Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 276gr | Peregrine VLR-5 bullet and 79 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Ramshot Grand.
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>> | 92% | 61,061 psi | 88% | 2720 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 61,989 psi | 89% | 2733 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 61,192 psi | 88% | 2854 fps | 100% |
| ADI APS 450 | <<locked>> | 82% | 61,279 psi | 88% | 2087 fps | 100% |
| ADI AR 2209 | <<locked>> | 88% | 59,103 psi | 85% | 2762 fps | 100% |
| ADI AR 2213 | <<locked>> | 92% | 61,293 psi | 88% | 2835 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 59,364 psi | 85% | 2808 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,517 psi | 74% | 2818 fps | 98.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,693 psi | 77% | 2779 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 59,277 psi | 85% | 2736 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 62,366 psi | 90% | 2802 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 92% | 61,337 psi | 88% | 2825 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 59,205 psi | 85% | 2723 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 59,408 psi | 85% | 2799 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 60,234 psi | 87% | 2818 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,811 psi | 82% | 2861 fps | 99.4% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 47,674 psi | 68% | 2717 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 61,569 psi | 88% | 2802 fps | 99.7% |
| Bofors RP15 | <<locked>> | 94% | 60,437 psi | 87% | 2812 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 58,827 psi | 85% | 2822 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 61,337 psi | 88% | 2825 fps | 100% |
| Bofors RP7 | <<locked>> | 84% | 62,932 psi | 90% | 2733 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 61,119 psi | 88% | 2828 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 60,234 psi | 87% | 2733 fps | 100% |
| Hodgdon H4831 | <<locked>> | 94% | 59,872 psi | 86% | 2762 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 90% | 59,292 psi | 85% | 2756 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 59,393 psi | 85% | 2657 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 62,729 psi | 90% | 2943 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 60,524 psi | 87% | 2785 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,608 psi | 54% | 1677 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 61,873 psi | 89% | 2694 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 61,380 psi | 88% | 2726 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 60,466 psi | 87% | 2700 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 59,654 psi | 86% | 2694 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 60,698 psi | 87% | 2743 fps | 100% |
| IMR 7828 SSC | <<locked>> | 90% | 59,640 psi | 86% | 2822 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 98% | 62,961 psi | 90% | 2749 fps | 97.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,965 psi | 70% | 2707 fps | 99.9% |
| Lovex D100ᴾ | <<locked>> | 100% | 59,117 psi | 85% | 2746 fps | 96.1% |
| Lovex S065 | <<locked>> | 84% | 61,409 psi | 88% | 2694 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 59,741 psi | 86% | 2700 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 62,497 psi | 90% | 2733 fps | 100% |
| Norma 204 | <<locked>> | 84% | 59,132 psi | 85% | 2743 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 49,835 psi | 72% | 2726 fps | 100% |
| Norma MRP | <<locked>> | 90% | 61,786 psi | 89% | 2841 fps | 100% |
| Norma URP | <<locked>> | 84% | 59,843 psi | 86% | 2717 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 59,973 psi | 86% | 2828 fps | 100% |
| Ramshot Hunter | <<locked>> | 86% | 62,946 psi | 90% | 2782 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 61,206 psi | 88% | 2795 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,580 psi | 55% | 1716 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 62,337 psi | 90% | 2759 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 61,003 psi | 88% | 2792 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 59,219 psi | 85% | 2881 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 58,363 psi | 84% | 2861 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 59,654 psi | 86% | 2733 fps | 100% |
| Rottweil R 905 | <<locked>> | 90% | 62,149 psi | 89% | 2792 fps | 100% |
| Rottweil R 907 | <<locked>> | 84% | 62,932 psi | 90% | 2733 fps | 100% |
| Shooters World 50 BMGᴾ | <<locked>> | 100% | 59,117 psi | 85% | 2746 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 84% | 61,409 psi | 88% | 2694 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 59,741 psi | 86% | 2700 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 60,568 psi | 87% | 2657 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 61,714 psi | 89% | 2789 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 61,148 psi | 88% | 2726 fps | 100% |
| Somchem S365 | <<locked>> | 86% | 61,366 psi | 88% | 2713 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 62,366 psi | 90% | 2759 fps | 100% |
| Unknown powder | <<locked>> | 82% | 59,814 psi | 86% | 2717 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 62,526 psi | 90% | 2641 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 60,249 psi | 87% | 2684 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 60,162 psi | 86% | 2720 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 54,650 psi | 79% | 2700 fps | 97.8% |
| Vihtavuori N550 | <<locked>> | 82% | 60,785 psi | 87% | 2730 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 61,148 psi | 88% | 2746 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 61,815 psi | 89% | 2864 fps | 100% |
| Vihtavuori N565 | <<locked>> | 96% | 61,409 psi | 88% | 2838 fps | 100% |
| Vihtavuori N568 | <<locked>> | 98% | 58,914 psi | 85% | 2858 fps | 100% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 60,901 psi | 87% | 2927 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 61,235 psi | 88% | 2657 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 59,161 psi | 85% | 2815 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 59,828 psi | 86% | 2730 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% | 40,683 psi | 58% | 2428 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 54,070 psi | 78% | 2635 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 39,943 psi | 57% | 2510 fps | 97.1% |
| ADI APS 450 | <<locked>> | 80% | 59,379 psi | 85% | 2064 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 45,194 psi | 65% | 2556 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 40,379 psi | 58% | 2507 fps | 98.7% |
| ADI AR 2217 | <<locked>> | 80% | 29,863 psi | 43% | 2267 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 94% | 41,365 psi | 59% | 2618 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 27,137 psi | 39% | 2241 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,112 psi | 75% | 2644 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,049 psi | 65% | 2549 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,973 psi | 59% | 2510 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,682 psi | 57% | 2448 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,243 psi | 49% | 2402 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,570 psi | 64% | 2605 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 38,827 psi | 56% | 2549 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 96% | 40,944 psi | 59% | 2592 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 39,436 psi | 57% | 2431 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 38,058 psi | 55% | 2451 fps | 99% |
| Bofors RP30 | <<locked>> | 80% | 31,604 psi | 45% | 2336 fps | 96.7% |
| Bofors RP5 | <<locked>> | 80% | 40,973 psi | 59% | 2510 fps | 99.5% |
| Bofors RP7 | <<locked>> | 80% | 55,492 psi | 80% | 2638 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 30,647 psi | 44% | 2290 fps | 96.6% |
| Hodgdon H4350 | <<locked>> | 80% | 53,142 psi | 76% | 2638 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 37,913 psi | 54% | 2405 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,235 psi | 61% | 2490 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,733 psi | 70% | 2523 fps | 100% |
| Hodgdon Retumbo | 81.8 gr | 80% | 33,330 psi | 48% | 2441 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 80% | 56,362 psi | 81% | 2733 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 40% | 1496 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 58,334 psi | 84% | 2651 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,908 psi | 73% | 2585 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 80% | 56,840 psi | 82% | 2654 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 46,543 psi | 67% | 2516 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,251 psi | 64% | 2493 fps | 99% |
| IMR 7828 SSC | <<locked>> | 80% | 41,640 psi | 60% | 2539 fps | 99% |
| IMR 7977 Enduron | <<locked>> | 92% | 51,967 psi | 75% | 2595 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 86% | 30,240 psi | 43% | 2326 fps | 95.9% |
| Lovex D100 | <<locked>> | 98% | 54,926 psi | 79% | 2687 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 54,273 psi | 78% | 2605 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,707 psi | 76% | 2608 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,027 psi | 50% | 2320 fps | 99.8% |
| Norma 204 | <<locked>> | 80% | 51,648 psi | 74% | 2638 fps | 100% |
| Norma 217 | <<locked>> | 80% | 24,685 psi | 35% | 2182 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 43,294 psi | 62% | 2572 fps | 100% |
| Norma URP | <<locked>> | 80% | 52,605 psi | 76% | 2621 fps | 100% |
| Ramshot Grand | 87.6 gr | 80% | 43,859 psi | 63% | 2592 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 80% | 51,619 psi | 74% | 2635 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 38,363 psi | 55% | 2461 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,935 psi | 42% | 1532 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 54,302 psi | 78% | 2661 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,895 psi | 76% | 2690 fps | 100% |
| ReloadSwiss RS 76 | 87.6 gr | 80% | 32,372 psi | 47% | 2415 fps | 99.4% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 31,531 psi | 45% | 2372 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 46,151 psi | 66% | 2530 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 80% | 44,556 psi | 64% | 2536 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 80% | 55,492 psi | 80% | 2638 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 98% | 54,926 psi | 79% | 2687 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,273 psi | 78% | 2605 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,707 psi | 76% | 2608 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,171 psi | 76% | 2562 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,222 psi | 64% | 2536 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 46,818 psi | 67% | 2520 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 50,314 psi | 72% | 2579 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,889 psi | 64% | 2513 fps | 100% |
| Unknown powder | <<locked>> | 80% | 56,115 psi | 81% | 2671 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 51,996 psi | 75% | 2513 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 56,333 psi | 81% | 2635 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,000 psi | 55% | 2382 fps | 99.3% |
| Vihtavuori N170 | <<locked>> | 94% | 45,078 psi | 65% | 2543 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 56,913 psi | 82% | 2680 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,092 psi | 63% | 2513 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,133 psi | 59% | 2536 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 80% | 35,476 psi | 51% | 2405 fps | 97.3% |
| Vihtavuori N568 | <<locked>> | 82% | 33,025 psi | 47% | 2392 fps | 95% |
| Vihtavuori N570 | <<locked>> | 88% | 39,175 psi | 56% | 2559 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,374 psi | 77% | 2566 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,362 psi | 54% | 2507 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,962 psi | 65% | 2520 fps | 99.8% |
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 79 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 276gr | Peregrine VLR-5. Hodgdon Retumbo delivers the highest muzzle velocity at 2,943 fps; across all powders the maximum-charge window runs from 1,677 fps to 2,943 fps. ADI AR 2217 gives the best case fill at 100 %, and 79 of the 79 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 276.0 gr projectile in 0.338" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, 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, ReloadSwiss RS 76, Ramshot Grand rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 276gr | Peregrine VLR-5 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.