Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 300gr | Nosler AccuBond bullet and 71 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and Alliant Reloder-33.
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>> | 88% | 59,886 psi | 86% | 2595 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 46,586 psi | 67% | 2549 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 88% | 59,915 psi | 86% | 2730 fps | 100% |
| ADI APS 450 | <<locked>> | 82% | 61,554 psi | 88% | 2021 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 61,148 psi | 88% | 2680 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 59,669 psi | 86% | 2703 fps | 100% |
| ADI AR 2217 | <<locked>> | 98% | 62,671 psi | 90% | 2736 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 58,784 psi | 84% | 2831 fps | 100% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 61,641 psi | 89% | 2756 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 61,496 psi | 88% | 2648 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 60,597 psi | 87% | 2671 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 60,060 psi | 86% | 2697 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 62,105 psi | 89% | 2641 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 62,613 psi | 90% | 2720 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 59,117 psi | 85% | 2687 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 60,626 psi | 87% | 2805 fps | 100% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,159 psi | 81% | 2746 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 59,654 psi | 86% | 2677 fps | 99.9% |
| Bofors RP15 | <<locked>> | 90% | 59,379 psi | 85% | 2687 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 62,294 psi | 89% | 2753 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 60,060 psi | 86% | 2697 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 60,350 psi | 87% | 2707 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 61,946 psi | 89% | 2648 fps | 100% |
| Hodgdon H4831 | <<locked>> | 92% | 62,221 psi | 89% | 2687 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 88% | 61,279 psi | 88% | 2677 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 61,337 psi | 88% | 2569 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 62,395 psi | 90% | 2818 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,000 psi | 55% | 1621 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 59,190 psi | 85% | 2592 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 62,062 psi | 89% | 2608 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 62,250 psi | 89% | 2661 fps | 100% |
| IMR 7828 SSC | <<locked>> | 88% | 62,236 psi | 89% | 2743 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 94% | 60,814 psi | 87% | 2631 fps | 98.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,318 psi | 81% | 2703 fps | 100% |
| Lovex D100 | <<locked>> | 98% | 61,801 psi | 89% | 2690 fps | 97.7% |
| Lovex S070 | <<locked>> | 82% | 61,641 psi | 89% | 2615 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 61,786 psi | 89% | 2618 fps | 100% |
| Norma 204 | <<locked>> | 82% | 60,858 psi | 87% | 2657 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,754 psi | 83% | 2717 fps | 100% |
| Norma MRP | <<locked>> | 86% | 60,336 psi | 87% | 2710 fps | 100% |
| Norma URP | <<locked>> | 82% | 61,931 psi | 89% | 2628 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 58,305 psi | 84% | 2697 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 60,916 psi | 88% | 2648 fps | 100% |
| Ramshot LRTᴾ | <<locked>> | 100% | 58,102 psi | 83% | 2759 fps | 97% |
| Ramshot Magnum | <<locked>> | 88% | 59,625 psi | 86% | 2667 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,073 psi | 56% | 1660 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 59,001 psi | 85% | 2759 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 62,308 psi | 90% | 2799 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 61,380 psi | 88% | 2648 fps | 100% |
| Rottweil R 905 | <<locked>> | 86% | 60,539 psi | 87% | 2664 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 98% | 61,801 psi | 89% | 2690 fps | 97.7% |
| Shooters World SW4350 | <<locked>> | 82% | 61,641 psi | 89% | 2615 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 48,689 psi | 70% | 2559 fps | 98.2% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 61,873 psi | 89% | 2569 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 60,147 psi | 86% | 2661 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 62,874 psi | 90% | 2644 fps | 100% |
| Somchem S365 | <<locked>> | 82% | 59,915 psi | 86% | 2582 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 60,626 psi | 87% | 2628 fps | 100% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 46,644 psi | 67% | 2549 fps | 96.3% |
| Vihtavuori 24N41ᴾ | <<locked>> | 100% | 58,929 psi | 85% | 2723 fps | 96.9% |
| Vihtavuori N150 | <<locked>> | 82% | 60,379 psi | 87% | 2507 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 62,685 psi | 90% | 2641 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 61,322 psi | 88% | 2694 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 86% | 60,176 psi | 86% | 2621 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 60,582 psi | 87% | 2736 fps | 100% |
| Vihtavuori N565 | <<locked>> | 92% | 60,684 psi | 87% | 2720 fps | 100% |
| Vihtavuori N568 | <<locked>> | 96% | 62,540 psi | 90% | 2795 fps | 100% |
| Vihtavuori N570 | <<locked>> | 96% | 60,452 psi | 87% | 2812 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 62,874 psi | 90% | 2566 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 88% | 59,016 psi | 85% | 2690 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 61,873 psi | 89% | 2648 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% | 46,079 psi | 66% | 2415 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 37,681 psi | 54% | 2385 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 80% | 45,542 psi | 65% | 2516 fps | 99.1% |
| ADI APS 450 | <<locked>> | 80% | 59,509 psi | 85% | 1995 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 50,270 psi | 72% | 2533 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 45,411 psi | 65% | 2497 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 80% | 33,924 psi | 49% | 2283 fps | 98.4% |
| ADI AR 2218 | <<locked>> | 86% | 35,592 psi | 51% | 2398 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 31,285 psi | 45% | 2267 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 57,769 psi | 83% | 2602 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,980 psi | 72% | 2526 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,166 psi | 66% | 2500 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,005 psi | 65% | 2425 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,247 psi | 56% | 2395 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,271 psi | 74% | 2589 fps | 100% |
| Alliant Reloder-33 | 94.6 gr | 84% | 36,347 psi | 52% | 2398 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 88% | 36,230 psi | 52% | 2395 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,265 psi | 62% | 2421 fps | 98% |
| Bofors RP15 | <<locked>> | 80% | 43,033 psi | 62% | 2444 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 36,593 psi | 53% | 2352 fps | 99.1% |
| Bofors RP5 | <<locked>> | 80% | 46,166 psi | 66% | 2500 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 34,853 psi | 50% | 2303 fps | 99% |
| Hodgdon H4350 | <<locked>> | 80% | 58,160 psi | 84% | 2598 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 42,438 psi | 61% | 2398 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,021 psi | 68% | 2477 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 54,114 psi | 78% | 2484 fps | 100% |
| Hodgdon Retumbo | 83.5 gr | 80% | 38,363 psi | 55% | 2457 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,572 psi | 41% | 1447 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 55,753 psi | 80% | 2549 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 51,634 psi | 74% | 2480 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,660 psi | 70% | 2474 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 80% | 47,181 psi | 68% | 2533 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 86% | 47,224 psi | 68% | 2431 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 80% | 28,848 psi | 41% | 2195 fps | 96.5% |
| Lovex D100 | <<locked>> | 92% | 50,024 psi | 72% | 2526 fps | 95.4% |
| Lovex S070 | <<locked>> | 80% | 57,870 psi | 83% | 2569 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 39,900 psi | 57% | 2313 fps | 100% |
| Norma 204 | <<locked>> | 80% | 56,884 psi | 82% | 2605 fps | 100% |
| Norma 217 | <<locked>> | 80% | 29,182 psi | 42% | 2221 fps | 98.7% |
| Norma MRP | <<locked>> | 80% | 49,124 psi | 71% | 2559 fps | 100% |
| Norma URP | <<locked>> | 80% | 58,088 psi | 83% | 2582 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 50,299 psi | 72% | 2589 fps | 100% |
| Ramshot Hunter | <<locked>> | 80% | 56,985 psi | 82% | 2598 fps | 100% |
| Ramshot LRT | <<locked>> | 96% | 50,546 psi | 73% | 2644 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 80% | 44,063 psi | 63% | 2457 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,327 psi | 42% | 1483 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,594 psi | 54% | 2438 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 34,476 psi | 50% | 2346 fps | 97.4% |
| Rottweil R 904 | <<locked>> | 80% | 50,850 psi | 73% | 2507 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 49,792 psi | 72% | 2520 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 50,024 psi | 72% | 2526 fps | 95.4% |
| Shooters World SW4350 | <<locked>> | 80% | 57,870 psi | 83% | 2569 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 37,246 psi | 54% | 2352 fps | 95.1% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 58,030 psi | 83% | 2523 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,443 psi | 71% | 2516 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 51,619 psi | 74% | 2500 fps | 100% |
| Somchem S365 | <<locked>> | 80% | 56,275 psi | 81% | 2539 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 50,038 psi | 72% | 2490 fps | 100% |
| Vihtavuori 20N29 | <<locked>> | 98% | 43,381 psi | 62% | 2493 fps | 95.4% |
| Vihtavuori 24N41 | <<locked>> | 96% | 51,271 psi | 74% | 2612 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 56,782 psi | 82% | 2464 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 42,656 psi | 61% | 2369 fps | 100% |
| Vihtavuori N170 | <<locked>> | 86% | 39,479 psi | 57% | 2346 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 49,777 psi | 72% | 2490 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,383 psi | 67% | 2530 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 80% | 40,756 psi | 59% | 2415 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 80% | 35,766 psi | 51% | 2359 fps | 97.2% |
| Vihtavuori N570 | 89.7 gr | 82% | 36,608 psi | 53% | 2408 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 58,885 psi | 85% | 2523 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,932 psi | 63% | 2497 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,227 psi | 72% | 2500 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 71 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 300gr | Nosler AccuBond. ADI AR 2218 delivers the highest muzzle velocity at 2,831 fps; across all powders the maximum-charge window runs from 1,621 fps to 2,831 fps. Accurate 8700 gives the best case fill at 100 %, and 71 of the 71 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (480 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.338" calls for a 1:12.0 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. Vihtavuori N570, Hodgdon Retumbo, Alliant Reloder-33 rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 300gr | Nosler AccuBond 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.