Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 267gr | CutEdge MTAC bullet and 81 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 N560.
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 2700 | <<locked>> | 82% | 62,613 psi | 90% | 2730 fps | 100% |
| Accurate 3100 | <<locked>> | 92% | 60,089 psi | 86% | 2753 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 61,017 psi | 88% | 2769 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 60,046 psi | 86% | 2884 fps | 99.8% |
| ADI APS 450 | <<locked>> | 82% | 61,250 psi | 88% | 2123 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 62,033 psi | 89% | 2844 fps | 100% |
| ADI AR 2213 | <<locked>> | 92% | 60,249 psi | 87% | 2867 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 58,363 psi | 84% | 2841 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 50,502 psi | 73% | 2838 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,489 psi | 75% | 2805 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 62,076 psi | 89% | 2841 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 62,076 psi | 89% | 2841 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 62,265 psi | 89% | 2818 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 61,308 psi | 88% | 2835 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 92% | 60,365 psi | 87% | 2858 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 94% | 61,960 psi | 89% | 2802 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 62,236 psi | 89% | 2877 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 58,885 psi | 85% | 2851 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,564 psi | 80% | 2884 fps | 99.1% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 46,688 psi | 67% | 2740 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 60,785 psi | 87% | 2831 fps | 99.5% |
| Bofors RP15 | <<locked>> | 94% | 59,451 psi | 85% | 2844 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 61,772 psi | 89% | 2904 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 60,365 psi | 87% | 2858 fps | 100% |
| Bofors RP7 | <<locked>> | 84% | 62,149 psi | 89% | 2766 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 60,089 psi | 86% | 2858 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 59,466 psi | 85% | 2769 fps | 100% |
| Hodgdon H4831 | <<locked>> | 96% | 62,961 psi | 90% | 2848 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 92% | 62,366 psi | 90% | 2841 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 62,207 psi | 89% | 2736 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 61,337 psi | 88% | 2976 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 59,611 psi | 86% | 2818 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,521 psi | 54% | 1703 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 61,032 psi | 88% | 2730 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 60,510 psi | 87% | 2759 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 59,741 psi | 86% | 2736 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 62,569 psi | 90% | 2772 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 59,785 psi | 86% | 2776 fps | 100% |
| IMR 7828 SSC | <<locked>> | 92% | 62,671 psi | 90% | 2907 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 98% | 62,062 psi | 89% | 2779 fps | 97.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,037 psi | 69% | 2733 fps | 99.8% |
| Lovex S065 | <<locked>> | 84% | 60,669 psi | 87% | 2730 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 62,874 psi | 90% | 2785 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 61,511 psi | 88% | 2769 fps | 100% |
| Norma 204 | <<locked>> | 86% | 62,250 psi | 89% | 2828 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 48,646 psi | 70% | 2753 fps | 100% |
| Norma MRP | <<locked>> | 90% | 60,524 psi | 87% | 2874 fps | 100% |
| Norma URP | <<locked>> | 84% | 58,958 psi | 85% | 2749 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 58,610 psi | 84% | 2858 fps | 100% |
| Ramshot Hunter | <<locked>> | 86% | 61,902 psi | 89% | 2815 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 59,944 psi | 86% | 2828 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,479 psi | 55% | 1745 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 61,264 psi | 88% | 2795 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 60,075 psi | 86% | 2828 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 62,642 psi | 90% | 2969 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 61,612 psi | 89% | 2946 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 62,598 psi | 90% | 2812 fps | 100% |
| Rottweil R 905 | <<locked>> | 90% | 61,090 psi | 88% | 2825 fps | 100% |
| Rottweil R 907 | <<locked>> | 84% | 62,149 psi | 89% | 2766 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 60,669 psi | 87% | 2730 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 62,874 psi | 90% | 2785 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 62,598 psi | 90% | 2602 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 59,582 psi | 86% | 2690 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 60,669 psi | 87% | 2822 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 60,321 psi | 87% | 2759 fps | 100% |
| Somchem S365 | <<locked>> | 86% | 60,321 psi | 87% | 2749 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 61,279 psi | 88% | 2789 fps | 100% |
| Unknown powder | <<locked>> | 82% | 58,987 psi | 85% | 2753 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 61,583 psi | 88% | 2674 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 59,161 psi | 85% | 2717 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 59,219 psi | 85% | 2753 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 53,824 psi | 77% | 2726 fps | 97.3% |
| Vihtavuori N550 | <<locked>> | 82% | 59,727 psi | 86% | 2762 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 60,031 psi | 86% | 2779 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 60,800 psi | 87% | 2897 fps | 100% |
| Vihtavuori N565 | <<locked>> | 96% | 60,423 psi | 87% | 2871 fps | 100% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 62,033 psi | 89% | 2943 fps | 100% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 59,625 psi | 86% | 2953 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 60,234 psi | 87% | 2694 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 62,308 psi | 90% | 2900 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 58,914 psi | 85% | 2762 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 2700 | <<locked>> | 80% | 58,523 psi | 84% | 2680 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 40,016 psi | 57% | 2457 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 53,243 psi | 76% | 2671 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 39,175 psi | 56% | 2533 fps | 96.5% |
| ADI APS 450 | <<locked>> | 80% | 59,364 psi | 85% | 2100 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 44,382 psi | 64% | 2582 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 39,581 psi | 57% | 2530 fps | 98.3% |
| ADI AR 2217 | <<locked>> | 82% | 31,415 psi | 45% | 2343 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 94% | 40,538 psi | 58% | 2635 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 26,643 psi | 38% | 2257 fps | 96.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,788 psi | 64% | 2582 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,788 psi | 64% | 2582 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,184 psi | 74% | 2674 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,367 psi | 64% | 2579 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,118 psi | 58% | 2533 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,986 psi | 56% | 2477 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,518 psi | 48% | 2421 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,598 psi | 63% | 2631 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 41,002 psi | 59% | 2631 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 96% | 39,958 psi | 57% | 2612 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 38,870 psi | 56% | 2454 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 37,405 psi | 54% | 2477 fps | 98.6% |
| Bofors RP30 | <<locked>> | 80% | 30,951 psi | 44% | 2359 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 40,118 psi | 58% | 2533 fps | 99.2% |
| Bofors RP7 | <<locked>> | 80% | 54,694 psi | 79% | 2671 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 30,153 psi | 43% | 2310 fps | 96% |
| Hodgdon H4350 | <<locked>> | 80% | 52,460 psi | 75% | 2671 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 37,231 psi | 53% | 2428 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,423 psi | 60% | 2513 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,080 psi | 69% | 2556 fps | 100% |
| Hodgdon Retumbo | 82.6 gr | 80% | 32,721 psi | 47% | 2461 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 80% | 55,376 psi | 80% | 2766 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,152 psi | 40% | 1522 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 57,566 psi | 83% | 2684 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,096 psi | 72% | 2615 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 80% | 56,202 psi | 81% | 2690 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 45,745 psi | 66% | 2546 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,540 psi | 63% | 2520 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 80% | 40,901 psi | 59% | 2566 fps | 98.6% |
| IMR 7977 Enduron | <<locked>> | 92% | 51,082 psi | 73% | 2618 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 86% | 29,602 psi | 43% | 2343 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 53,621 psi | 77% | 2638 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,054 psi | 75% | 2641 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,345 psi | 49% | 2343 fps | 99.6% |
| Norma 204 | <<locked>> | 80% | 50,705 psi | 73% | 2667 fps | 100% |
| Norma 217 | <<locked>> | 82% | 25,817 psi | 37% | 2254 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 42,467 psi | 61% | 2602 fps | 100% |
| Norma URP | <<locked>> | 80% | 51,880 psi | 75% | 2654 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 42,931 psi | 62% | 2618 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 80% | 50,691 psi | 73% | 2664 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,492 psi | 54% | 2480 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,805 psi | 41% | 1558 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,417 psi | 77% | 2694 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,938 psi | 75% | 2723 fps | 100% |
| ReloadSwiss RS 76 | 88.4 gr | 80% | 31,676 psi | 46% | 2434 fps | 98.9% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 33,286 psi | 48% | 2451 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 45,382 psi | 65% | 2559 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 80% | 43,729 psi | 63% | 2566 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 80% | 54,694 psi | 79% | 2671 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,621 psi | 77% | 2638 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,054 psi | 75% | 2641 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 58,987 psi | 85% | 2562 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,344 psi | 75% | 2595 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,395 psi | 62% | 2562 fps | 99.7% |
| Somchem S361 | <<locked>> | 80% | 46,122 psi | 66% | 2549 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 49,342 psi | 71% | 2608 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,077 psi | 63% | 2539 fps | 99.9% |
| Unknown powder | <<locked>> | 80% | 55,347 psi | 80% | 2703 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 51,256 psi | 74% | 2546 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 55,361 psi | 80% | 2667 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,376 psi | 54% | 2408 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 94% | 44,309 psi | 64% | 2566 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 55,941 psi | 80% | 2713 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,236 psi | 62% | 2543 fps | 100% |
| Vihtavuori N560 | 83.9 gr | 80% | 40,248 psi | 58% | 2559 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 80% | 34,795 psi | 50% | 2425 fps | 96.7% |
| Vihtavuori N568 | <<locked>> | 84% | 34,780 psi | 50% | 2470 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 90% | 41,205 psi | 59% | 2641 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,547 psi | 75% | 2598 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,274 psi | 52% | 2530 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,208 psi | 64% | 2546 fps | 99.7% |
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 81 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 267gr | CutEdge MTAC. Hodgdon Retumbo delivers the highest muzzle velocity at 2,976 fps; across all powders the maximum-charge window runs from 1,703 fps to 2,976 fps. ADI AR 2217 gives the best case fill at 100 %, and 81 of the 81 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 267.0 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, Vihtavuori N560 rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 267gr | CutEdge MTAC 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.