Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 300gr | Nosler AccuBond Long Range bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Vihtavuori N570 and Vihtavuori N568.
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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Max Load - Barrel Length: 27"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 90% | 62,598 psi | 90% | 2621 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 45,237 psi | 65% | 2523 fps | 97.8% |
| Accurate MAGPRO | <<locked>> | 88% | 61,714 psi | 89% | 2749 fps | 100% |
| ADI APS 450 | <<locked>> | 82% | 61,438 psi | 88% | 2008 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 59,959 psi | 86% | 2661 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 62,468 psi | 90% | 2733 fps | 100% |
| ADI AR 2217 | <<locked>> | 98% | 60,988 psi | 88% | 2713 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,101 psi | 82% | 2805 fps | 99.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 59,741 psi | 86% | 2736 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 59,901 psi | 86% | 2654 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 60,263 psi | 87% | 2628 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 59,292 psi | 85% | 2648 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 62,743 psi | 90% | 2723 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 60,655 psi | 87% | 2621 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 61,032 psi | 88% | 2700 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 61,975 psi | 89% | 2717 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 59,045 psi | 85% | 2779 fps | 99.9% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 54,230 psi | 78% | 2713 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 62,250 psi | 89% | 2703 fps | 100% |
| Bofors RP15 | <<locked>> | 92% | 61,830 psi | 89% | 2713 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 60,814 psi | 87% | 2730 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 62,743 psi | 90% | 2723 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 62,787 psi | 90% | 2730 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 61,134 psi | 88% | 2671 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 88% | 60,002 psi | 86% | 2654 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 60,191 psi | 86% | 2549 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 60,626 psi | 87% | 2795 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,884 psi | 54% | 1611 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 61,844 psi | 89% | 2618 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 62,903 psi | 90% | 2615 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 61,250 psi | 88% | 2644 fps | 100% |
| IMR 7828 SSC | <<locked>> | 90% | 60,800 psi | 87% | 2720 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 94% | 59,611 psi | 86% | 2608 fps | 98% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,752 psi | 79% | 2677 fps | 100% |
| Lovex D100 | <<locked>> | 98% | 60,263 psi | 87% | 2664 fps | 97.3% |
| Lovex S065 | <<locked>> | 82% | 62,047 psi | 89% | 2589 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 60,553 psi | 87% | 2598 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 60,437 psi | 87% | 2595 fps | 100% |
| Norma 204 | <<locked>> | 82% | 59,669 psi | 86% | 2638 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,072 psi | 81% | 2694 fps | 100% |
| Norma MRP | <<locked>> | 86% | 58,943 psi | 85% | 2687 fps | 100% |
| Norma URP | <<locked>> | 82% | 60,814 psi | 87% | 2608 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 62,627 psi | 90% | 2743 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 59,712 psi | 86% | 2628 fps | 100% |
| Ramshot LRTᴾ | <<locked>> | 100% | 56,507 psi | 81% | 2733 fps | 96.6% |
| Ramshot Magnum | <<locked>> | 92% | 60,597 psi | 87% | 2674 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,957 psi | 56% | 1650 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 62,047 psi | 89% | 2684 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 61,496 psi | 88% | 2785 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 60,350 psi | 87% | 2772 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 60,234 psi | 87% | 2628 fps | 100% |
| Rottweil R 905 | <<locked>> | 86% | 59,321 psi | 85% | 2644 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 98% | 60,263 psi | 87% | 2664 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 82% | 62,047 psi | 89% | 2589 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 60,553 psi | 87% | 2598 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 47,427 psi | 68% | 2536 fps | 97.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 60,713 psi | 87% | 2549 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 62,772 psi | 90% | 2687 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 61,612 psi | 89% | 2625 fps | 100% |
| Somchem S365 | <<locked>> | 84% | 62,569 psi | 90% | 2605 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 59,495 psi | 85% | 2612 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 62,352 psi | 90% | 2595 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 59,364 psi | 85% | 2598 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 62,279 psi | 89% | 2700 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 82% | 61,409 psi | 88% | 2605 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 62,642 psi | 90% | 2644 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 62,294 psi | 89% | 2749 fps | 100% |
| Vihtavuori N565 | <<locked>> | 92% | 59,292 psi | 85% | 2697 fps | 100% |
| Vihtavuori N568 | <<locked>> | 96% | 60,988 psi | 88% | 2772 fps | 100% |
| Vihtavuori N570 | <<locked>> | 98% | 62,265 psi | 89% | 2838 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 61,627 psi | 89% | 2549 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 61,569 psi | 88% | 2717 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 59,277 psi | 85% | 2612 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% | 45,049 psi | 65% | 2395 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 36,622 psi | 53% | 2356 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 80% | 46,905 psi | 67% | 2536 fps | 99.6% |
| ADI APS 450 | <<locked>> | 80% | 59,538 psi | 86% | 1985 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 49,211 psi | 71% | 2513 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 44,367 psi | 64% | 2477 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 80% | 33,214 psi | 48% | 2264 fps | 98.1% |
| ADI AR 2218 | <<locked>> | 88% | 37,173 psi | 53% | 2434 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 30,501 psi | 44% | 2244 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,429 psi | 71% | 2510 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 56,507 psi | 81% | 2582 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,965 psi | 70% | 2507 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,121 psi | 65% | 2480 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,034 psi | 63% | 2405 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,203 psi | 55% | 2375 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,806 psi | 72% | 2566 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 35,230 psi | 51% | 2372 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 90% | 37,579 psi | 54% | 2425 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 42,612 psi | 61% | 2405 fps | 97.7% |
| Bofors RP15 | <<locked>> | 80% | 42,148 psi | 61% | 2428 fps | 99.9% |
| Bofors RP30 | <<locked>> | 80% | 35,621 psi | 51% | 2329 fps | 98.8% |
| Bofors RP5 | <<locked>> | 80% | 45,121 psi | 65% | 2480 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 35,984 psi | 52% | 2326 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 80% | 46,963 psi | 67% | 2470 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,064 psi | 66% | 2454 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,098 psi | 76% | 2467 fps | 100% |
| Hodgdon Retumbo | 81.7 gr | 80% | 37,376 psi | 54% | 2434 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,529 psi | 41% | 1440 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 54,723 psi | 79% | 2530 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 55,506 psi | 80% | 2526 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,732 psi | 69% | 2454 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 80% | 43,221 psi | 62% | 2464 fps | 99.7% |
| IMR 7977 Enduron | <<locked>> | 86% | 46,340 psi | 67% | 2408 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 80% | 28,094 psi | 40% | 2175 fps | 96.1% |
| Lovex D100 | <<locked>> | 94% | 52,243 psi | 75% | 2552 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 58,378 psi | 84% | 2543 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 56,971 psi | 82% | 2552 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 39,015 psi | 56% | 2293 fps | 100% |
| Norma 204 | <<locked>> | 80% | 55,840 psi | 80% | 2589 fps | 100% |
| Norma 217 | <<locked>> | 80% | 28,282 psi | 41% | 2198 fps | 98.3% |
| Norma MRP | <<locked>> | 80% | 48,051 psi | 69% | 2539 fps | 100% |
| Norma URP | <<locked>> | 80% | 57,101 psi | 82% | 2566 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 43,540 psi | 63% | 2480 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 80% | 55,956 psi | 80% | 2582 fps | 100% |
| Ramshot LRT | <<locked>> | 98% | 52,808 psi | 76% | 2674 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 80% | 39,001 psi | 56% | 2369 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,283 psi | 42% | 1473 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 57,812 psi | 83% | 2635 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,448 psi | 52% | 2411 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 33,359 psi | 48% | 2320 fps | 96.9% |
| Rottweil R 904 | <<locked>> | 80% | 49,879 psi | 72% | 2487 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 48,747 psi | 70% | 2500 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 94% | 52,243 psi | 75% | 2552 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 58,378 psi | 84% | 2543 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 56,971 psi | 82% | 2552 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 38,624 psi | 55% | 2375 fps | 95.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 57,058 psi | 82% | 2507 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,399 psi | 70% | 2493 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 50,662 psi | 73% | 2480 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 55,042 psi | 79% | 2523 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 49,052 psi | 70% | 2470 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 58,378 psi | 84% | 2549 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 42,946 psi | 62% | 2369 fps | 100% |
| Vihtavuori N170 | <<locked>> | 84% | 41,872 psi | 60% | 2388 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 57,609 psi | 83% | 2562 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 48,631 psi | 70% | 2470 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,645 psi | 68% | 2543 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 80% | 39,682 psi | 57% | 2392 fps | 99% |
| Vihtavuori N568 | 85.2 gr | 80% | 34,737 psi | 50% | 2336 fps | 96.8% |
| Vihtavuori N570 | 86.9 gr | 82% | 35,447 psi | 51% | 2382 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 57,609 psi | 83% | 2507 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,685 psi | 61% | 2477 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,295 psi | 65% | 2421 fps | 100% |
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 73 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 300gr | Nosler AccuBond Long Range. Vihtavuori N570 delivers the highest muzzle velocity at 2,838 fps; across all powders the maximum-charge window runs from 1,611 fps to 2,838 fps. Accurate 8700 gives the best case fill at 100 %, and 73 of the 73 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 300.0 gr projectile in 0.338" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, 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, Vihtavuori N570, Vihtavuori N568 rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 300gr | Nosler AccuBond Long Range 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.