Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 265gr | Nosler AccuBond Long Range 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 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.
A valid access license is required to use the Personalized Load Calculator.
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% | 61,250 psi | 88% | 2769 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 62,076 psi | 89% | 2785 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 59,190 psi | 85% | 2887 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 60,220 psi | 87% | 2894 fps | 100% |
| ADI APS 450 | <<locked>> | 82% | 61,351 psi | 88% | 2133 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 62,700 psi | 90% | 2858 fps | 100% |
| ADI AR 2213 | <<locked>> | 92% | 60,988 psi | 88% | 2881 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 59,146 psi | 85% | 2854 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,372 psi | 74% | 2854 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,388 psi | 77% | 2825 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 62,787 psi | 90% | 2854 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 62,946 psi | 90% | 2831 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 62,033 psi | 89% | 2848 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 92% | 61,163 psi | 88% | 2871 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 94% | 62,816 psi | 90% | 2815 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 58,885 psi | 85% | 2848 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 59,915 psi | 86% | 2867 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,550 psi | 81% | 2904 fps | 99.1% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 47,964 psi | 69% | 2766 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 61,351 psi | 88% | 2844 fps | 99.5% |
| Bofors RP15 | <<locked>> | 94% | 60,263 psi | 87% | 2861 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 62,729 psi | 90% | 2923 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 61,163 psi | 88% | 2871 fps | 100% |
| Bofors RP7 | <<locked>> | 84% | 62,859 psi | 90% | 2782 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 60,843 psi | 87% | 2874 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 59,292 psi | 85% | 2792 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 61,380 psi | 88% | 2799 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 60,133 psi | 86% | 2815 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 90% | 58,958 psi | 85% | 2799 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 62,961 psi | 90% | 2749 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 62,149 psi | 89% | 2992 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 60,365 psi | 87% | 2835 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,681 psi | 54% | 1713 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 61,177 psi | 88% | 2772 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 60,307 psi | 87% | 2749 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 62,076 psi | 89% | 2772 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 60,423 psi | 87% | 2792 fps | 100% |
| IMR 7828 SSC | <<locked>> | 92% | 59,176 psi | 85% | 2864 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 98% | 62,714 psi | 90% | 2792 fps | 97.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,066 psi | 70% | 2753 fps | 99.9% |
| Lovex S065 | <<locked>> | 84% | 61,424 psi | 88% | 2746 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 59,785 psi | 86% | 2749 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 62,642 psi | 90% | 2785 fps | 100% |
| Norma 204 | <<locked>> | 86% | 62,946 psi | 90% | 2841 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 49,763 psi | 71% | 2772 fps | 100% |
| Norma MRP | <<locked>> | 90% | 61,395 psi | 88% | 2887 fps | 100% |
| Norma URP | <<locked>> | 84% | 59,785 psi | 86% | 2766 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 60,669 psi | 87% | 2890 fps | 100% |
| Ramshot Hunter | <<locked>> | 86% | 62,671 psi | 90% | 2831 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 58,827 psi | 85% | 2818 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,537 psi | 55% | 1749 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 62,163 psi | 89% | 2808 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 60,800 psi | 87% | 2841 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 58,900 psi | 85% | 2933 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 62,671 psi | 90% | 2966 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 59,451 psi | 85% | 2776 fps | 100% |
| Rottweil R 905 | <<locked>> | 90% | 61,873 psi | 89% | 2838 fps | 100% |
| Rottweil R 907 | <<locked>> | 84% | 62,859 psi | 90% | 2782 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 61,424 psi | 88% | 2746 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 59,785 psi | 86% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 60,597 psi | 87% | 2707 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 61,438 psi | 88% | 2835 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 61,061 psi | 88% | 2772 fps | 100% |
| Somchem S365 | <<locked>> | 86% | 61,206 psi | 88% | 2762 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 62,134 psi | 89% | 2805 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 61,540 psi | 88% | 2674 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 61,554 psi | 88% | 2753 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 61,975 psi | 89% | 2792 fps | 100% |
| Vihtavuori N170 | <<locked>> | 98% | 60,930 psi | 88% | 2831 fps | 98.4% |
| Vihtavuori N550 | <<locked>> | 84% | 60,510 psi | 87% | 2762 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 61,061 psi | 88% | 2799 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 60,843 psi | 87% | 2897 fps | 100% |
| Vihtavuori N565 | <<locked>> | 96% | 61,453 psi | 88% | 2887 fps | 100% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 62,975 psi | 90% | 2959 fps | 100% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 59,770 psi | 86% | 2969 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 60,930 psi | 88% | 2703 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 59,466 psi | 85% | 2792 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 58,827 psi | 85% | 2867 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 62,279 psi | 89% | 2808 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% | 41,162 psi | 59% | 2480 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 54,331 psi | 78% | 2687 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 44,846 psi | 64% | 2657 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 80% | 42,351 psi | 61% | 2602 fps | 97.9% |
| ADI APS 450 | <<locked>> | 80% | 59,277 psi | 85% | 2103 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 45,092 psi | 65% | 2598 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 40,480 psi | 58% | 2549 fps | 98.4% |
| ADI AR 2217 | <<locked>> | 80% | 30,211 psi | 43% | 2310 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 94% | 41,423 psi | 60% | 2654 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 27,572 psi | 40% | 2283 fps | 97.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,556 psi | 65% | 2602 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,880 psi | 75% | 2690 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,136 psi | 65% | 2595 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,133 psi | 59% | 2556 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,914 psi | 57% | 2497 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,389 psi | 49% | 2444 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,657 psi | 64% | 2654 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 39,102 psi | 56% | 2592 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 96% | 41,249 psi | 59% | 2638 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 39,494 psi | 57% | 2470 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 38,290 psi | 55% | 2500 fps | 98.8% |
| Bofors RP30 | <<locked>> | 80% | 31,937 psi | 46% | 2385 fps | 96.4% |
| Bofors RP5 | <<locked>> | 80% | 41,133 psi | 59% | 2556 fps | 99.4% |
| Bofors RP7 | <<locked>> | 80% | 55,608 psi | 80% | 2687 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 32,779 psi | 47% | 2382 fps | 97% |
| Hodgdon H414 | <<locked>> | 80% | 55,521 psi | 80% | 2740 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 57,725 psi | 83% | 2749 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 43,004 psi | 62% | 2546 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,337 psi | 61% | 2533 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,863 psi | 70% | 2572 fps | 100% |
| Hodgdon Retumbo | 82.5 gr | 80% | 33,605 psi | 48% | 2487 fps | 98.6% |
| Hodgdon Superformance | <<locked>> | 80% | 56,130 psi | 81% | 2779 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,311 psi | 41% | 1529 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,778 psi | 73% | 2631 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 80% | 56,811 psi | 82% | 2703 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 51,169 psi | 74% | 2631 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,222 psi | 64% | 2536 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 80% | 39,131 psi | 56% | 2533 fps | 98.2% |
| IMR 7977 Enduron | <<locked>> | 92% | 51,924 psi | 75% | 2635 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 86% | 30,618 psi | 44% | 2372 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 54,404 psi | 78% | 2651 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,924 psi | 76% | 2657 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,520 psi | 51% | 2369 fps | 99.7% |
| Norma 204 | <<locked>> | 80% | 51,445 psi | 74% | 2684 fps | 100% |
| Norma 217 | <<locked>> | 80% | 25,135 psi | 36% | 2231 fps | 95% |
| Norma MRP | <<locked>> | 80% | 43,395 psi | 62% | 2621 fps | 100% |
| Norma URP | <<locked>> | 80% | 52,721 psi | 76% | 2671 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,972 psi | 56% | 2543 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 80% | 51,445 psi | 74% | 2680 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,940 psi | 50% | 2431 fps | 98.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,008 psi | 42% | 1565 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 54,360 psi | 78% | 2710 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,707 psi | 76% | 2740 fps | 100% |
| ReloadSwiss RS 76 | 88.3 gr | 80% | 32,648 psi | 47% | 2461 fps | 99.1% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 34,345 psi | 49% | 2480 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 46,079 psi | 66% | 2572 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 80% | 44,585 psi | 64% | 2582 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 80% | 55,608 psi | 80% | 2687 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,404 psi | 78% | 2651 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,924 psi | 76% | 2657 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,185 psi | 76% | 2608 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,237 psi | 64% | 2579 fps | 99.7% |
| Somchem S361 | <<locked>> | 80% | 46,891 psi | 67% | 2566 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 50,270 psi | 72% | 2625 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,136 psi | 65% | 2562 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 57,841 psi | 83% | 2631 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 54,143 psi | 78% | 2661 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,363 psi | 57% | 2451 fps | 99.3% |
| Vihtavuori N170 | <<locked>> | 90% | 46,601 psi | 67% | 2608 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 53,403 psi | 77% | 2667 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,454 psi | 64% | 2566 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,207 psi | 62% | 2615 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 80% | 35,839 psi | 51% | 2451 fps | 96.9% |
| Vihtavuori N568 | <<locked>> | 84% | 35,752 psi | 51% | 2497 fps | 95.6% |
| Vihtavuori N570 | 96.3 gr | 90% | 41,843 psi | 60% | 2664 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,243 psi | 76% | 2612 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 55,695 psi | 80% | 2743 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,376 psi | 54% | 2556 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,365 psi | 59% | 2497 fps | 99.3% |
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 | 265gr | Nosler AccuBond Long Range. Hodgdon Retumbo delivers the highest muzzle velocity at 2,992 fps; across all powders the maximum-charge window runs from 1,713 fps to 2,992 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 265.0 gr projectile in 0.338" calls for a 1:11.5 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 N570 rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 265gr | Nosler AccuBond Long Range 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.