Load Specifications
Bullet Manufacturer:Nosler
Bullet Weight:250 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Case Length (l3):2.724"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:124.89 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:27"
Max. allowed Pressure:69,618 psi
Recommended Twist Rate:1:11.0
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 250gr | Nosler Expansion Tip bullet and 83 powders. The key underlying parameters are shown in the table above.
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>> | 94% | 61,772 psi | 89% | 2851 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 62,888 psi | 90% | 2874 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 59,582 psi | 86% | 2966 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 60,669 psi | 87% | 2976 fps | 99.8% |
| ADI APS 450 | <<locked>> | 82% | 61,163 psi | 88% | 2182 fps | 100% |
| ADI AR 2208 | <<locked>> | 82% | 62,250 psi | 89% | 2812 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 59,611 psi | 86% | 2894 fps | 100% |
| ADI AR 2213 | <<locked>> | 94% | 61,714 psi | 89% | 2966 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,477 psi | 80% | 2877 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 48,196 psi | 69% | 2854 fps | 96.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,980 psi | 72% | 2848 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 59,770 psi | 86% | 2890 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 59,770 psi | 86% | 2874 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 61,046 psi | 88% | 2884 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 62,845 psi | 90% | 2933 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 94% | 61,772 psi | 89% | 2956 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 94% | 59,408 psi | 85% | 2854 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 59,176 psi | 85% | 2930 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 60,336 psi | 87% | 2953 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 52,504 psi | 75% | 2913 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 62,192 psi | 89% | 2927 fps | 99.2% |
| Bofors RP15 | <<locked>> | 96% | 60,669 psi | 87% | 2940 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 58,711 psi | 84% | 2946 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 61,772 psi | 89% | 2956 fps | 100% |
| Bofors RP7 | <<locked>> | 84% | 60,220 psi | 87% | 2822 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 61,322 psi | 88% | 2953 fps | 100% |
| Hodgdon H414 | <<locked>> | 84% | 60,278 psi | 87% | 2881 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 62,555 psi | 90% | 2887 fps | 100% |
| Hodgdon H4831 | <<locked>> | 92% | 60,959 psi | 88% | 2900 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 59,828 psi | 86% | 2884 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 59,915 psi | 86% | 2792 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 62,120 psi | 89% | 3074 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 61,409 psi | 88% | 2927 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,492 psi | 54% | 1752 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 62,149 psi | 89% | 2861 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 61,467 psi | 88% | 2838 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 62,714 psi | 90% | 2858 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 61,424 psi | 88% | 2874 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 94% | 59,712 psi | 86% | 2946 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 98% | 59,814 psi | 86% | 2815 fps | 95.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,498 psi | 65% | 2766 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 62,497 psi | 90% | 2831 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 60,713 psi | 87% | 2838 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 62,961 psi | 90% | 2864 fps | 100% |
| Norma 204 | <<locked>> | 86% | 59,756 psi | 86% | 2874 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 46,064 psi | 66% | 2789 fps | 100% |
| Norma MRP | <<locked>> | 92% | 62,047 psi | 89% | 2976 fps | 100% |
| Norma URP | <<locked>> | 86% | 60,568 psi | 87% | 2854 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 61,061 psi | 88% | 2969 fps | 100% |
| Ramshot Hunter | <<locked>> | 86% | 59,480 psi | 85% | 2867 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 59,277 psi | 85% | 2897 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,305 psi | 55% | 1795 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 58,827 psi | 85% | 2848 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 61,598 psi | 88% | 2933 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 58,972 psi | 85% | 3012 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 58,276 psi | 84% | 2982 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 82% | 62,091 psi | 89% | 2805 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 60,379 psi | 87% | 2861 fps | 100% |
| Rottweil R 905 | <<locked>> | 92% | 62,671 psi | 90% | 2927 fps | 100% |
| Rottweil R 907 | <<locked>> | 84% | 60,220 psi | 87% | 2822 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 86% | 62,497 psi | 90% | 2831 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 60,713 psi | 87% | 2838 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 60,901 psi | 87% | 2661 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 61,757 psi | 89% | 2792 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 62,221 psi | 89% | 2923 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 61,351 psi | 88% | 2795 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 62,018 psi | 89% | 2854 fps | 99.9% |
| Somchem S365 | <<locked>> | 88% | 61,830 psi | 89% | 2851 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 62,990 psi | 90% | 2890 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 62,671 psi | 90% | 2762 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 62,482 psi | 90% | 2841 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 62,787 psi | 90% | 2874 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 61,714 psi | 89% | 2907 fps | 97.9% |
| Vihtavuori N550 | <<locked>> | 86% | 61,540 psi | 88% | 2851 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 61,583 psi | 88% | 2881 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 61,554 psi | 88% | 2982 fps | 100% |
| Vihtavuori N565 | <<locked>> | 98% | 61,699 psi | 89% | 2966 fps | 100% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 58,798 psi | 84% | 2979 fps | 99.7% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 55,782 psi | 80% | 2982 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 62,192 psi | 89% | 2795 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 60,452 psi | 87% | 2884 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 58,668 psi | 84% | 2949 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 59,001 psi | 85% | 2841 fps | 100% |
Start Load - Barrel Length: 27"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 38,798 psi | 56% | 2500 fps | 99.8% |
| Accurate 4350 | <<locked>> | 80% | 51,445 psi | 74% | 2723 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 42,148 psi | 61% | 2677 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 80% | 39,784 psi | 57% | 2618 fps | 96.6% |
| ADI APS 450 | <<locked>> | 80% | 59,263 psi | 85% | 2156 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 58,537 psi | 84% | 2766 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 42,670 psi | 61% | 2625 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 80% | 38,218 psi | 55% | 2566 fps | 97.1% |
| ADI AR 2217 | <<locked>> | 84% | 32,489 psi | 47% | 2428 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 98% | 44,846 psi | 64% | 2785 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 25,933 psi | 37% | 2283 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,163 psi | 62% | 2625 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,255 psi | 71% | 2730 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 57,014 psi | 82% | 2831 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,757 psi | 61% | 2618 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,696 psi | 56% | 2575 fps | 98.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,405 psi | 54% | 2523 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,271 psi | 46% | 2457 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,655 psi | 60% | 2677 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 41,974 psi | 60% | 2717 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 42,786 psi | 61% | 2598 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 36,027 psi | 52% | 2513 fps | 97.6% |
| Bofors RP30 | <<locked>> | 82% | 31,894 psi | 46% | 2448 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 38,696 psi | 56% | 2575 fps | 98.5% |
| Bofors RP7 | <<locked>> | 80% | 53,171 psi | 76% | 2720 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 30,908 psi | 44% | 2388 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 52,779 psi | 76% | 2776 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 55,143 psi | 79% | 2785 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 40,698 psi | 58% | 2566 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,059 psi | 58% | 2552 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,282 psi | 66% | 2605 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 31,531 psi | 45% | 2487 fps | 96.9% |
| Hodgdon Superformance | <<locked>> | 80% | 52,953 psi | 76% | 2808 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,065 psi | 40% | 1565 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,399 psi | 70% | 2664 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,404 psi | 78% | 2740 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 48,704 psi | 70% | 2671 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,105 psi | 60% | 2559 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 80% | 36,854 psi | 53% | 2546 fps | 96.8% |
| IMR 7977 Enduron | <<locked>> | 96% | 56,144 psi | 81% | 2759 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 90% | 32,648 psi | 47% | 2487 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 52,025 psi | 75% | 2690 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,459 psi | 72% | 2690 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 33,489 psi | 48% | 2388 fps | 99% |
| Norma 204 | <<locked>> | 80% | 48,892 psi | 70% | 2710 fps | 99.7% |
| Norma 217 | <<locked>> | 84% | 26,847 psi | 39% | 2343 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 40,727 psi | 59% | 2641 fps | 99.6% |
| Norma URP | <<locked>> | 80% | 50,038 psi | 72% | 2707 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 36,550 psi | 53% | 2552 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 80% | 48,820 psi | 70% | 2713 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 32,677 psi | 47% | 2438 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,863 psi | 41% | 1608 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,459 psi | 74% | 2746 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,719 psi | 71% | 2769 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 30,618 psi | 44% | 2464 fps | 97.8% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 36,941 psi | 53% | 2602 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 58,276 psi | 84% | 2759 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 43,816 psi | 63% | 2598 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 80% | 42,264 psi | 61% | 2608 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 80% | 53,171 psi | 76% | 2720 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,025 psi | 75% | 2690 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,459 psi | 72% | 2690 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 57,377 psi | 82% | 2618 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,995 psi | 73% | 2648 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,945 psi | 60% | 2605 fps | 99.1% |
| Somchem S355 | <<locked>> | 80% | 57,682 psi | 83% | 2753 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 44,628 psi | 64% | 2589 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 47,384 psi | 68% | 2661 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,757 psi | 61% | 2585 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 80% | 55,317 psi | 79% | 2674 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 51,488 psi | 74% | 2697 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,188 psi | 53% | 2467 fps | 98.5% |
| Vihtavuori N170 | <<locked>> | 94% | 50,343 psi | 72% | 2736 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 50,821 psi | 73% | 2703 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,829 psi | 60% | 2592 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 40,669 psi | 58% | 2631 fps | 97.4% |
| Vihtavuori N565 | <<locked>> | 80% | 33,562 psi | 48% | 2461 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 38,406 psi | 55% | 2618 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 94% | 44,976 psi | 65% | 2792 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,676 psi | 73% | 2651 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,939 psi | 76% | 2779 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 34,258 psi | 49% | 2569 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,088 psi | 56% | 2516 fps | 98.4% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 83 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 250gr | Nosler Expansion Tip. Hodgdon Retumbo delivers the highest muzzle velocity at 3,074 fps; across all powders the maximum-charge window runs from 1,752 fps to 3,074 fps. ADI AR 2217 gives the best case fill at 100 %, and 83 of the 83 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 250.0 gr projectile in 0.338" calls for a 1:11.0 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.