 59,146 psi | 85% | 3189 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 92% | 60,060 psi | 86% | 3192 fps | 99.2% |
| ADI APS 450 | <<locked>> | 82% | 61,076 psi | 88% | 2392 fps | 100% |
| ADI AR 2208 | <<locked>> | 82% | 61,525 psi | 88% | 3045 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 62,555 psi | 90% | 3169 fps | 100% |
| ADI AR 2213 | <<locked>> | 94% | 60,553 psi | 87% | 3182 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,853 psi | 79% | 3084 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,777 psi | 72% | 3058 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 62,714 psi | 90% | 3163 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 62,584 psi | 90% | 3153 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 60,350 psi | 87% | 3117 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 61,989 psi | 89% | 3156 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 94% | 61,017 psi | 88% | 3179 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 96% | 62,497 psi | 90% | 3133 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 61,989 psi | 89% | 3205 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 59,770 psi | 86% | 3186 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 52,054 psi | 75% | 3107 fps | 96.3% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 61,322 psi | 88% | 3130 fps | 98.1% |
| Bofors RP15 | <<locked>> | 96% | 59,988 psi | 86% | 3163 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 58,247 psi | 84% | 3166 fps | 99.8% |
| Bofors RP5 | <<locked>> | 94% | 61,017 psi | 88% | 3179 fps | 100% |
| Bofors RP7 | <<locked>> | 84% | 59,959 psi | 86% | 3048 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 60,292 psi | 87% | 3166 fps | 100% |
| Hodgdon H414 | <<locked>> | 84% | 59,741 psi | 86% | 3110 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 61,830 psi | 89% | 3114 fps | 100% |
| Hodgdon H4831 | <<locked>> | 92% | 60,365 psi | 87% | 3114 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 59,117 psi | 85% | 3097 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 59,364 psi | 85% | 3018 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 60,916 psi | 88% | 3297 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 60,611 psi | 87% | 3150 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,550 psi | 54% | 1926 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 61,554 psi | 88% | 3084 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 60,916 psi | 88% | 3064 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 62,482 psi | 90% | 3094 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 60,756 psi | 87% | 3091 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 96% | 62,555 psi | 90% | 3219 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,498 psi | 65% | 2969 fps | 98.1% |
| Lovex S065 | <<locked>> | 86% | 62,250 psi | 89% | 3064 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 60,597 psi | 87% | 3068 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 59,524 psi | 86% | 3048 fps | 100% |
| Norma 204 | <<locked>> | 86% | 59,263 psi | 85% | 3097 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 45,919 psi | 66% | 2999 fps | 99.7% |
| Norma MRP | <<locked>> | 92% | 61,351 psi | 88% | 3205 fps | 100% |
| Norma URP | <<locked>> | 86% | 60,162 psi | 86% | 3084 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 59,683 psi | 86% | 3182 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 88% | 62,845 psi | 90% | 3146 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 62,874 psi | 90% | 3173 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,479 psi | 55% | 1972 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 62,569 psi | 90% | 3130 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 60,524 psi | 87% | 3159 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 62,410 psi | 90% | 3294 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 57,377 psi | 82% | 3189 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 82% | 62,250 psi | 89% | 3045 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 59,683 psi | 86% | 3077 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 92% | 62,047 psi | 89% | 3150 fps | 100% |
| Rottweil R 907 | <<locked>> | 84% | 59,959 psi | 86% | 3048 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 86% | 62,250 psi | 89% | 3064 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 60,597 psi | 87% | 3068 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 60,510 psi | 87% | 2887 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 61,482 psi | 88% | 3018 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 61,583 psi | 88% | 3146 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 61,221 psi | 88% | 3035 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 61,569 psi | 88% | 3068 fps | 99.4% |
| Somchem S365 | <<locked>> | 88% | 61,351 psi | 88% | 3087 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 62,656 psi | 90% | 3117 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 62,453 psi | 90% | 2995 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 61,786 psi | 89% | 3068 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 62,192 psi | 89% | 3094 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 61,395 psi | 88% | 3114 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 86% | 61,279 psi | 88% | 3081 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 61,395 psi | 88% | 3117 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 60,756 psi | 87% | 3202 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 98% | 61,424 psi | 88% | 3186 fps | 99.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 58,175 psi | 84% | 3192 fps | 98.8% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 55,027 psi | 79% | 3182 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 61,293 psi | 88% | 3018 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 59,901 psi | 86% | 3110 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 61,598 psi | 88% | 3235 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 62,555 psi | 90% | 3114 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% | 39,958 psi | 57% | 2717 fps | 99.2% |
| Accurate 4350 | <<locked>> | 80% | 51,967 psi | 75% | 2956 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 42,409 psi | 61% | 2881 fps | 97% |
| Accurate MAGPRO | 94.2 gr | 82% | 42,975 psi | 62% | 2881 fps | 95.8% |
| ADI APS 450 | <<locked>> | 80% | 59,132 psi | 85% | 2362 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 58,001 psi | 83% | 2995 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 42,699 psi | 61% | 2825 fps | 97.9% |
| ADI AR 2213 | <<locked>> | 80% | 38,464 psi | 55% | 2759 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 88% | 37,536 psi | 54% | 2730 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 84% | 30,516 psi | 44% | 2592 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,279 psi | 62% | 2831 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,733 psi | 70% | 2946 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 56,391 psi | 81% | 3064 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,902 psi | 62% | 2825 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,030 psi | 56% | 2776 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,840 psi | 54% | 2736 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,040 psi | 47% | 2657 fps | 98.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,785 psi | 60% | 2890 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 48,573 psi | 70% | 3041 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 48,341 psi | 69% | 2900 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 36,492 psi | 52% | 2713 fps | 96.2% |
| Bofors RP30 | <<locked>> | 86% | 37,115 psi | 53% | 2759 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 39,030 psi | 56% | 2776 fps | 97.1% |
| Bofors RP7 | <<locked>> | 80% | 53,243 psi | 76% | 2943 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 84% | 35,897 psi | 52% | 2694 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 52,547 psi | 75% | 2995 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 54,636 psi | 78% | 3002 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 40,915 psi | 59% | 2762 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,205 psi | 58% | 2746 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,325 psi | 67% | 2825 fps | 100% |
| Hodgdon Retumbo | 86.9 gr | 80% | 32,300 psi | 46% | 2680 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 52,591 psi | 76% | 3028 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,239 psi | 41% | 1726 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,385 psi | 70% | 2874 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,041 psi | 78% | 2959 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 48,907 psi | 70% | 2890 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,337 psi | 61% | 2759 fps | 96.2% |
| IMR 7828 SSC | <<locked>> | 80% | 37,188 psi | 53% | 2740 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 94% | 37,840 psi | 54% | 2799 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 52,272 psi | 75% | 2917 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,705 psi | 73% | 2910 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 34,882 psi | 50% | 2598 fps | 98.2% |
| Norma 204 | <<locked>> | 80% | 48,791 psi | 70% | 2923 fps | 98.9% |
| Norma 217 | <<locked>> | 88% | 31,662 psi | 45% | 2654 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 40,930 psi | 59% | 2848 fps | 98.8% |
| Norma URP | <<locked>> | 80% | 49,995 psi | 72% | 2930 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 36,999 psi | 53% | 2749 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 48,834 psi | 70% | 2930 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,504 psi | 48% | 2635 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,008 psi | 42% | 1768 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,488 psi | 74% | 2972 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,211 psi | 71% | 2989 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 31,517 psi | 45% | 2654 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 40,263 psi | 58% | 2864 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 58,407 psi | 84% | 2992 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 43,874 psi | 63% | 2799 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 80% | 42,482 psi | 61% | 2815 fps | 98% |
| Rottweil R 907 | <<locked>> | 80% | 53,243 psi | 76% | 2943 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,272 psi | 75% | 2917 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,705 psi | 73% | 2910 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 57,101 psi | 82% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,111 psi | 73% | 2861 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,134 psi | 61% | 2808 fps | 98% |
| Somchem S355 | <<locked>> | 80% | 57,740 psi | 83% | 2986 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 44,889 psi | 64% | 2789 fps | 96.7% |
| Somchem S365 | <<locked>> | 80% | 47,529 psi | 68% | 2887 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,265 psi | 62% | 2795 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 80% | 55,259 psi | 79% | 2900 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 51,416 psi | 74% | 2920 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,710 psi | 54% | 2667 fps | 97.2% |
| Vihtavuori N170 | <<locked>> | 98% | 57,421 psi | 82% | 3051 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 50,807 psi | 73% | 2923 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,540 psi | 61% | 2815 fps | 100% |
| Vihtavuori N560 | 90.2 gr | 80% | 40,828 psi | 59% | 2835 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 84% | 39,262 psi | 56% | 2782 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 92% | 44,295 psi | 64% | 2940 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 98% | 51,343 psi | 74% | 3117 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,343 psi | 72% | 2867 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,707 psi | 76% | 2999 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 34,403 psi | 49% | 2785 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,508 psi | 57% | 2717 fps | 97.2% |
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 81 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 210gr | Impala RNFP KO. Hodgdon Retumbo delivers the highest muzzle velocity at 3,297 fps; across all powders the maximum-charge window runs from 1,926 fps to 3,297 fps. ADI AR 2217 gives the best case fill at 100 %, and 81 of the 81 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 210.0 gr projectile in 0.338" calls for a 1:15.0 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. Hodgdon Retumbo, Vihtavuori N560, Accurate MAGPRO rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 210gr | Impala RNFP KO 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.