Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 272gr | SUS-TAC HPT bullet and 79 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% | 62,613 psi | 90% | 2690 fps | 100% |
| Accurate 3100 | <<locked>> | 92% | 60,350 psi | 87% | 2720 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 61,351 psi | 88% | 2733 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 60,133 psi | 86% | 2848 fps | 99.8% |
| ADI APS 450 | <<locked>> | 82% | 61,279 psi | 88% | 2090 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 62,120 psi | 89% | 2808 fps | 100% |
| ADI AR 2213 | <<locked>> | 92% | 60,133 psi | 86% | 2828 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 58,189 psi | 84% | 2802 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 50,575 psi | 73% | 2805 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,576 psi | 76% | 2772 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 62,207 psi | 89% | 2779 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 61,293 psi | 88% | 2795 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 92% | 60,379 psi | 87% | 2822 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 94% | 62,076 psi | 89% | 2766 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 62,178 psi | 89% | 2844 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 59,030 psi | 85% | 2818 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,434 psi | 80% | 2848 fps | 99% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 46,934 psi | 67% | 2713 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 60,582 psi | 87% | 2795 fps | 99.5% |
| Bofors RP15 | <<locked>> | 94% | 59,495 psi | 85% | 2808 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 61,786 psi | 89% | 2867 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 60,379 psi | 87% | 2822 fps | 100% |
| Bofors RP7 | <<locked>> | 84% | 62,192 psi | 89% | 2730 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 59,915 psi | 86% | 2822 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 59,596 psi | 86% | 2733 fps | 100% |
| Hodgdon H4831 | <<locked>> | 96% | 62,874 psi | 90% | 2808 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 92% | 62,279 psi | 89% | 2802 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 62,337 psi | 90% | 2700 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 61,046 psi | 88% | 2936 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 59,466 psi | 85% | 2782 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,637 psi | 54% | 1677 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 61,134 psi | 88% | 2694 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 60,626 psi | 87% | 2723 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 59,770 psi | 86% | 2700 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 62,685 psi | 90% | 2736 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 59,930 psi | 86% | 2743 fps | 100% |
| IMR 7828 SSC | <<locked>> | 92% | 62,598 psi | 90% | 2867 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 98% | 62,004 psi | 89% | 2740 fps | 97.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,124 psi | 69% | 2703 fps | 99.8% |
| Lovex S065 | <<locked>> | 84% | 60,945 psi | 88% | 2697 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 62,932 psi | 90% | 2746 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 61,801 psi | 89% | 2733 fps | 100% |
| Norma 204 | <<locked>> | 86% | 62,105 psi | 89% | 2789 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 48,921 psi | 70% | 2723 fps | 100% |
| Norma MRP | <<locked>> | 90% | 60,582 psi | 87% | 2838 fps | 100% |
| Norma URP | <<locked>> | 86% | 62,961 psi | 90% | 2759 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 58,610 psi | 84% | 2822 fps | 100% |
| Ramshot Hunter | <<locked>> | 86% | 61,859 psi | 89% | 2779 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 59,915 psi | 86% | 2789 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,508 psi | 55% | 1716 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 61,496 psi | 88% | 2759 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 59,959 psi | 86% | 2792 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 62,308 psi | 90% | 2933 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 61,482 psi | 88% | 2910 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 62,671 psi | 90% | 2776 fps | 100% |
| Rottweil R 905 | <<locked>> | 90% | 61,293 psi | 88% | 2789 fps | 100% |
| Rottweil R 907 | <<locked>> | 84% | 62,192 psi | 89% | 2730 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 60,945 psi | 88% | 2697 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 62,932 psi | 90% | 2746 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 62,874 psi | 90% | 2566 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 59,988 psi | 86% | 2657 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 60,872 psi | 87% | 2785 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 60,408 psi | 87% | 2723 fps | 100% |
| Somchem S365 | <<locked>> | 86% | 60,539 psi | 87% | 2713 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 61,467 psi | 88% | 2756 fps | 100% |
| Unknown powder | <<locked>> | 82% | 59,176 psi | 85% | 2717 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 61,772 psi | 89% | 2638 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 59,451 psi | 85% | 2680 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 59,277 psi | 85% | 2717 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 53,969 psi | 78% | 2690 fps | 97.3% |
| Vihtavuori N550 | <<locked>> | 82% | 60,075 psi | 86% | 2730 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 60,365 psi | 87% | 2749 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 60,785 psi | 87% | 2858 fps | 100% |
| Vihtavuori N565 | <<locked>> | 96% | 60,524 psi | 87% | 2835 fps | 100% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 61,815 psi | 89% | 2904 fps | 100% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 59,480 psi | 85% | 2917 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 60,249 psi | 87% | 2657 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 62,134 psi | 89% | 2864 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 58,929 psi | 85% | 2726 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% | 58,842 psi | 85% | 2644 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 40,625 psi | 58% | 2434 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 53,650 psi | 77% | 2638 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 39,610 psi | 57% | 2510 fps | 96.7% |
| ADI APS 450 | <<locked>> | 80% | 59,350 psi | 85% | 2064 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 44,657 psi | 64% | 2552 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 39,987 psi | 57% | 2503 fps | 98.4% |
| ADI AR 2217 | <<locked>> | 80% | 29,776 psi | 43% | 2267 fps | 95% |
| ADI AR 2218 | <<locked>> | 94% | 40,828 psi | 59% | 2608 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 27,180 psi | 39% | 2244 fps | 97.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,300 psi | 74% | 2641 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,570 psi | 64% | 2546 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,596 psi | 58% | 2510 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,378 psi | 57% | 2451 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,982 psi | 49% | 2402 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,048 psi | 63% | 2605 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 38,377 psi | 55% | 2543 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 96% | 40,451 psi | 58% | 2589 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 39,117 psi | 56% | 2425 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 37,739 psi | 54% | 2451 fps | 98.8% |
| Bofors RP30 | <<locked>> | 80% | 31,430 psi | 45% | 2339 fps | 96.3% |
| Bofors RP5 | <<locked>> | 80% | 40,596 psi | 58% | 2510 fps | 99.3% |
| Bofors RP7 | <<locked>> | 80% | 54,969 psi | 79% | 2635 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 30,545 psi | 44% | 2290 fps | 96.2% |
| Hodgdon H4350 | <<locked>> | 80% | 52,634 psi | 76% | 2638 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 37,681 psi | 54% | 2405 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,843 psi | 60% | 2487 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,341 psi | 69% | 2523 fps | 100% |
| Hodgdon Retumbo | 79.9 gr | 80% | 33,127 psi | 48% | 2441 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 80% | 55,317 psi | 79% | 2730 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,253 psi | 41% | 1496 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 57,580 psi | 83% | 2648 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,386 psi | 72% | 2585 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 80% | 56,173 psi | 81% | 2651 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 46,093 psi | 66% | 2516 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,845 psi | 63% | 2493 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 80% | 41,205 psi | 59% | 2539 fps | 98.7% |
| IMR 7977 Enduron | <<locked>> | 92% | 51,256 psi | 74% | 2585 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 86% | 30,153 psi | 43% | 2329 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 53,940 psi | 77% | 2605 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,286 psi | 75% | 2608 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,099 psi | 50% | 2326 fps | 99.7% |
| Norma 204 | <<locked>> | 80% | 50,952 psi | 73% | 2635 fps | 100% |
| Norma 217 | <<locked>> | 80% | 24,801 psi | 36% | 2192 fps | 95% |
| Norma MRP | <<locked>> | 80% | 42,917 psi | 62% | 2575 fps | 100% |
| Norma URP | <<locked>> | 80% | 52,040 psi | 75% | 2621 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 43,105 psi | 62% | 2585 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 80% | 50,966 psi | 73% | 2631 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,855 psi | 54% | 2457 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,964 psi | 42% | 1535 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,693 psi | 77% | 2661 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,112 psi | 75% | 2690 fps | 100% |
| ReloadSwiss RS 76 | 85.5 gr | 80% | 32,140 psi | 46% | 2415 fps | 99.1% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 33,823 psi | 49% | 2434 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 45,672 psi | 66% | 2526 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 80% | 44,135 psi | 63% | 2536 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 80% | 54,969 psi | 79% | 2635 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,940 psi | 77% | 2605 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,286 psi | 75% | 2608 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 59,161 psi | 85% | 2526 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,794 psi | 76% | 2562 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,787 psi | 63% | 2533 fps | 99.7% |
| Somchem S361 | <<locked>> | 80% | 46,412 psi | 67% | 2520 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 49,777 psi | 72% | 2579 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,628 psi | 64% | 2513 fps | 99.9% |
| Unknown powder | <<locked>> | 80% | 55,463 psi | 80% | 2667 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 51,590 psi | 74% | 2513 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 55,564 psi | 80% | 2635 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,710 psi | 54% | 2382 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 94% | 44,672 psi | 64% | 2539 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 56,217 psi | 81% | 2680 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,772 psi | 63% | 2516 fps | 100% |
| Vihtavuori N560 | 81.2 gr | 80% | 40,611 psi | 58% | 2530 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 80% | 35,389 psi | 51% | 2408 fps | 97% |
| Vihtavuori N568 | <<locked>> | 84% | 35,259 psi | 51% | 2454 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 90% | 41,524 psi | 60% | 2615 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,605 psi | 76% | 2566 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,709 psi | 53% | 2507 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,483 psi | 64% | 2516 fps | 99.7% |
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 86 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 272gr | SUS-TAC HPT. Hodgdon Retumbo delivers the highest muzzle velocity at 2,936 fps; across all powders the maximum-charge window runs from 1,677 fps to 2,936 fps. Accurate 8700 gives the best case fill at 100 %, and 86 of the 86 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 272.0 gr projectile in 0.338" calls for a 1:9.0 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 | 272gr | SUS-TAC HPT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, Ramshot LRT, SNPE Vectan SP 13 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.