Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 300gr | Berger Elite Hunter bullet and 73 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 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>> | 88% | 59,350 psi | 85% | 2585 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 45,948 psi | 66% | 2539 fps | 98% |
| Accurate MAGPRO | <<locked>> | 88% | 62,511 psi | 90% | 2762 fps | 100% |
| ADI APS 450 | <<locked>> | 82% | 61,467 psi | 88% | 2014 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 60,408 psi | 87% | 2667 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 59,132 psi | 85% | 2697 fps | 100% |
| ADI AR 2217 | <<locked>> | 98% | 61,786 psi | 89% | 2726 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,870 psi | 83% | 2818 fps | 100% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 60,771 psi | 87% | 2749 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 60,887 psi | 87% | 2638 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 59,886 psi | 86% | 2661 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 59,524 psi | 86% | 2687 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 61,351 psi | 88% | 2631 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 61,917 psi | 89% | 2710 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 62,656 psi | 90% | 2726 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 59,901 psi | 86% | 2792 fps | 99.9% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,259 psi | 79% | 2733 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 62,845 psi | 90% | 2713 fps | 100% |
| Bofors RP15 | <<locked>> | 92% | 62,671 psi | 90% | 2726 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 61,612 psi | 89% | 2743 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 59,524 psi | 86% | 2687 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 59,437 psi | 85% | 2694 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 61,772 psi | 89% | 2680 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 88% | 60,785 psi | 87% | 2667 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 60,930 psi | 88% | 2562 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 61,554 psi | 88% | 2808 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,927 psi | 54% | 1617 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 62,482 psi | 90% | 2628 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 59,828 psi | 86% | 2582 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 61,815 psi | 89% | 2654 fps | 100% |
| IMR 7828 SSC | <<locked>> | 90% | 61,496 psi | 88% | 2730 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 94% | 60,263 psi | 87% | 2621 fps | 98.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,695 psi | 80% | 2694 fps | 100% |
| Lovex D100 | <<locked>> | 98% | 60,988 psi | 88% | 2677 fps | 97.5% |
| Lovex S065 | <<locked>> | 82% | 62,526 psi | 90% | 2598 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 61,076 psi | 88% | 2605 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 61,090 psi | 88% | 2608 fps | 100% |
| Norma 204 | <<locked>> | 82% | 60,350 psi | 87% | 2648 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,913 psi | 82% | 2703 fps | 100% |
| Norma MRP | <<locked>> | 86% | 59,785 psi | 86% | 2700 fps | 100% |
| Norma URP | <<locked>> | 82% | 61,337 psi | 88% | 2618 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 58,958 psi | 85% | 2703 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 60,394 psi | 87% | 2638 fps | 100% |
| Ramshot LRTᴾ | <<locked>> | 100% | 57,450 psi | 83% | 2749 fps | 96.9% |
| Ramshot Magnum | <<locked>> | 92% | 61,380 psi | 88% | 2684 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,001 psi | 56% | 1657 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 62,758 psi | 90% | 2694 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 62,569 psi | 90% | 2799 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 61,293 psi | 88% | 2785 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 60,887 psi | 87% | 2638 fps | 100% |
| Rottweil R 905 | <<locked>> | 86% | 59,770 psi | 86% | 2651 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 98% | 60,988 psi | 88% | 2677 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 82% | 62,526 psi | 90% | 2598 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 61,076 psi | 88% | 2605 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 48,037 psi | 69% | 2546 fps | 98% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 61,366 psi | 88% | 2562 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 59,379 psi | 85% | 2648 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 62,294 psi | 89% | 2638 fps | 100% |
| Somchem S365 | <<locked>> | 82% | 59,480 psi | 85% | 2575 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 60,118 psi | 86% | 2621 fps | 100% |
| Vihtavuori 24N41ᴾ | <<locked>> | 100% | 55,680 psi | 80% | 2664 fps | 96.1% |
| Vihtavuori N160 | <<locked>> | 82% | 62,845 psi | 90% | 2605 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 59,988 psi | 86% | 2608 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 58,958 psi | 85% | 2657 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 82% | 61,917 psi | 89% | 2615 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 59,567 psi | 86% | 2612 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 59,117 psi | 85% | 2713 fps | 100% |
| Vihtavuori N565 | <<locked>> | 92% | 59,872 psi | 86% | 2707 fps | 100% |
| Vihtavuori N568 | <<locked>> | 96% | 61,714 psi | 89% | 2782 fps | 100% |
| Vihtavuori N570 | <<locked>> | 96% | 59,030 psi | 85% | 2799 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 62,221 psi | 89% | 2559 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 62,468 psi | 90% | 2726 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 59,872 psi | 86% | 2625 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% | 45,701 psi | 66% | 2405 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 37,115 psi | 53% | 2369 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 80% | 47,369 psi | 68% | 2546 fps | 99.6% |
| ADI APS 450 | <<locked>> | 80% | 59,596 psi | 86% | 1991 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 49,705 psi | 71% | 2523 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 45,020 psi | 65% | 2490 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 80% | 33,605 psi | 48% | 2274 fps | 98.2% |
| ADI AR 2218 | <<locked>> | 86% | 35,157 psi | 51% | 2388 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 30,864 psi | 44% | 2254 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 57,116 psi | 82% | 2592 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,603 psi | 71% | 2520 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,774 psi | 66% | 2490 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,570 psi | 64% | 2415 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,696 psi | 56% | 2385 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,502 psi | 73% | 2579 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 35,868 psi | 52% | 2385 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 90% | 38,348 psi | 55% | 2441 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 42,917 psi | 62% | 2411 fps | 97.8% |
| Bofors RP15 | <<locked>> | 80% | 42,656 psi | 61% | 2438 fps | 99.9% |
| Bofors RP30 | <<locked>> | 80% | 36,216 psi | 52% | 2346 fps | 99% |
| Bofors RP5 | <<locked>> | 80% | 45,774 psi | 66% | 2490 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 36,521 psi | 52% | 2339 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 80% | 47,427 psi | 68% | 2480 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,673 psi | 67% | 2467 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,664 psi | 77% | 2477 fps | 100% |
| Hodgdon Retumbo | 82.6 gr | 80% | 37,826 psi | 54% | 2448 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,543 psi | 41% | 1444 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 55,230 psi | 79% | 2539 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 56,072 psi | 81% | 2536 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,196 psi | 69% | 2464 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 80% | 43,758 psi | 63% | 2474 fps | 99.8% |
| IMR 7977 Enduron | <<locked>> | 86% | 46,847 psi | 67% | 2421 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 80% | 28,500 psi | 41% | 2185 fps | 96.3% |
| Lovex D100 | <<locked>> | 92% | 49,385 psi | 71% | 2513 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 58,885 psi | 85% | 2552 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 57,464 psi | 83% | 2562 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 39,523 psi | 57% | 2303 fps | 100% |
| Norma 204 | <<locked>> | 80% | 56,304 psi | 81% | 2595 fps | 100% |
| Norma 217 | <<locked>> | 80% | 28,703 psi | 41% | 2211 fps | 98.5% |
| Norma MRP | <<locked>> | 80% | 48,573 psi | 70% | 2549 fps | 100% |
| Norma URP | <<locked>> | 80% | 57,638 psi | 83% | 2572 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,077 psi | 63% | 2490 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 80% | 56,449 psi | 81% | 2589 fps | 100% |
| Ramshot LRT | <<locked>> | 96% | 49,937 psi | 72% | 2631 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 80% | 39,610 psi | 57% | 2382 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,298 psi | 42% | 1476 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 58,523 psi | 84% | 2644 fps | 100% |
| ReloadSwiss RS 76 | 88.4 gr | 80% | 37,014 psi | 53% | 2425 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 33,910 psi | 49% | 2333 fps | 97.2% |
| Rottweil R 904 | <<locked>> | 80% | 50,357 psi | 72% | 2497 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 49,255 psi | 71% | 2510 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 49,385 psi | 71% | 2513 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 58,885 psi | 85% | 2552 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 57,464 psi | 83% | 2562 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 39,189 psi | 56% | 2392 fps | 95.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 57,522 psi | 83% | 2513 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,907 psi | 70% | 2503 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 51,213 psi | 74% | 2490 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 55,637 psi | 80% | 2530 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 49,676 psi | 71% | 2484 fps | 100% |
| Vihtavuori 24N41 | <<locked>> | 98% | 51,837 psi | 74% | 2605 fps | 95.2% |
| Vihtavuori N160 | <<locked>> | 80% | 59,103 psi | 85% | 2562 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 43,540 psi | 63% | 2382 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 39,682 psi | 57% | 2346 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 58,102 psi | 83% | 2569 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 49,327 psi | 71% | 2480 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,153 psi | 69% | 2556 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 80% | 40,263 psi | 58% | 2405 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 80% | 35,288 psi | 51% | 2349 fps | 97% |
| Vihtavuori N570 | 87.9 gr | 82% | 35,969 psi | 52% | 2395 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 58,218 psi | 84% | 2516 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,279 psi | 62% | 2487 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,730 psi | 66% | 2428 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 76 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 300gr | Berger Elite Hunter. ADI AR 2218 delivers the highest muzzle velocity at 2,818 fps; across all powders the maximum-charge window runs from 1,617 fps to 2,818 fps. Accurate 8700 gives the best case fill at 100 %, and 76 of the 76 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 1:11.0 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, ReloadSwiss RS 76 rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 300gr | Berger Elite Hunter they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon 50BMG, Vihtavuori 20N29 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.