Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 300gr | Peregrine VLR-4 bullet and 80 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 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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Max Load - Barrel Length: 27"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 90% | 58,914 psi | 85% | 2579 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 59,538 psi | 86% | 2585 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 41,872 psi | 60% | 2461 fps | 96.7% |
| Accurate MAGPRO | <<locked>> | 90% | 59,045 psi | 85% | 2713 fps | 100% |
| ADI APS 450 | <<locked>> | 82% | 61,366 psi | 88% | 1991 fps | 100% |
| ADI AR 2209 | <<locked>> | 88% | 60,872 psi | 87% | 2667 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 59,190 psi | 85% | 2690 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 61,627 psi | 89% | 2717 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,243 psi | 76% | 2740 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,854 psi | 80% | 2690 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 61,221 psi | 88% | 2635 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 60,031 psi | 86% | 2654 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 59,350 psi | 85% | 2680 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 61,046 psi | 88% | 2625 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 61,424 psi | 88% | 2703 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 62,323 psi | 90% | 2723 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 59,117 psi | 85% | 2779 fps | 99.8% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 49,748 psi | 71% | 2648 fps | 98.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 59,422 psi | 85% | 2661 fps | 99.8% |
| Bofors RP15 | <<locked>> | 94% | 62,265 psi | 89% | 2717 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 60,974 psi | 88% | 2730 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 59,350 psi | 85% | 2680 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 60,640 psi | 87% | 2585 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 59,059 psi | 85% | 2684 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 61,815 psi | 89% | 2635 fps | 100% |
| Hodgdon H4831 | <<locked>> | 94% | 61,685 psi | 89% | 2671 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 90% | 61,061 psi | 88% | 2664 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 60,974 psi | 88% | 2556 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 60,655 psi | 87% | 2795 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 62,410 psi | 90% | 2687 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,695 psi | 54% | 1598 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 59,321 psi | 85% | 2585 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 62,018 psi | 89% | 2602 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 61,482 psi | 88% | 2595 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 62,207 psi | 89% | 2648 fps | 100% |
| IMR 7828 SSC | <<locked>> | 90% | 61,554 psi | 88% | 2726 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 96% | 60,727 psi | 87% | 2615 fps | 97.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,995 psi | 73% | 2625 fps | 100% |
| Lovex D100ᴾ | <<locked>> | 100% | 60,974 psi | 88% | 2667 fps | 97.2% |
| Lovex S065 | <<locked>> | 84% | 62,932 psi | 90% | 2595 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 61,380 psi | 88% | 2602 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 60,553 psi | 87% | 2595 fps | 100% |
| Norma 204 | <<locked>> | 84% | 60,742 psi | 87% | 2644 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 51,866 psi | 75% | 2641 fps | 100% |
| Norma MRP | <<locked>> | 88% | 59,509 psi | 85% | 2694 fps | 100% |
| Norma URP | <<locked>> | 84% | 61,583 psi | 88% | 2615 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 62,018 psi | 89% | 2733 fps | 100% |
| Ramshot Hunter | <<locked>> | 84% | 60,568 psi | 87% | 2635 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 58,682 psi | 84% | 2651 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,595 psi | 55% | 1634 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 59,930 psi | 86% | 2612 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 58,740 psi | 84% | 2644 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 61,815 psi | 89% | 2789 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 60,510 psi | 87% | 2772 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 61,192 psi | 88% | 2635 fps | 100% |
| Rottweil R 905 | <<locked>> | 88% | 59,973 psi | 86% | 2648 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 60,640 psi | 87% | 2585 fps | 100% |
| Shooters World 50 BMGᴾ | <<locked>> | 100% | 60,974 psi | 88% | 2667 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 84% | 62,932 psi | 90% | 2595 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 61,380 psi | 88% | 2602 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 43,976 psi | 63% | 2477 fps | 96.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 62,004 psi | 89% | 2559 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 59,567 psi | 86% | 2644 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 62,787 psi | 90% | 2635 fps | 100% |
| Somchem S365 | <<locked>> | 84% | 59,379 psi | 85% | 2572 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 60,104 psi | 86% | 2615 fps | 100% |
| Unknown powder | <<locked>> | 82% | 61,453 psi | 88% | 2615 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 60,191 psi | 86% | 2497 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 61,786 psi | 89% | 2582 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 61,888 psi | 89% | 2625 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 56,492 psi | 81% | 2618 fps | 98.6% |
| Vihtavuori N550 | <<locked>> | 82% | 62,366 psi | 90% | 2628 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 59,059 psi | 85% | 2602 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 59,712 psi | 86% | 2717 fps | 100% |
| Vihtavuori N565 | <<locked>> | 94% | 59,321 psi | 85% | 2697 fps | 100% |
| Vihtavuori N568 | <<locked>> | 98% | 61,148 psi | 88% | 2769 fps | 100% |
| Vihtavuori N570 | <<locked>> | 98% | 58,740 psi | 84% | 2782 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 62,874 psi | 90% | 2559 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 61,511 psi | 88% | 2720 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 61,525 psi | 88% | 2635 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% | 42,119 psi | 61% | 2349 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 55,796 psi | 80% | 2539 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 38,885 psi | 56% | 2402 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 80% | 41,394 psi | 59% | 2438 fps | 98.2% |
| ADI APS 450 | <<locked>> | 80% | 59,408 psi | 85% | 1969 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 46,644 psi | 67% | 2474 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 41,698 psi | 60% | 2428 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 80% | 30,893 psi | 44% | 2205 fps | 97% |
| ADI AR 2218 | <<locked>> | 90% | 37,130 psi | 53% | 2428 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 28,166 psi | 40% | 2185 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,635 psi | 77% | 2546 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,470 psi | 67% | 2464 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,322 psi | 61% | 2431 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,205 psi | 59% | 2365 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,549 psi | 51% | 2326 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,398 psi | 67% | 2520 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 34,838 psi | 50% | 2365 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 92% | 36,753 psi | 53% | 2411 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 40,553 psi | 58% | 2359 fps | 96.9% |
| Bofors RP15 | <<locked>> | 80% | 39,392 psi | 57% | 2375 fps | 99.6% |
| Bofors RP30 | <<locked>> | 80% | 32,924 psi | 47% | 2274 fps | 98% |
| Bofors RP5 | <<locked>> | 80% | 42,322 psi | 61% | 2431 fps | 99.9% |
| Bofors RP7 | <<locked>> | 80% | 56,855 psi | 82% | 2539 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 31,734 psi | 46% | 2228 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 80% | 54,679 psi | 79% | 2543 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 39,204 psi | 56% | 2333 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,497 psi | 62% | 2408 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,299 psi | 72% | 2431 fps | 100% |
| Hodgdon Retumbo | 79 gr | 80% | 34,664 psi | 50% | 2375 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 80% | 58,001 psi | 83% | 2638 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,311 psi | 41% | 1427 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,301 psi | 75% | 2493 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 80% | 58,189 psi | 84% | 2556 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,964 psi | 69% | 2428 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,484 psi | 65% | 2411 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 80% | 43,149 psi | 62% | 2464 fps | 99.6% |
| IMR 7977 Enduron | <<locked>> | 88% | 46,905 psi | 67% | 2411 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 82% | 27,485 psi | 39% | 2162 fps | 95.5% |
| Lovex D100 | <<locked>> | 96% | 52,779 psi | 76% | 2556 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 55,738 psi | 80% | 2507 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 54,143 psi | 78% | 2513 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,230 psi | 52% | 2244 fps | 100% |
| Norma 204 | <<locked>> | 80% | 52,982 psi | 76% | 2546 fps | 100% |
| Norma 217 | <<locked>> | 80% | 25,715 psi | 37% | 2129 fps | 97% |
| Norma MRP | <<locked>> | 80% | 44,918 psi | 65% | 2493 fps | 100% |
| Norma URP | <<locked>> | 80% | 54,128 psi | 78% | 2526 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,658 psi | 66% | 2513 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 80% | 53,026 psi | 76% | 2539 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 39,842 psi | 57% | 2385 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,022 psi | 42% | 1460 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 55,927 psi | 80% | 2566 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 54,679 psi | 79% | 2595 fps | 100% |
| ReloadSwiss RS 76 | 84.6 gr | 80% | 33,692 psi | 48% | 2352 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 30,443 psi | 44% | 2254 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 47,442 psi | 68% | 2444 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 80% | 46,006 psi | 66% | 2454 fps | 100% |
| Rottweil R 907 | <<locked>> | 80% | 56,855 psi | 82% | 2539 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 96% | 52,779 psi | 76% | 2556 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 55,738 psi | 80% | 2507 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 54,143 psi | 78% | 2513 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 38,116 psi | 55% | 2365 fps | 95% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 54,578 psi | 78% | 2470 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,672 psi | 66% | 2451 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 48,124 psi | 69% | 2438 fps | 99.7% |
| Somchem S365 | <<locked>> | 80% | 51,996 psi | 75% | 2484 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,224 psi | 66% | 2428 fps | 100% |
| Unknown powder | <<locked>> | 80% | 57,740 psi | 83% | 2572 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 53,287 psi | 77% | 2415 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 57,856 psi | 83% | 2539 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,233 psi | 56% | 2303 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 90% | 40,886 psi | 59% | 2365 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 58,479 psi | 84% | 2582 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 45,571 psi | 65% | 2428 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,569 psi | 61% | 2457 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 80% | 36,811 psi | 53% | 2336 fps | 98.3% |
| Vihtavuori N568 | <<locked>> | 80% | 31,952 psi | 46% | 2274 fps | 95.5% |
| Vihtavuori N570 | 89.1 gr | 86% | 37,985 psi | 55% | 2438 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 54,955 psi | 79% | 2474 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,088 psi | 56% | 2425 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,514 psi | 67% | 2438 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 85 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 300gr | Peregrine VLR-4. Hodgdon Retumbo delivers the highest muzzle velocity at 2,795 fps; across all powders the maximum-charge window runs from 1,598 fps to 2,795 fps. Accurate 8700 gives the best case fill at 100 %, and 85 of the 85 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 1:9.0 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, Vihtavuori N570, ReloadSwiss RS 76 rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 300gr | Peregrine VLR-4 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon 50BMG, Hodgdon US 869, 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.