Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 210gr | Barnes X BT bullet and 83 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.
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 3100 | <<locked>> | 94% | 60,524 psi | 87% | 3058 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 61,438 psi | 88% | 3087 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 61,540 psi | 88% | 3222 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 94% | 62,598 psi | 90% | 3228 fps | 99.3% |
| ADI APS 450 | <<locked>> | 82% | 61,032 psi | 88% | 2379 fps | 100% |
| ADI AR 2208 | <<locked>> | 82% | 60,597 psi | 87% | 3025 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 61,090 psi | 88% | 3143 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 94% | 59,132 psi | 85% | 3156 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,519 psi | 77% | 3054 fps | 99.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,370 psi | 69% | 3028 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 61,482 psi | 88% | 3140 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 62,642 psi | 90% | 3051 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 61,221 psi | 88% | 3133 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 58,769 psi | 84% | 3094 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 60,727 psi | 87% | 3133 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 94% | 59,596 psi | 86% | 3156 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 96% | 60,930 psi | 88% | 3110 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 60,365 psi | 87% | 3182 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 62,279 psi | 89% | 3219 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 60,118 psi | 86% | 3104 fps | 97.7% |
| Bofors RP15 | <<locked>> | 98% | 62,352 psi | 90% | 3192 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,521 psi | 81% | 3136 fps | 99.6% |
| Bofors RP5 | <<locked>> | 94% | 59,596 psi | 86% | 3156 fps | 100% |
| Bofors RP7 | <<locked>> | 86% | 62,424 psi | 90% | 3077 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 58,900 psi | 85% | 3143 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 86% | 62,236 psi | 89% | 3136 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 60,640 psi | 87% | 3091 fps | 100% |
| Hodgdon H4831 | <<locked>> | 94% | 62,816 psi | 90% | 3143 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 61,670 psi | 89% | 3130 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 61,830 psi | 89% | 3048 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 59,117 psi | 85% | 3268 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 59,117 psi | 85% | 3123 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,478 psi | 54% | 1916 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 60,321 psi | 87% | 3061 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 59,944 psi | 86% | 3045 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 61,105 psi | 88% | 3068 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 59,466 psi | 85% | 3061 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 96% | 60,916 psi | 88% | 3192 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,135 psi | 63% | 2940 fps | 97.7% |
| Lovex S065 | <<locked>> | 86% | 61,221 psi | 88% | 3045 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 59,466 psi | 85% | 3045 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 61,670 psi | 89% | 3071 fps | 100% |
| Norma 204 | <<locked>> | 88% | 61,844 psi | 89% | 3127 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 44,498 psi | 64% | 2969 fps | 99.4% |
| Norma MRP | <<locked>> | 92% | 59,640 psi | 86% | 3176 fps | 100% |
| Norma URP | <<locked>> | 88% | 62,627 psi | 90% | 3114 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 62,221 psi | 89% | 3215 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 88% | 61,525 psi | 88% | 3123 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 61,032 psi | 88% | 3146 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,406 psi | 55% | 1962 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 62,395 psi | 90% | 3130 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 61,192 psi | 88% | 3107 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 59,117 psi | 85% | 3140 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 60,466 psi | 87% | 3264 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,564 psi | 80% | 3159 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 82% | 61,076 psi | 88% | 3025 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 62,149 psi | 89% | 3107 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 92% | 60,553 psi | 87% | 3123 fps | 100% |
| Rottweil R 907 | <<locked>> | 86% | 62,424 psi | 90% | 3077 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 86% | 61,221 psi | 88% | 3045 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 59,466 psi | 85% | 3045 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 61,859 psi | 89% | 3077 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 59,509 psi | 85% | 2871 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 60,365 psi | 87% | 2995 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 60,089 psi | 86% | 3120 fps | 99.9% |
| Somchem S355 | <<locked>> | 82% | 60,147 psi | 86% | 3015 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 60,394 psi | 87% | 3045 fps | 99.2% |
| Somchem S365 | <<locked>> | 88% | 59,843 psi | 86% | 3064 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 61,221 psi | 88% | 3091 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 61,206 psi | 88% | 2976 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 60,582 psi | 87% | 3048 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 60,626 psi | 87% | 3068 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 59,770 psi | 86% | 3081 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 86% | 59,973 psi | 86% | 3058 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 59,988 psi | 86% | 3097 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 59,132 psi | 85% | 3173 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 98% | 59,669 psi | 86% | 3156 fps | 99.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,289 psi | 81% | 3156 fps | 98.4% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 53,316 psi | 77% | 3150 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 59,988 psi | 86% | 2995 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 62,410 psi | 90% | 3140 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 59,582 psi | 86% | 3209 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 61,192 psi | 88% | 3091 fps | 99.9% |
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% | 38,943 psi | 56% | 2694 fps | 99% |
| Accurate 4350 | <<locked>> | 80% | 50,749 psi | 73% | 2933 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 41,423 psi | 60% | 2858 fps | 96.6% |
| Accurate MAGPRO | <<locked>> | 82% | 41,872 psi | 60% | 2854 fps | 95.3% |
| ADI APS 450 | <<locked>> | 80% | 59,030 psi | 85% | 2349 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 57,043 psi | 82% | 2976 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 41,756 psi | 60% | 2802 fps | 97.6% |
| ADI AR 2213 | <<locked>> | 82% | 40,059 psi | 58% | 2792 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 90% | 39,001 psi | 56% | 2762 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 84% | 29,820 psi | 43% | 2562 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,293 psi | 61% | 2805 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 58,972 psi | 85% | 3002 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,645 psi | 68% | 2927 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,998 psi | 79% | 3041 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,916 psi | 60% | 2799 fps | 97.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,058 psi | 55% | 2753 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,782 psi | 53% | 2710 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,256 psi | 46% | 2635 fps | 98.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,553 psi | 58% | 2864 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 50,256 psi | 72% | 2933 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 35,636 psi | 51% | 2690 fps | 95.7% |
| Bofors RP30 | <<locked>> | 86% | 36,085 psi | 52% | 2733 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 38,058 psi | 55% | 2753 fps | 96.7% |
| Bofors RP7 | <<locked>> | 80% | 52,214 psi | 75% | 2920 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 37,318 psi | 54% | 2723 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 51,517 psi | 74% | 2976 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 53,592 psi | 77% | 2979 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 80% | 40,030 psi | 57% | 2740 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 82% | 41,843 psi | 60% | 2779 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,324 psi | 65% | 2805 fps | 100% |
| Hodgdon Retumbo | 87.2 gr | 82% | 33,591 psi | 48% | 2717 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 51,358 psi | 74% | 3002 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,224 psi | 41% | 1716 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,413 psi | 68% | 2851 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,200 psi | 76% | 2940 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 47,819 psi | 69% | 2867 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,481 psi | 60% | 2736 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 82% | 38,812 psi | 56% | 2776 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 94% | 36,709 psi | 53% | 2766 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 51,271 psi | 74% | 2894 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,821 psi | 72% | 2890 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 33,997 psi | 49% | 2575 fps | 97.8% |
| Norma 204 | <<locked>> | 80% | 47,703 psi | 69% | 2897 fps | 98.7% |
| Norma 217 | <<locked>> | 88% | 30,748 psi | 44% | 2625 fps | 95% |
| Norma MRP | <<locked>> | 80% | 39,929 psi | 57% | 2825 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 49,037 psi | 70% | 2910 fps | 100% |
| Ramshot Grand | 89.7 gr | 82% | 38,551 psi | 55% | 2782 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 47,718 psi | 69% | 2910 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 32,648 psi | 47% | 2608 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,993 psi | 42% | 1759 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 58,320 psi | 84% | 3077 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,285 psi | 72% | 2946 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,022 psi | 69% | 2966 fps | 100% |
| ReloadSwiss RS 76 | 91 gr | 80% | 30,734 psi | 44% | 2625 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 41,814 psi | 60% | 2900 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 57,421 psi | 82% | 2976 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 43,091 psi | 62% | 2776 fps | 96.8% |
| Rottweil R 905 | <<locked>> | 80% | 41,466 psi | 60% | 2789 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 80% | 52,214 psi | 75% | 2920 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,271 psi | 74% | 2894 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,821 psi | 72% | 2890 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 58,059 psi | 83% | 3025 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 56,115 psi | 81% | 2828 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,328 psi | 72% | 2841 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,118 psi | 59% | 2782 fps | 97.6% |
| Somchem S355 | <<locked>> | 80% | 56,594 psi | 81% | 2963 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 43,990 psi | 63% | 2762 fps | 96.3% |
| Somchem S365 | <<locked>> | 80% | 46,325 psi | 67% | 2864 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,322 psi | 61% | 2772 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 80% | 54,317 psi | 78% | 2884 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,314 psi | 72% | 2897 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,854 psi | 53% | 2644 fps | 96.8% |
| Vihtavuori N170 | <<locked>> | 98% | 56,014 psi | 80% | 3025 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 49,821 psi | 72% | 2904 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,466 psi | 60% | 2792 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 39,871 psi | 57% | 2808 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 84% | 38,145 psi | 55% | 2753 fps | 95% |
| Vihtavuori N568 | <<locked>> | 92% | 43,018 psi | 62% | 2910 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 98% | 49,821 psi | 72% | 3084 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,226 psi | 71% | 2848 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,677 psi | 74% | 2976 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,228 psi | 48% | 2756 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,638 psi | 56% | 2694 fps | 96.8% |
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 83 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 210gr | Barnes X BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,268 fps; across all powders the maximum-charge window runs from 1,916 fps to 3,268 fps. ADI AR 2217 gives the best case fill at 100 %, and 83 of the 83 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 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. Ramshot Grand, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 210gr | Barnes X BT 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.