Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 270gr | Hornady ELD-X 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, Accurate High Country 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 3100 | <<locked>> | 92% | 62,178 psi | 89% | 2756 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 62,946 psi | 90% | 2769 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 60,147 psi | 86% | 2874 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 61,003 psi | 88% | 2881 fps | 100% |
| ADI APS 450 | <<locked>> | 82% | 61,380 psi | 88% | 2113 fps | 100% |
| ADI AR 2209 | <<locked>> | 88% | 59,640 psi | 86% | 2795 fps | 100% |
| ADI AR 2213 | <<locked>> | 92% | 61,946 psi | 89% | 2867 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 60,162 psi | 86% | 2844 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,286 psi | 75% | 2854 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,375 psi | 78% | 2812 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 59,799 psi | 86% | 2792 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 59,886 psi | 86% | 2769 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 62,874 psi | 90% | 2835 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 92% | 62,105 psi | 89% | 2861 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 59,886 psi | 86% | 2756 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 59,915 psi | 86% | 2831 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 60,974 psi | 88% | 2854 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,682 psi | 83% | 2897 fps | 99.4% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 49,008 psi | 70% | 2762 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 62,163 psi | 89% | 2835 fps | 99.6% |
| Bofors RP15 | <<locked>> | 94% | 61,192 psi | 88% | 2848 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 59,654 psi | 86% | 2858 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 62,105 psi | 89% | 2861 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 59,843 psi | 86% | 2720 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 61,888 psi | 89% | 2861 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 60,089 psi | 86% | 2776 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 62,149 psi | 89% | 2782 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 60,974 psi | 88% | 2802 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 90% | 59,799 psi | 86% | 2789 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 59,901 psi | 86% | 2690 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 59,030 psi | 85% | 2927 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 61,279 psi | 88% | 2822 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,724 psi | 54% | 1696 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 61,931 psi | 89% | 2759 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 60,988 psi | 88% | 2733 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 62,917 psi | 90% | 2756 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 61,177 psi | 88% | 2776 fps | 100% |
| IMR 7828 SSC | <<locked>> | 92% | 60,147 psi | 86% | 2854 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 96% | 59,654 psi | 86% | 2730 fps | 96.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,024 psi | 72% | 2746 fps | 100% |
| Lovex D100ᴾ | <<locked>> | 100% | 59,857 psi | 86% | 2779 fps | 96% |
| Lovex S065 | <<locked>> | 84% | 62,134 psi | 89% | 2730 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 60,510 psi | 87% | 2736 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 59,640 psi | 86% | 2726 fps | 100% |
| Norma 204 | <<locked>> | 84% | 59,727 psi | 86% | 2776 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 50,792 psi | 73% | 2766 fps | 100% |
| Norma MRP | <<locked>> | 90% | 62,395 psi | 90% | 2877 fps | 100% |
| Norma URP | <<locked>> | 84% | 60,582 psi | 87% | 2749 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 61,743 psi | 89% | 2877 fps | 100% |
| Ramshot Hunter | <<locked>> | 84% | 59,596 psi | 86% | 2766 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 59,872 psi | 86% | 2805 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,595 psi | 55% | 1736 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 58,914 psi | 85% | 2746 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 61,743 psi | 89% | 2828 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 60,104 psi | 86% | 2920 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 59,306 psi | 85% | 2897 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 60,220 psi | 87% | 2766 fps | 100% |
| Rottweil R 905 | <<locked>> | 90% | 62,772 psi | 90% | 2825 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 59,843 psi | 86% | 2720 fps | 100% |
| Shooters World 50 BMGᴾ | <<locked>> | 100% | 59,857 psi | 86% | 2779 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 84% | 62,134 psi | 89% | 2730 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 60,510 psi | 87% | 2736 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 61,293 psi | 88% | 2690 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 62,337 psi | 90% | 2822 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 61,844 psi | 89% | 2759 fps | 100% |
| Somchem S365 | <<locked>> | 86% | 62,120 psi | 89% | 2746 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 59,263 psi | 85% | 2746 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 62,250 psi | 89% | 2657 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 62,352 psi | 90% | 2740 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 62,859 psi | 90% | 2776 fps | 100% |
| Vihtavuori N170 | <<locked>> | 98% | 61,844 psi | 89% | 2822 fps | 98.6% |
| Vihtavuori N550 | <<locked>> | 84% | 61,293 psi | 88% | 2746 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 61,989 psi | 89% | 2782 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 61,786 psi | 89% | 2887 fps | 100% |
| Vihtavuori N565 | <<locked>> | 96% | 62,453 psi | 90% | 2877 fps | 100% |
| Vihtavuori N568 | <<locked>> | 98% | 59,857 psi | 86% | 2897 fps | 100% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 60,916 psi | 88% | 2959 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 61,743 psi | 89% | 2690 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 60,278 psi | 87% | 2779 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 60,089 psi | 86% | 2854 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 59,059 psi | 85% | 2746 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% | 41,814 psi | 60% | 2470 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 55,114 psi | 79% | 2674 fps | 100% |
| Accurate High Country | 85.6 gr | 80% | 45,600 psi | 66% | 2648 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 80% | 43,076 psi | 62% | 2595 fps | 98.3% |
| ADI APS 450 | <<locked>> | 80% | 59,321 psi | 85% | 2087 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 45,759 psi | 66% | 2589 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 41,118 psi | 59% | 2543 fps | 98.7% |
| ADI AR 2217 | <<locked>> | 80% | 30,690 psi | 44% | 2306 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 92% | 39,233 psi | 56% | 2589 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 28,021 psi | 40% | 2283 fps | 97.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,209 psi | 66% | 2589 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,634 psi | 76% | 2677 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,774 psi | 66% | 2585 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,800 psi | 60% | 2546 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,582 psi | 58% | 2484 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,983 psi | 50% | 2438 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,513 psi | 65% | 2644 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 39,871 psi | 57% | 2589 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 96% | 42,163 psi | 61% | 2635 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 39,987 psi | 57% | 2461 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 38,914 psi | 56% | 2490 fps | 99% |
| Bofors RP30 | <<locked>> | 80% | 32,561 psi | 47% | 2379 fps | 96.9% |
| Bofors RP5 | <<locked>> | 80% | 41,800 psi | 60% | 2546 fps | 99.5% |
| Bofors RP7 | <<locked>> | 80% | 56,260 psi | 81% | 2671 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 33,301 psi | 48% | 2375 fps | 97.5% |
| Hodgdon H414 | <<locked>> | 80% | 56,289 psi | 81% | 2726 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 58,450 psi | 84% | 2736 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 43,642 psi | 63% | 2536 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,960 psi | 62% | 2523 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,559 psi | 71% | 2559 fps | 100% |
| Hodgdon Retumbo | 82.5 gr | 80% | 34,185 psi | 49% | 2480 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 80% | 56,971 psi | 82% | 2766 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,355 psi | 41% | 1516 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,430 psi | 74% | 2618 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 80% | 57,450 psi | 83% | 2687 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 51,880 psi | 75% | 2618 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,788 psi | 64% | 2526 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 80% | 39,769 psi | 57% | 2523 fps | 98.5% |
| IMR 7977 Enduron | <<locked>> | 92% | 52,605 psi | 76% | 2625 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 84% | 29,196 psi | 42% | 2316 fps | 95.1% |
| Lovex D100 | <<locked>> | 98% | 55,738 psi | 80% | 2720 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 55,056 psi | 79% | 2638 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 53,592 psi | 77% | 2644 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,100 psi | 52% | 2359 fps | 99.8% |
| Norma 204 | <<locked>> | 80% | 52,156 psi | 75% | 2671 fps | 100% |
| Norma 217 | <<locked>> | 80% | 25,614 psi | 37% | 2228 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 44,135 psi | 63% | 2612 fps | 100% |
| Norma URP | <<locked>> | 80% | 53,447 psi | 77% | 2657 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,682 psi | 57% | 2536 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 80% | 52,170 psi | 75% | 2667 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,592 psi | 51% | 2425 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,051 psi | 42% | 1552 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 55,172 psi | 79% | 2697 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,548 psi | 77% | 2723 fps | 100% |
| ReloadSwiss RS 76 | 88.3 gr | 80% | 33,257 psi | 48% | 2457 fps | 99.4% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 32,590 psi | 47% | 2418 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 46,702 psi | 67% | 2562 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 80% | 45,252 psi | 65% | 2572 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 80% | 56,260 psi | 81% | 2671 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 98% | 55,738 psi | 80% | 2720 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 55,056 psi | 79% | 2638 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 53,592 psi | 77% | 2644 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,809 psi | 77% | 2595 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,918 psi | 65% | 2569 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 47,514 psi | 68% | 2556 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 51,039 psi | 73% | 2612 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,803 psi | 66% | 2549 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 58,537 psi | 84% | 2615 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 54,868 psi | 79% | 2644 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,972 psi | 57% | 2438 fps | 99.5% |
| Vihtavuori N170 | <<locked>> | 88% | 44,324 psi | 64% | 2549 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 54,114 psi | 78% | 2654 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 45,165 psi | 65% | 2552 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,918 psi | 63% | 2608 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 80% | 36,477 psi | 52% | 2444 fps | 97.4% |
| Vihtavuori N568 | <<locked>> | 82% | 33,895 psi | 49% | 2431 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 88% | 39,798 psi | 57% | 2598 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,969 psi | 78% | 2598 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 56,463 psi | 81% | 2730 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,203 psi | 55% | 2546 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,989 psi | 60% | 2487 fps | 99.5% |
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 | 270gr | Hornady ELD-X. Vihtavuori N570 delivers the highest muzzle velocity at 2,959 fps; across all powders the maximum-charge window runs from 1,696 fps to 2,959 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 270.0 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 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. Hodgdon Retumbo, Accurate High Country, ReloadSwiss RS 76 rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 270gr | Hornady ELD-X 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.