Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 300gr | CutEdge LZR bullet and 82 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 Vihtavuori N570.
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% | 61,844 psi | 89% | 2605 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 62,787 psi | 90% | 2618 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 40,988 psi | 59% | 2441 fps | 96.3% |
| Accurate MAGPRO | <<locked>> | 92% | 61,989 psi | 89% | 2743 fps | 100% |
| ADI APS 450 | <<locked>> | 82% | 61,467 psi | 88% | 1985 fps | 100% |
| ADI AR 2209 | <<locked>> | 88% | 59,814 psi | 86% | 2648 fps | 100% |
| ADI AR 2213 | <<locked>> | 92% | 62,221 psi | 89% | 2723 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 60,263 psi | 87% | 2697 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,257 psi | 75% | 2720 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,549 psi | 78% | 2671 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 59,959 psi | 86% | 2648 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 60,234 psi | 87% | 2621 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 59,277 psi | 85% | 2641 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 92% | 62,250 psi | 89% | 2710 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 60,017 psi | 86% | 2608 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 60,191 psi | 86% | 2687 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 61,221 psi | 88% | 2707 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,725 psi | 83% | 2756 fps | 99.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 48,660 psi | 70% | 2628 fps | 98.4% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 62,294 psi | 89% | 2690 fps | 99.9% |
| Bofors RP15 | <<locked>> | 94% | 61,337 psi | 88% | 2700 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 59,654 psi | 86% | 2710 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 62,250 psi | 89% | 2710 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 59,785 psi | 86% | 2572 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 62,091 psi | 89% | 2717 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 60,974 psi | 88% | 2618 fps | 100% |
| Hodgdon H4831 | <<locked>> | 94% | 60,756 psi | 87% | 2654 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 90% | 60,133 psi | 86% | 2648 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 60,075 psi | 86% | 2543 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 59,350 psi | 85% | 2779 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 61,409 psi | 88% | 2674 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,681 psi | 54% | 1591 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 62,540 psi | 90% | 2579 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 62,207 psi | 89% | 2612 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 61,192 psi | 88% | 2585 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 60,597 psi | 87% | 2582 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 61,322 psi | 88% | 2631 fps | 100% |
| IMR 7828 SSC | <<locked>> | 90% | 60,539 psi | 87% | 2710 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 96% | 59,785 psi | 86% | 2595 fps | 97.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,937 psi | 72% | 2608 fps | 100% |
| Lovex D100ᴾ | <<locked>> | 100% | 59,770 psi | 86% | 2644 fps | 96.8% |
| Lovex S065 | <<locked>> | 84% | 62,105 psi | 89% | 2579 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 60,524 psi | 87% | 2589 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 59,524 psi | 86% | 2579 fps | 100% |
| Norma 204 | <<locked>> | 84% | 59,915 psi | 86% | 2631 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 50,749 psi | 73% | 2621 fps | 100% |
| Norma MRP | <<locked>> | 90% | 62,656 psi | 90% | 2726 fps | 100% |
| Norma URP | <<locked>> | 84% | 60,655 psi | 87% | 2602 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 60,771 psi | 87% | 2717 fps | 100% |
| Ramshot Hunter | <<locked>> | 84% | 59,741 psi | 86% | 2621 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 62,149 psi | 89% | 2684 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,580 psi | 55% | 1627 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 59,074 psi | 85% | 2598 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 61,989 psi | 89% | 2677 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 60,379 psi | 87% | 2772 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 59,277 psi | 85% | 2753 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 60,423 psi | 87% | 2621 fps | 100% |
| Rottweil R 905 | <<locked>> | 90% | 62,859 psi | 90% | 2677 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 59,785 psi | 86% | 2572 fps | 100% |
| Shooters World 50 BMGᴾ | <<locked>> | 100% | 59,770 psi | 86% | 2644 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 62,105 psi | 89% | 2579 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 60,524 psi | 87% | 2589 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 42,989 psi | 62% | 2454 fps | 96.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 61,235 psi | 88% | 2546 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 62,453 psi | 90% | 2674 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 61,815 psi | 89% | 2618 fps | 100% |
| Somchem S365 | <<locked>> | 86% | 62,323 psi | 90% | 2598 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 59,176 psi | 85% | 2598 fps | 100% |
| Unknown powder | <<locked>> | 82% | 60,756 psi | 87% | 2602 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 59,466 psi | 85% | 2484 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 60,916 psi | 88% | 2569 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 60,988 psi | 88% | 2608 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 55,405 psi | 80% | 2598 fps | 98.4% |
| Vihtavuori N550 | <<locked>> | 82% | 61,496 psi | 88% | 2615 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 61,975 psi | 89% | 2631 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 62,845 psi | 90% | 2753 fps | 100% |
| Vihtavuori N565 | <<locked>> | 96% | 62,294 psi | 89% | 2726 fps | 100% |
| Vihtavuori N568 | <<locked>> | 98% | 59,872 psi | 86% | 2749 fps | 100% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 61,699 psi | 89% | 2818 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 61,960 psi | 89% | 2546 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 60,031 psi | 86% | 2700 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 60,640 psi | 87% | 2618 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% | 41,307 psi | 59% | 2333 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 54,824 psi | 79% | 2526 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 38,174 psi | 55% | 2385 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 80% | 40,669 psi | 58% | 2418 fps | 98% |
| ADI APS 450 | <<locked>> | 80% | 59,466 psi | 85% | 1962 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 45,818 psi | 66% | 2454 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 41,060 psi | 59% | 2415 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 80% | 30,371 psi | 44% | 2188 fps | 96.7% |
| ADI AR 2218 | <<locked>> | 90% | 36,390 psi | 52% | 2405 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 27,688 psi | 40% | 2169 fps | 98.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,079 psi | 66% | 2451 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,823 psi | 76% | 2530 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,643 psi | 66% | 2448 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,640 psi | 60% | 2415 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,495 psi | 58% | 2349 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,795 psi | 50% | 2310 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,353 psi | 65% | 2503 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 36,753 psi | 53% | 2405 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 94% | 38,711 psi | 56% | 2448 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 39,900 psi | 57% | 2339 fps | 96.6% |
| Bofors RP15 | <<locked>> | 80% | 38,740 psi | 56% | 2359 fps | 99.5% |
| Bofors RP30 | <<locked>> | 80% | 32,184 psi | 46% | 2254 fps | 97.7% |
| Bofors RP5 | <<locked>> | 80% | 41,640 psi | 60% | 2415 fps | 99.8% |
| Bofors RP7 | <<locked>> | 80% | 56,144 psi | 81% | 2526 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 31,198 psi | 45% | 2211 fps | 97.6% |
| Hodgdon H4350 | <<locked>> | 80% | 53,969 psi | 78% | 2530 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 38,595 psi | 55% | 2316 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,888 psi | 62% | 2395 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,545 psi | 71% | 2418 fps | 100% |
| Hodgdon Retumbo | 77.8 gr | 80% | 34,055 psi | 49% | 2359 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 80% | 57,000 psi | 82% | 2621 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,297 psi | 41% | 1421 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 58,987 psi | 85% | 2536 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,503 psi | 74% | 2477 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 80% | 57,537 psi | 83% | 2543 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,224 psi | 68% | 2411 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,759 psi | 64% | 2395 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 80% | 42,337 psi | 61% | 2444 fps | 99.5% |
| IMR 7977 Enduron | <<locked>> | 90% | 49,385 psi | 71% | 2448 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 82% | 26,963 psi | 39% | 2146 fps | 95.1% |
| Lovex D100 | <<locked>> | 96% | 51,808 psi | 74% | 2536 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 55,071 psi | 79% | 2493 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 53,447 psi | 77% | 2500 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,563 psi | 51% | 2231 fps | 100% |
| Norma 204 | <<locked>> | 80% | 52,359 psi | 75% | 2533 fps | 100% |
| Norma 217 | <<locked>> | 80% | 25,208 psi | 36% | 2113 fps | 96.7% |
| Norma MRP | <<locked>> | 80% | 44,106 psi | 63% | 2477 fps | 100% |
| Norma URP | <<locked>> | 80% | 53,403 psi | 77% | 2513 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,643 psi | 64% | 2497 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 80% | 52,344 psi | 75% | 2526 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 38,957 psi | 56% | 2365 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,022 psi | 42% | 1453 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 55,042 psi | 79% | 2549 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,795 psi | 77% | 2582 fps | 100% |
| ReloadSwiss RS 76 | 83.2 gr | 80% | 32,924 psi | 47% | 2333 fps | 99.8% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 29,820 psi | 43% | 2234 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 46,644 psi | 67% | 2428 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 45,339 psi | 65% | 2441 fps | 100% |
| Rottweil R 907 | <<locked>> | 80% | 56,144 psi | 81% | 2526 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 96% | 51,808 psi | 74% | 2536 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 55,071 psi | 79% | 2493 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 53,447 psi | 77% | 2500 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 40,030 psi | 57% | 2402 fps | 95.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,751 psi | 77% | 2454 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,005 psi | 65% | 2438 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 47,471 psi | 68% | 2425 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 51,039 psi | 73% | 2467 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,585 psi | 65% | 2415 fps | 100% |
| Unknown powder | <<locked>> | 80% | 56,797 psi | 82% | 2556 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 52,721 psi | 76% | 2405 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 57,000 psi | 82% | 2523 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,609 psi | 55% | 2290 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 92% | 42,946 psi | 62% | 2402 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 57,580 psi | 83% | 2569 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,788 psi | 64% | 2411 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,756 psi | 60% | 2441 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 80% | 36,100 psi | 52% | 2316 fps | 98.1% |
| Vihtavuori N568 | <<locked>> | 80% | 31,299 psi | 45% | 2254 fps | 95.1% |
| Vihtavuori N570 | 87.7 gr | 86% | 37,173 psi | 53% | 2418 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 54,012 psi | 78% | 2457 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,261 psi | 55% | 2411 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,614 psi | 66% | 2418 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 82 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 300gr | CutEdge LZR. Vihtavuori N570 delivers the highest muzzle velocity at 2,818 fps; across all powders the maximum-charge window runs from 1,591 fps to 2,818 fps. Accurate 8700 gives the best case fill at 100 %, and 82 of the 82 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 1:8.5 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, ReloadSwiss RS 76, Vihtavuori N570 rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 300gr | CutEdge LZR 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.