Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 210gr | Barnes XLC BT bullet and 81 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Ramshot Grand, Hodgdon Retumbo and ReloadSwiss RS 76.
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% | 61,119 psi | 88% | 3018 fps | 100% |
| Accurate 3100 | <<locked>> | 92% | 59,219 psi | 85% | 3048 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 59,959 psi | 86% | 3074 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 62,062 psi | 89% | 3219 fps | 99% |
| ADI APS 450 | <<locked>> | 82% | 61,134 psi | 88% | 2402 fps | 100% |
| ADI AR 2208 | <<locked>> | 82% | 62,439 psi | 90% | 3061 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 59,770 psi | 86% | 3133 fps | 100% |
| ADI AR 2213 | <<locked>> | 94% | 61,598 psi | 88% | 3202 fps | 99.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,912 psi | 80% | 3107 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,778 psi | 73% | 3077 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 59,973 psi | 86% | 3123 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 61,250 psi | 88% | 3133 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 59,292 psi | 85% | 3120 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 94% | 62,105 psi | 89% | 3199 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 94% | 59,930 psi | 86% | 3100 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 59,335 psi | 85% | 3173 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 60,974 psi | 88% | 3205 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,272 psi | 77% | 3136 fps | 96.8% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 62,163 psi | 89% | 3146 fps | 98.3% |
| Bofors RP15 | <<locked>> | 96% | 61,264 psi | 88% | 3186 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 59,524 psi | 86% | 3186 fps | 99.9% |
| Bofors RP5 | <<locked>> | 94% | 62,105 psi | 89% | 3199 fps | 100% |
| Bofors RP7 | <<locked>> | 84% | 60,756 psi | 87% | 3064 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,435 psi | 83% | 3130 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 61,656 psi | 89% | 3140 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 61,279 psi | 88% | 3110 fps | 100% |
| Hodgdon H4831 | <<locked>> | 96% | 60,655 psi | 87% | 3123 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 60,133 psi | 86% | 3114 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 60,437 psi | 87% | 3038 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 62,192 psi | 89% | 3317 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 61,714 psi | 89% | 3169 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,579 psi | 54% | 1932 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 61,496 psi | 88% | 3035 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 59,553 psi | 86% | 3028 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 62,468 psi | 90% | 3100 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 61,670 psi | 89% | 3081 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 61,105 psi | 88% | 3077 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 61,743 psi | 89% | 3110 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 92% | 59,988 psi | 86% | 3186 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,601 psi | 67% | 2992 fps | 98.4% |
| Lovex S065 | <<locked>> | 84% | 59,553 psi | 86% | 3031 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 61,612 psi | 89% | 3084 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 60,626 psi | 87% | 3068 fps | 100% |
| Norma 204 | <<locked>> | 86% | 60,191 psi | 86% | 3114 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 47,079 psi | 68% | 3022 fps | 99.8% |
| Norma MRP | <<locked>> | 92% | 62,468 psi | 90% | 3222 fps | 100% |
| Norma URP | <<locked>> | 86% | 61,206 psi | 88% | 3100 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 60,075 psi | 86% | 3192 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 86% | 60,002 psi | 86% | 3114 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 61,902 psi | 89% | 3163 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,653 psi | 56% | 1982 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 59,611 psi | 86% | 3094 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 61,772 psi | 89% | 3179 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 59,466 psi | 85% | 3255 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 58,929 psi | 85% | 3215 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 90% | 60,626 psi | 87% | 3097 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 90% | 59,292 psi | 85% | 3114 fps | 100% |
| Rottweil R 907 | <<locked>> | 84% | 60,756 psi | 87% | 3064 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 59,553 psi | 86% | 3031 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 61,612 psi | 89% | 3084 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 61,206 psi | 88% | 2900 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 62,352 psi | 90% | 3031 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 62,540 psi | 90% | 3163 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 62,163 psi | 89% | 3048 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 62,627 psi | 90% | 3091 fps | 99.5% |
| Somchem S365 | <<locked>> | 88% | 62,453 psi | 90% | 3104 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 59,930 psi | 86% | 3084 fps | 100% |
| Unknown powder | <<locked>> | 84% | 61,046 psi | 88% | 3100 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 60,481 psi | 87% | 2979 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 61,424 psi | 88% | 3064 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 61,221 psi | 88% | 3084 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 62,163 psi | 89% | 3120 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 62,453 psi | 90% | 3133 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 62,598 psi | 90% | 3235 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 98% | 62,555 psi | 90% | 3205 fps | 99.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 59,480 psi | 85% | 3215 fps | 99% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 56,913 psi | 82% | 3212 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 62,337 psi | 90% | 3035 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 61,656 psi | 89% | 3140 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 59,001 psi | 85% | 3199 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 61,148 psi | 88% | 3097 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% | 57,508 psi | 83% | 2966 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 40,611 psi | 58% | 2733 fps | 99.4% |
| Accurate 4350 | <<locked>> | 80% | 52,736 psi | 76% | 2969 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 44,425 psi | 64% | 2907 fps | 95.6% |
| ADI APS 450 | <<locked>> | 80% | 59,219 psi | 85% | 2372 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 58,711 psi | 84% | 3009 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 43,352 psi | 62% | 2844 fps | 98.2% |
| ADI AR 2213 | <<locked>> | 80% | 39,146 psi | 56% | 2782 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 88% | 38,232 psi | 55% | 2753 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 82% | 29,283 psi | 42% | 2552 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,516 psi | 71% | 2963 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 57,305 psi | 82% | 3081 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,526 psi | 63% | 2841 fps | 98.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,813 psi | 57% | 2799 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,580 psi | 55% | 2753 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,620 psi | 48% | 2677 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,786 psi | 61% | 2913 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 49,647 psi | 71% | 3068 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 49,052 psi | 70% | 2920 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 37,260 psi | 54% | 2736 fps | 96.5% |
| Bofors RP30 | <<locked>> | 84% | 35,578 psi | 51% | 2723 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 39,813 psi | 57% | 2799 fps | 97.5% |
| Bofors RP7 | <<locked>> | 80% | 53,882 psi | 77% | 2956 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 34,592 psi | 50% | 2661 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 57,798 psi | 83% | 3081 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 51,155 psi | 73% | 2949 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 82% | 39,407 psi | 57% | 2733 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,930 psi | 59% | 2766 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,224 psi | 68% | 2844 fps | 100% |
| Hodgdon Retumbo | 88.4 gr | 80% | 32,924 psi | 47% | 2703 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 53,577 psi | 77% | 3048 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,282 psi | 41% | 1732 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 58,117 psi | 83% | 2989 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 56,202 psi | 81% | 2976 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,008 psi | 70% | 2890 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,853 psi | 79% | 2976 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 45,440 psi | 65% | 2831 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,888 psi | 62% | 2776 fps | 96.5% |
| IMR 7828 SSC | <<locked>> | 80% | 40,190 psi | 58% | 2818 fps | 96.3% |
| IMR 8133 Enduron | <<locked>> | 92% | 36,303 psi | 52% | 2762 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 52,939 psi | 76% | 2930 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,503 psi | 74% | 2930 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,389 psi | 51% | 2615 fps | 98.4% |
| Norma 204 | <<locked>> | 80% | 49,588 psi | 71% | 2940 fps | 99.1% |
| Norma 217 | <<locked>> | 86% | 30,429 psi | 44% | 2618 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 41,887 psi | 60% | 2871 fps | 99.1% |
| Norma URP | <<locked>> | 80% | 50,879 psi | 73% | 2946 fps | 100% |
| Ramshot Grand | 94.6 gr | 80% | 41,930 psi | 60% | 2871 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 80% | 49,661 psi | 71% | 2949 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,275 psi | 54% | 2733 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,051 psi | 42% | 1775 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,388 psi | 75% | 2986 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,270 psi | 72% | 3009 fps | 100% |
| ReloadSwiss RS 76 | 94.6 gr | 80% | 32,126 psi | 46% | 2677 fps | 96.6% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 41,234 psi | 59% | 2890 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 44,657 psi | 64% | 2818 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 80% | 43,279 psi | 62% | 2835 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 80% | 53,882 psi | 77% | 2956 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,939 psi | 76% | 2930 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,503 psi | 74% | 2930 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 57,667 psi | 83% | 2858 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,880 psi | 75% | 2877 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,931 psi | 62% | 2828 fps | 98.2% |
| Somchem S355 | <<locked>> | 80% | 58,523 psi | 84% | 3002 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 45,658 psi | 66% | 2805 fps | 97% |
| Somchem S365 | <<locked>> | 80% | 48,356 psi | 69% | 2904 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,976 psi | 63% | 2815 fps | 99% |
| Unknown powder | <<locked>> | 80% | 53,896 psi | 77% | 2999 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 50,792 psi | 73% | 2841 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 54,099 psi | 78% | 2959 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,362 psi | 54% | 2661 fps | 97.2% |
| Vihtavuori N550 | <<locked>> | 80% | 54,926 psi | 79% | 3012 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,279 psi | 62% | 2831 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 39,711 psi | 57% | 2812 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 82% | 37,565 psi | 54% | 2743 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 90% | 42,424 psi | 61% | 2904 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 96% | 49,516 psi | 71% | 3077 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,169 psi | 74% | 2881 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 57,798 psi | 83% | 3081 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,389 psi | 51% | 2805 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,598 psi | 63% | 2805 fps | 98.3% |
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 | 210gr | Barnes XLC BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,317 fps; across all powders the maximum-charge window runs from 1,932 fps to 3,317 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 210.0 gr projectile in 0.338" calls for a 1:14.0 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. Ramshot Grand, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 210gr | Barnes XLC BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-50, IMR 7977 Enduron, Lovex D100 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.