Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 300gr | Berger Hybrid Target 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% | 59,654 psi | 86% | 2592 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 46,267 psi | 66% | 2546 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 88% | 59,727 psi | 86% | 2730 fps | 100% |
| ADI APS 450 | <<locked>> | 82% | 61,540 psi | 88% | 2018 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 60,901 psi | 87% | 2674 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 59,408 psi | 85% | 2700 fps | 100% |
| ADI AR 2217 | <<locked>> | 98% | 62,424 psi | 90% | 2736 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 58,436 psi | 84% | 2828 fps | 100% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 61,221 psi | 88% | 2753 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 61,192 psi | 88% | 2641 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 60,350 psi | 87% | 2667 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 59,799 psi | 86% | 2694 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 61,859 psi | 89% | 2638 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 62,337 psi | 90% | 2717 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 58,871 psi | 85% | 2687 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 60,249 psi | 87% | 2799 fps | 99.9% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,593 psi | 80% | 2740 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 59,306 psi | 85% | 2671 fps | 99.9% |
| Bofors RP15 | <<locked>> | 92% | 62,903 psi | 90% | 2730 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 62,047 psi | 89% | 2749 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 59,799 psi | 86% | 2694 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 59,901 psi | 86% | 2700 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 61,714 psi | 89% | 2644 fps | 100% |
| Hodgdon H4831 | <<locked>> | 92% | 62,004 psi | 89% | 2684 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 88% | 61,032 psi | 88% | 2674 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 61,235 psi | 88% | 2566 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 61,888 psi | 89% | 2812 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,927 psi | 54% | 1617 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 62,772 psi | 90% | 2635 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 61,786 psi | 89% | 2608 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 62,018 psi | 89% | 2657 fps | 100% |
| IMR 7828 SSC | <<locked>> | 88% | 61,946 psi | 89% | 2740 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 94% | 60,640 psi | 87% | 2628 fps | 98.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,101 psi | 81% | 2697 fps | 100% |
| Lovex D100 | <<locked>> | 98% | 61,467 psi | 88% | 2687 fps | 97.6% |
| Lovex S065 | <<locked>> | 82% | 62,816 psi | 90% | 2602 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 61,366 psi | 88% | 2612 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 61,351 psi | 88% | 2612 fps | 100% |
| Norma 204 | <<locked>> | 82% | 60,597 psi | 87% | 2654 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,348 psi | 82% | 2710 fps | 100% |
| Norma MRP | <<locked>> | 86% | 60,075 psi | 86% | 2707 fps | 100% |
| Norma URP | <<locked>> | 82% | 61,641 psi | 89% | 2625 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 62,555 psi | 90% | 2746 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 60,655 psi | 87% | 2644 fps | 100% |
| Ramshot LRTᴾ | <<locked>> | 100% | 57,783 psi | 83% | 2756 fps | 97% |
| Ramshot Magnum | <<locked>> | 88% | 59,205 psi | 85% | 2664 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,001 psi | 56% | 1657 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 58,552 psi | 84% | 2756 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 61,888 psi | 89% | 2795 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 61,134 psi | 88% | 2644 fps | 100% |
| Rottweil R 905 | <<locked>> | 86% | 60,278 psi | 87% | 2661 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 98% | 61,467 psi | 88% | 2687 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 62,816 psi | 90% | 2602 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 61,366 psi | 88% | 2612 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 48,515 psi | 70% | 2556 fps | 98.2% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 61,627 psi | 89% | 2566 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 59,886 psi | 86% | 2657 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 62,700 psi | 90% | 2644 fps | 100% |
| Somchem S365 | <<locked>> | 82% | 59,799 psi | 86% | 2582 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 60,350 psi | 87% | 2625 fps | 100% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 46,354 psi | 67% | 2546 fps | 96.2% |
| Vihtavuori 24N41ᴾ | <<locked>> | 100% | 58,595 psi | 84% | 2717 fps | 96.8% |
| Vihtavuori N150 | <<locked>> | 82% | 60,104 psi | 86% | 2503 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 62,250 psi | 89% | 2638 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 60,930 psi | 88% | 2687 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 86% | 59,901 psi | 86% | 2618 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 60,292 psi | 87% | 2733 fps | 100% |
| Vihtavuori N565 | <<locked>> | 92% | 60,321 psi | 87% | 2713 fps | 100% |
| Vihtavuori N568 | <<locked>> | 96% | 62,163 psi | 89% | 2789 fps | 100% |
| Vihtavuori N570 | <<locked>> | 96% | 60,031 psi | 86% | 2805 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 62,656 psi | 90% | 2566 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 88% | 58,653 psi | 84% | 2687 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 61,656 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% | 45,992 psi | 66% | 2411 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 37,405 psi | 54% | 2379 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 80% | 45,310 psi | 65% | 2510 fps | 99.1% |
| ADI APS 450 | <<locked>> | 80% | 59,480 psi | 85% | 1991 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 49,995 psi | 72% | 2530 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 45,310 psi | 65% | 2497 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 80% | 33,837 psi | 49% | 2280 fps | 98.3% |
| ADI AR 2218 | <<locked>> | 86% | 35,433 psi | 51% | 2395 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 31,111 psi | 45% | 2264 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 57,450 psi | 83% | 2598 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,879 psi | 72% | 2523 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,064 psi | 66% | 2497 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,889 psi | 64% | 2421 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,986 psi | 56% | 2392 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,995 psi | 73% | 2585 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 36,042 psi | 52% | 2392 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 88% | 35,882 psi | 52% | 2388 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,091 psi | 62% | 2418 fps | 97.9% |
| Bofors RP15 | <<locked>> | 80% | 42,946 psi | 62% | 2444 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 36,492 psi | 52% | 2352 fps | 99% |
| Bofors RP5 | <<locked>> | 80% | 46,064 psi | 66% | 2497 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 34,766 psi | 50% | 2303 fps | 99% |
| Hodgdon H4350 | <<locked>> | 80% | 58,059 psi | 83% | 2598 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 42,221 psi | 61% | 2395 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,934 psi | 67% | 2474 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 54,012 psi | 78% | 2484 fps | 100% |
| Hodgdon Retumbo | 83.1 gr | 80% | 38,116 psi | 55% | 2454 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,601 psi | 41% | 1447 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 55,506 psi | 80% | 2546 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 51,517 psi | 74% | 2480 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,414 psi | 70% | 2470 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 80% | 46,905 psi | 67% | 2530 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 86% | 47,036 psi | 68% | 2428 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 80% | 28,747 psi | 41% | 2195 fps | 96.5% |
| Lovex D100 | <<locked>> | 92% | 49,734 psi | 71% | 2520 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 59,190 psi | 85% | 2559 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 57,769 psi | 83% | 2569 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 39,784 psi | 57% | 2310 fps | 100% |
| Norma 204 | <<locked>> | 80% | 56,797 psi | 82% | 2605 fps | 100% |
| Norma 217 | <<locked>> | 80% | 28,964 psi | 42% | 2218 fps | 98.6% |
| Norma MRP | <<locked>> | 80% | 49,023 psi | 70% | 2559 fps | 100% |
| Norma URP | <<locked>> | 80% | 57,972 psi | 83% | 2579 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 49,864 psi | 72% | 2582 fps | 100% |
| Ramshot Hunter | <<locked>> | 80% | 56,942 psi | 82% | 2598 fps | 100% |
| Ramshot LRT | <<locked>> | 96% | 50,270 psi | 72% | 2638 fps | 95.2% |
| Ramshot Magnum | <<locked>> | 80% | 43,845 psi | 63% | 2454 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,341 psi | 42% | 1480 fps | 100% |
| ReloadSwiss RS 76 | 88.9 gr | 80% | 37,275 psi | 54% | 2431 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 34,272 psi | 49% | 2343 fps | 97.3% |
| Rottweil R 904 | <<locked>> | 80% | 50,633 psi | 73% | 2503 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 49,545 psi | 71% | 2513 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 49,734 psi | 71% | 2520 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 59,190 psi | 85% | 2559 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 57,769 psi | 83% | 2569 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 36,970 psi | 53% | 2346 fps | 95% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 57,783 psi | 83% | 2520 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,211 psi | 71% | 2513 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 51,416 psi | 74% | 2497 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 55,956 psi | 80% | 2536 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 49,951 psi | 72% | 2490 fps | 100% |
| Vihtavuori 20N29 | <<locked>> | 98% | 43,076 psi | 62% | 2487 fps | 95.3% |
| Vihtavuori 24N41 | <<locked>> | 96% | 50,952 psi | 73% | 2605 fps | 95.1% |
| Vihtavuori N150 | <<locked>> | 80% | 56,695 psi | 81% | 2464 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 42,554 psi | 61% | 2369 fps | 100% |
| Vihtavuori N170 | <<locked>> | 86% | 39,291 psi | 56% | 2343 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 49,516 psi | 71% | 2487 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,282 psi | 66% | 2526 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 80% | 40,509 psi | 58% | 2411 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 80% | 35,549 psi | 51% | 2356 fps | 97.2% |
| Vihtavuori N570 | 89.3 gr | 82% | 36,390 psi | 52% | 2402 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 58,494 psi | 84% | 2520 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,801 psi | 63% | 2497 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,995 psi | 72% | 2497 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 73 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 300gr | Berger Hybrid Target. ADI AR 2218 delivers the highest muzzle velocity at 2,828 fps; across all powders the maximum-charge window runs from 1,617 fps to 2,828 fps. Accurate 8700 gives the best case fill at 100 %, and 73 of the 73 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 Hybrid Target 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.