Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 286gr | SUS-TAC LRTM 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, ReloadSwiss RS 76 and Vihtavuori N570.
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>> | 92% | 62,598 psi | 90% | 2677 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 59,306 psi | 85% | 2641 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 62,366 psi | 90% | 2812 fps | 100% |
| ADI APS 450 | <<locked>> | 82% | 61,467 psi | 88% | 2041 fps | 100% |
| ADI AR 2209 | <<locked>> | 88% | 59,915 psi | 86% | 2713 fps | 100% |
| ADI AR 2213 | <<locked>> | 92% | 62,439 psi | 90% | 2792 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 60,481 psi | 87% | 2766 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,547 psi | 75% | 2779 fps | 99.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,781 psi | 79% | 2736 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 60,089 psi | 86% | 2713 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 60,365 psi | 87% | 2687 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 59,422 psi | 85% | 2707 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 92% | 62,598 psi | 90% | 2779 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 60,365 psi | 87% | 2677 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 60,408 psi | 87% | 2753 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 61,438 psi | 88% | 2776 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,928 psi | 83% | 2822 fps | 99.6% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 49,226 psi | 71% | 2694 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 62,439 psi | 90% | 2753 fps | 99.8% |
| Bofors RP15 | <<locked>> | 94% | 61,482 psi | 88% | 2766 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 60,104 psi | 86% | 2779 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 62,598 psi | 90% | 2779 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 60,133 psi | 86% | 2638 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 62,294 psi | 89% | 2782 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 61,293 psi | 88% | 2687 fps | 100% |
| Hodgdon H4831 | <<locked>> | 94% | 60,930 psi | 88% | 2720 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 90% | 60,307 psi | 87% | 2710 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 60,466 psi | 87% | 2612 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 59,437 psi | 85% | 2844 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 61,641 psi | 89% | 2740 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,753 psi | 54% | 1637 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 62,816 psi | 90% | 2648 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 62,395 psi | 90% | 2677 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 61,351 psi | 88% | 2651 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 60,858 psi | 87% | 2648 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 61,554 psi | 88% | 2697 fps | 100% |
| IMR 7828 SSC | <<locked>> | 90% | 60,611 psi | 87% | 2776 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 96% | 59,973 psi | 86% | 2654 fps | 97.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,270 psi | 72% | 2671 fps | 100% |
| Lovex D100ᴾ | <<locked>> | 100% | 60,191 psi | 86% | 2707 fps | 96.5% |
| Lovex S065 | <<locked>> | 84% | 62,584 psi | 90% | 2648 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 60,988 psi | 88% | 2657 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 60,133 psi | 86% | 2648 fps | 100% |
| Norma 204 | <<locked>> | 84% | 60,133 psi | 86% | 2697 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 51,271 psi | 74% | 2690 fps | 100% |
| Norma MRP | <<locked>> | 90% | 62,961 psi | 90% | 2795 fps | 100% |
| Norma URP | <<locked>> | 84% | 61,090 psi | 88% | 2671 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 60,974 psi | 88% | 2782 fps | 100% |
| Ramshot Hunter | <<locked>> | 84% | 59,988 psi | 86% | 2687 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 62,410 psi | 90% | 2749 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,653 psi | 56% | 1673 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 59,451 psi | 85% | 2667 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 62,207 psi | 89% | 2746 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 60,394 psi | 87% | 2838 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 59,611 psi | 86% | 2822 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 60,611 psi | 87% | 2684 fps | 100% |
| Rottweil R 905 | <<locked>> | 88% | 59,379 psi | 85% | 2700 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 60,133 psi | 86% | 2638 fps | 100% |
| Shooters World 50 BMGᴾ | <<locked>> | 100% | 60,191 psi | 86% | 2707 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 62,584 psi | 90% | 2648 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 60,988 psi | 88% | 2657 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 43,468 psi | 62% | 2513 fps | 96.2% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 61,438 psi | 88% | 2612 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 62,758 psi | 90% | 2743 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 62,149 psi | 89% | 2680 fps | 100% |
| Somchem S365 | <<locked>> | 86% | 62,671 psi | 90% | 2667 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 59,611 psi | 86% | 2667 fps | 100% |
| Unknown powder | <<locked>> | 82% | 60,959 psi | 88% | 2671 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 59,872 psi | 86% | 2552 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 61,264 psi | 88% | 2635 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 61,163 psi | 88% | 2674 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 55,883 psi | 80% | 2661 fps | 98.1% |
| Vihtavuori N550 | <<locked>> | 82% | 61,888 psi | 89% | 2684 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 62,511 psi | 90% | 2703 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 62,917 psi | 90% | 2818 fps | 100% |
| Vihtavuori N565 | <<locked>> | 96% | 62,801 psi | 90% | 2795 fps | 100% |
| Vihtavuori N568 | <<locked>> | 98% | 60,075 psi | 86% | 2818 fps | 100% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 61,975 psi | 89% | 2884 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 62,163 psi | 89% | 2612 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 60,423 psi | 87% | 2772 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 60,785 psi | 87% | 2684 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% | 42,105 psi | 60% | 2398 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 55,405 psi | 80% | 2592 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,176 psi | 59% | 2480 fps | 97.7% |
| ADI APS 450 | <<locked>> | 80% | 59,321 psi | 85% | 2014 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 46,180 psi | 66% | 2516 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 41,408 psi | 59% | 2474 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 80% | 30,951 psi | 44% | 2247 fps | 96.4% |
| ADI AR 2218 | <<locked>> | 92% | 39,537 psi | 57% | 2526 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 28,224 psi | 41% | 2228 fps | 98.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,485 psi | 67% | 2516 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,156 psi | 76% | 2598 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,050 psi | 66% | 2510 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,105 psi | 60% | 2477 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,915 psi | 59% | 2415 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,346 psi | 51% | 2372 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,861 psi | 66% | 2569 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 37,333 psi | 54% | 2464 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 94% | 39,436 psi | 57% | 2513 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 40,248 psi | 58% | 2398 fps | 96.2% |
| Bofors RP15 | <<locked>> | 80% | 39,262 psi | 56% | 2425 fps | 99.4% |
| Bofors RP30 | <<locked>> | 80% | 32,837 psi | 47% | 2320 fps | 97.5% |
| Bofors RP5 | <<locked>> | 80% | 42,105 psi | 60% | 2477 fps | 99.7% |
| Bofors RP7 | <<locked>> | 80% | 56,594 psi | 81% | 2592 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 31,763 psi | 46% | 2270 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 80% | 54,114 psi | 78% | 2592 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 38,943 psi | 56% | 2372 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,250 psi | 62% | 2454 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,864 psi | 72% | 2480 fps | 100% |
| Hodgdon Retumbo | 79.4 gr | 80% | 34,476 psi | 50% | 2418 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 80% | 57,334 psi | 82% | 2687 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,297 psi | 41% | 1460 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 59,161 psi | 85% | 2602 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,822 psi | 74% | 2543 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 80% | 57,783 psi | 83% | 2608 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,718 psi | 69% | 2477 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,121 psi | 65% | 2457 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 80% | 42,786 psi | 61% | 2510 fps | 99.3% |
| IMR 7977 Enduron | <<locked>> | 90% | 49,559 psi | 71% | 2503 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 84% | 29,515 psi | 42% | 2260 fps | 95.9% |
| Lovex D100 | <<locked>> | 98% | 56,057 psi | 81% | 2651 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 55,405 psi | 80% | 2559 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 53,940 psi | 77% | 2566 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,376 psi | 52% | 2297 fps | 99.9% |
| Norma 204 | <<locked>> | 80% | 52,576 psi | 76% | 2595 fps | 100% |
| Norma 217 | <<locked>> | 80% | 25,889 psi | 37% | 2175 fps | 96.5% |
| Norma MRP | <<locked>> | 80% | 44,469 psi | 64% | 2539 fps | 100% |
| Norma URP | <<locked>> | 80% | 53,824 psi | 77% | 2579 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,991 psi | 65% | 2559 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 80% | 52,620 psi | 76% | 2592 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 39,566 psi | 57% | 2431 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,022 psi | 42% | 1496 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 55,550 psi | 80% | 2618 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 54,041 psi | 78% | 2648 fps | 100% |
| ReloadSwiss RS 76 | 85 gr | 80% | 33,504 psi | 48% | 2398 fps | 99.7% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 32,866 psi | 47% | 2359 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 47,036 psi | 68% | 2490 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 45,629 psi | 66% | 2500 fps | 100% |
| Rottweil R 907 | <<locked>> | 80% | 56,594 psi | 81% | 2592 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 98% | 56,057 psi | 81% | 2651 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 55,405 psi | 80% | 2559 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 53,940 psi | 77% | 2566 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 40,611 psi | 58% | 2461 fps | 95.3% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 54,201 psi | 78% | 2520 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,324 psi | 65% | 2497 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 47,877 psi | 69% | 2484 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 51,517 psi | 74% | 2536 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,108 psi | 66% | 2477 fps | 100% |
| Unknown powder | <<locked>> | 80% | 57,145 psi | 82% | 2625 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 52,953 psi | 76% | 2467 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 57,246 psi | 82% | 2589 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,146 psi | 56% | 2352 fps | 99.6% |
| Vihtavuori N170 | <<locked>> | 92% | 43,482 psi | 62% | 2461 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 57,899 psi | 83% | 2635 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 45,513 psi | 65% | 2480 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,163 psi | 61% | 2500 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 80% | 36,825 psi | 53% | 2385 fps | 97.9% |
| Vihtavuori N568 | <<locked>> | 82% | 34,301 psi | 49% | 2375 fps | 95.9% |
| Vihtavuori N570 | 89.6 gr | 86% | 37,710 psi | 54% | 2477 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 54,259 psi | 78% | 2523 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,711 psi | 56% | 2477 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,064 psi | 66% | 2484 fps | 99.9% |
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 | 286gr | SUS-TAC LRTM. Vihtavuori N570 delivers the highest muzzle velocity at 2,884 fps; across all powders the maximum-charge window runs from 1,637 fps to 2,884 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 286.0 gr projectile in 0.338" calls for a 1:9.0 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. Hodgdon Retumbo, ReloadSwiss RS 76, Vihtavuori N570 rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 286gr | SUS-TAC LRTM 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.