Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 306gr | Peregrine VLR-5 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% | 59,886 psi | 86% | 2562 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 60,452 psi | 87% | 2569 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 42,743 psi | 61% | 2454 fps | 97.2% |
| Accurate MAGPRO | <<locked>> | 90% | 60,089 psi | 86% | 2700 fps | 100% |
| ADI APS 450 | <<locked>> | 82% | 61,409 psi | 88% | 1975 fps | 100% |
| ADI AR 2209 | <<locked>> | 88% | 61,786 psi | 89% | 2651 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 60,191 psi | 86% | 2677 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 62,801 psi | 90% | 2703 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,302 psi | 78% | 2733 fps | 99.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,014 psi | 82% | 2677 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 62,149 psi | 89% | 2618 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 60,930 psi | 88% | 2641 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 60,336 psi | 87% | 2664 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 62,076 psi | 89% | 2608 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 62,569 psi | 90% | 2687 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 59,074 psi | 85% | 2657 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 60,394 psi | 87% | 2769 fps | 99.9% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 50,923 psi | 73% | 2641 fps | 99% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 60,278 psi | 87% | 2648 fps | 99.9% |
| Bofors RP15 | <<locked>> | 92% | 59,466 psi | 85% | 2654 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 62,120 psi | 89% | 2717 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 60,336 psi | 87% | 2664 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 61,409 psi | 88% | 2569 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 60,191 psi | 86% | 2674 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 62,642 psi | 90% | 2618 fps | 100% |
| Hodgdon H4831 | <<locked>> | 94% | 62,627 psi | 90% | 2657 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 90% | 61,989 psi | 89% | 2648 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 61,873 psi | 89% | 2539 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 61,946 psi | 89% | 2782 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,739 psi | 54% | 1581 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 60,104 psi | 86% | 2569 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 62,772 psi | 90% | 2585 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 62,366 psi | 90% | 2579 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 59,335 psi | 85% | 2589 fps | 100% |
| IMR 7828 SSC | <<locked>> | 90% | 62,627 psi | 90% | 2713 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 96% | 61,583 psi | 88% | 2602 fps | 98.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,054 psi | 75% | 2615 fps | 100% |
| Lovex D100ᴾ | <<locked>> | 100% | 62,033 psi | 89% | 2657 fps | 97.6% |
| Lovex S065 | <<locked>> | 82% | 60,002 psi | 86% | 2536 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 62,192 psi | 89% | 2585 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 61,540 psi | 88% | 2582 fps | 100% |
| Norma 204 | <<locked>> | 84% | 61,612 psi | 89% | 2631 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 53,011 psi | 76% | 2628 fps | 100% |
| Norma MRP | <<locked>> | 88% | 60,553 psi | 87% | 2680 fps | 100% |
| Norma URP | <<locked>> | 84% | 62,453 psi | 90% | 2598 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 58,624 psi | 84% | 2667 fps | 100% |
| Ramshot Hunter | <<locked>> | 84% | 61,467 psi | 88% | 2618 fps | 100% |
| Ramshot LRTᴾ | <<locked>> | 100% | 54,056 psi | 78% | 2667 fps | 96% |
| Ramshot Magnum | <<locked>> | 90% | 59,814 psi | 86% | 2638 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,653 psi | 56% | 1621 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 60,858 psi | 87% | 2595 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 59,727 psi | 86% | 2628 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 58,552 psi | 84% | 2726 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 61,801 psi | 89% | 2762 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 62,047 psi | 89% | 2618 fps | 100% |
| Rottweil R 905 | <<locked>> | 88% | 60,916 psi | 88% | 2631 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 61,409 psi | 88% | 2569 fps | 100% |
| Shooters World 50 BMGᴾ | <<locked>> | 100% | 62,033 psi | 89% | 2657 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 60,002 psi | 86% | 2536 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 62,192 psi | 89% | 2585 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 44,889 psi | 64% | 2470 fps | 97.3% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 62,816 psi | 90% | 2543 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 60,495 psi | 87% | 2631 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 59,625 psi | 86% | 2572 fps | 100% |
| Somchem S365 | <<locked>> | 84% | 60,321 psi | 87% | 2556 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 61,017 psi | 88% | 2598 fps | 100% |
| Unknown powder | <<locked>> | 82% | 62,308 psi | 90% | 2598 fps | 100% |
| Vihtavuori 24N41ᴾ | <<locked>> | 100% | 54,926 psi | 79% | 2631 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 84% | 60,959 psi | 88% | 2480 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 62,656 psi | 90% | 2566 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 62,845 psi | 90% | 2612 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 57,435 psi | 83% | 2608 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 88% | 60,031 psi | 86% | 2589 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 60,727 psi | 87% | 2703 fps | 100% |
| Vihtavuori N565 | <<locked>> | 94% | 60,379 psi | 87% | 2684 fps | 100% |
| Vihtavuori N568 | <<locked>> | 98% | 62,352 psi | 90% | 2759 fps | 100% |
| Vihtavuori N570 | <<locked>> | 98% | 59,973 psi | 86% | 2772 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 59,625 psi | 86% | 2500 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 62,888 psi | 90% | 2703 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 62,482 psi | 90% | 2621 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% | 42,859 psi | 62% | 2339 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 56,666 psi | 81% | 2526 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 37,028 psi | 53% | 2346 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 80% | 42,163 psi | 61% | 2428 fps | 98.5% |
| ADI APS 450 | <<locked>> | 80% | 59,437 psi | 85% | 1949 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 47,384 psi | 68% | 2457 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 42,424 psi | 61% | 2418 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 80% | 31,430 psi | 45% | 2198 fps | 97.5% |
| ADI AR 2218 | <<locked>> | 88% | 35,244 psi | 51% | 2365 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 28,703 psi | 41% | 2178 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,476 psi | 78% | 2530 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,195 psi | 68% | 2454 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,062 psi | 62% | 2421 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,945 psi | 60% | 2352 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,245 psi | 52% | 2320 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,340 psi | 68% | 2507 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 35,592 psi | 51% | 2359 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 92% | 37,652 psi | 54% | 2408 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 41,104 psi | 59% | 2349 fps | 97.3% |
| Bofors RP15 | <<locked>> | 80% | 40,089 psi | 58% | 2365 fps | 99.8% |
| Bofors RP30 | <<locked>> | 80% | 33,605 psi | 48% | 2267 fps | 98.3% |
| Bofors RP5 | <<locked>> | 80% | 43,062 psi | 62% | 2421 fps | 100% |
| Bofors RP7 | <<locked>> | 80% | 57,580 psi | 83% | 2523 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 32,300 psi | 46% | 2221 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 80% | 55,419 psi | 80% | 2530 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 39,842 psi | 57% | 2323 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,193 psi | 63% | 2398 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,068 psi | 73% | 2415 fps | 100% |
| Hodgdon Retumbo | 79 gr | 80% | 35,346 psi | 51% | 2369 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,355 psi | 41% | 1414 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,026 psi | 76% | 2480 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 80% | 58,900 psi | 85% | 2539 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 48,689 psi | 70% | 2411 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,122 psi | 66% | 2402 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 80% | 43,947 psi | 63% | 2454 fps | 99.8% |
| IMR 7977 Enduron | <<locked>> | 88% | 47,572 psi | 68% | 2402 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 80% | 26,208 psi | 38% | 2106 fps | 95.1% |
| Lovex D100 | <<locked>> | 94% | 50,024 psi | 72% | 2493 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 56,463 psi | 81% | 2493 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 54,882 psi | 79% | 2497 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,869 psi | 53% | 2234 fps | 100% |
| Norma 204 | <<locked>> | 80% | 53,780 psi | 77% | 2533 fps | 100% |
| Norma 217 | <<locked>> | 80% | 26,281 psi | 38% | 2126 fps | 97.6% |
| Norma MRP | <<locked>> | 80% | 45,745 psi | 66% | 2480 fps | 100% |
| Norma URP | <<locked>> | 80% | 54,926 psi | 79% | 2510 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,601 psi | 67% | 2507 fps | 100% |
| Ramshot Hunter | <<locked>> | 80% | 53,824 psi | 77% | 2526 fps | 100% |
| Ramshot LRT | <<locked>> | 98% | 50,386 psi | 72% | 2608 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 80% | 40,669 psi | 58% | 2375 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,080 psi | 42% | 1447 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 56,811 psi | 82% | 2549 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 55,608 psi | 80% | 2582 fps | 100% |
| ReloadSwiss RS 76 | 84.6 gr | 80% | 34,389 psi | 49% | 2349 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 31,125 psi | 45% | 2247 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 48,124 psi | 69% | 2434 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 80% | 46,760 psi | 67% | 2441 fps | 100% |
| Rottweil R 907 | <<locked>> | 80% | 57,580 psi | 83% | 2523 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 94% | 50,024 psi | 72% | 2493 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 56,463 psi | 81% | 2493 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 54,882 psi | 79% | 2497 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 38,928 psi | 56% | 2362 fps | 95.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 55,288 psi | 79% | 2457 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,412 psi | 67% | 2438 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 48,820 psi | 70% | 2428 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 52,866 psi | 76% | 2470 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,949 psi | 67% | 2415 fps | 100% |
| Unknown powder | <<locked>> | 80% | 58,566 psi | 84% | 2556 fps | 100% |
| Vihtavuori 24N41 | <<locked>> | 98% | 51,068 psi | 73% | 2572 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 53,983 psi | 78% | 2398 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 58,682 psi | 84% | 2523 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,885 psi | 57% | 2293 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 90% | 41,582 psi | 60% | 2359 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 46,354 psi | 67% | 2411 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,323 psi | 62% | 2448 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 80% | 37,521 psi | 54% | 2326 fps | 98.7% |
| Vihtavuori N568 | <<locked>> | 80% | 32,634 psi | 47% | 2267 fps | 96.1% |
| Vihtavuori N570 | 87 gr | 84% | 36,042 psi | 52% | 2372 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 55,767 psi | 80% | 2457 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,045 psi | 58% | 2415 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,268 psi | 68% | 2425 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 83 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 306gr | Peregrine VLR-5. Hodgdon Retumbo delivers the highest muzzle velocity at 2,782 fps; across all powders the maximum-charge window runs from 1,581 fps to 2,782 fps. Accurate 8700 gives the best case fill at 100 %, and 83 of the 83 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 306.0 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 | 306gr | Peregrine VLR-5 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon 50BMG, Hodgdon US 869 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.