Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 225gr | CutEdge MTH bullet and 89 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Vihtavuori N560 and Accurate MAGPRO.
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>> | 84% | 61,960 psi | 89% | 2953 fps | 100% |
| Accurate 3100 | <<locked>> | 96% | 62,337 psi | 90% | 3012 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 59,451 psi | 85% | 2992 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 62,511 psi | 90% | 3146 fps | 99.4% |
| ADI APS 450 | <<locked>> | 82% | 61,148 psi | 88% | 2313 fps | 100% |
| ADI AR 2208 | <<locked>> | 82% | 59,669 psi | 86% | 2940 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 60,553 psi | 87% | 3064 fps | 100% |
| ADI AR 2213 | <<locked>> | 96% | 62,874 psi | 90% | 3140 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,591 psi | 76% | 2979 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,963 psi | 67% | 2940 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 61,380 psi | 88% | 2959 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 60,756 psi | 87% | 3048 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 62,091 psi | 89% | 3058 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 59,973 psi | 86% | 3051 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 96% | 62,685 psi | 90% | 3127 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 96% | 59,857 psi | 86% | 3018 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 59,596 psi | 86% | 3091 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 61,046 psi | 88% | 3123 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 49,124 psi | 71% | 2992 fps | 96.4% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 59,654 psi | 86% | 3031 fps | 98.4% |
| Bofors RP15 | <<locked>> | 98% | 61,322 psi | 88% | 3104 fps | 100% |
| Bofors RP3 | <<locked>> | 82% | 62,816 psi | 90% | 2979 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,288 psi | 79% | 3048 fps | 99.8% |
| Bofors RP5 | <<locked>> | 96% | 62,685 psi | 90% | 3127 fps | 100% |
| Bofors RP7 | <<locked>> | 86% | 61,337 psi | 88% | 2992 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,099 psi | 78% | 3002 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 82% | 62,685 psi | 90% | 3009 fps | 100% |
| Hodgdon H414 | <<locked>> | 84% | 62,468 psi | 90% | 3068 fps | 100% |
| Hodgdon H4350 | <<locked>> | 88% | 62,192 psi | 89% | 3041 fps | 100% |
| Hodgdon H4831 | <<locked>> | 98% | 61,351 psi | 88% | 3054 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 94% | 60,974 psi | 88% | 3048 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 60,713 psi | 87% | 2959 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,494 psi | 84% | 3182 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 62,801 psi | 90% | 3100 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,217 psi | 53% | 1860 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 62,990 psi | 90% | 2972 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 62,453 psi | 90% | 2963 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 60,481 psi | 87% | 2959 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 59,567 psi | 86% | 2982 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 86% | 62,917 psi | 90% | 3015 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 61,003 psi | 88% | 2995 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 62,700 psi | 90% | 3041 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 94% | 60,742 psi | 87% | 3117 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,351 psi | 61% | 2841 fps | 98% |
| Lovex S065 | <<locked>> | 86% | 59,785 psi | 86% | 2956 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 61,757 psi | 89% | 3009 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 59,408 psi | 85% | 2976 fps | 100% |
| Norma 204 | <<locked>> | 88% | 61,134 psi | 88% | 3048 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 42,612 psi | 61% | 2867 fps | 99.6% |
| Norma MRP | <<locked>> | 94% | 62,975 psi | 90% | 3146 fps | 100% |
| Norma URP | <<locked>> | 88% | 61,583 psi | 88% | 3025 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 61,293 psi | 88% | 3130 fps | 100% |
| Ramshot Hunter | <<locked>> | 88% | 60,626 psi | 87% | 3038 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 62,801 psi | 90% | 3094 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,058 psi | 55% | 1906 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 62,192 psi | 89% | 2999 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 61,888 psi | 89% | 3041 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 59,799 psi | 86% | 3015 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 62,714 psi | 90% | 3107 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 59,741 psi | 86% | 3179 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,520 psi | 78% | 3074 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 82% | 59,132 psi | 85% | 2930 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 61,467 psi | 88% | 3028 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 92% | 59,466 psi | 85% | 3038 fps | 100% |
| Rottweil R 907 | <<locked>> | 86% | 61,337 psi | 88% | 2992 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 86% | 59,785 psi | 86% | 2956 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 61,757 psi | 89% | 3009 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 61,003 psi | 88% | 2992 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 62,265 psi | 89% | 2835 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 59,088 psi | 85% | 2913 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 59,016 psi | 85% | 3035 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 62,352 psi | 90% | 2969 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 59,292 psi | 85% | 2966 fps | 99.5% |
| Somchem S365 | <<locked>> | 90% | 62,613 psi | 90% | 3022 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 59,785 psi | 86% | 3002 fps | 100% |
| Unknown powder | <<locked>> | 86% | 61,786 psi | 89% | 3028 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 60,655 psi | 87% | 2904 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 62,221 psi | 89% | 2992 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 61,438 psi | 88% | 3009 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 62,714 psi | 90% | 3045 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 62,076 psi | 89% | 3048 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 58,958 psi | 85% | 3104 fps | 99.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 62,381 psi | 90% | 3127 fps | 99.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,216 psi | 79% | 3074 fps | 98.9% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 52,736 psi | 76% | 3068 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 59,364 psi | 85% | 2917 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 62,468 psi | 90% | 3068 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 58,914 psi | 85% | 3114 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 61,960 psi | 89% | 3031 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% | 54,346 psi | 78% | 2844 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 35,940 psi | 52% | 2575 fps | 98.9% |
| Accurate 4350 | <<locked>> | 80% | 48,327 psi | 69% | 2828 fps | 100% |
| Accurate MAGPRO | 95.3 gr | 84% | 40,596 psi | 58% | 2762 fps | 95% |
| ADI APS 450 | <<locked>> | 80% | 58,987 psi | 85% | 2283 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 56,173 psi | 81% | 2890 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 40,277 psi | 58% | 2713 fps | 97.9% |
| ADI AR 2213 | <<locked>> | 80% | 35,868 psi | 52% | 2641 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 88% | 34,780 psi | 50% | 2608 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 86% | 29,298 psi | 42% | 2510 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 57,609 psi | 83% | 2910 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,383 psi | 67% | 2835 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,867 psi | 77% | 2949 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,364 psi | 58% | 2710 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,085 psi | 52% | 2651 fps | 96.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,737 psi | 50% | 2605 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,037 psi | 43% | 2523 fps | 98% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,537 psi | 55% | 2759 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 45,368 psi | 65% | 2920 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 46,340 psi | 67% | 2802 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 33,475 psi | 48% | 2585 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 58,726 psi | 84% | 2930 fps | 100% |
| Bofors RP30 | <<locked>> | 86% | 33,881 psi | 49% | 2625 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 36,085 psi | 52% | 2651 fps | 96.9% |
| Bofors RP7 | <<locked>> | 80% | 50,647 psi | 73% | 2831 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 86% | 33,388 psi | 48% | 2575 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 58,639 psi | 84% | 2953 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 54,447 psi | 78% | 2956 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 48,182 psi | 69% | 2825 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 84% | 38,624 psi | 55% | 2654 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 37,652 psi | 54% | 2631 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,700 psi | 63% | 2713 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 82% | 31,386 psi | 45% | 2605 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 50,183 psi | 72% | 2917 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,847 psi | 40% | 1663 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 59,146 psi | 85% | 2927 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 55,114 psi | 79% | 2864 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,650 psi | 77% | 2858 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,093 psi | 66% | 2766 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,199 psi | 75% | 2858 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 41,655 psi | 60% | 2694 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 39,987 psi | 57% | 2651 fps | 96.2% |
| IMR 7828 SSC | <<locked>> | 80% | 36,811 psi | 53% | 2677 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 94% | 34,418 psi | 49% | 2657 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 49,487 psi | 71% | 2802 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 47,790 psi | 69% | 2795 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 30,748 psi | 44% | 2451 fps | 97.4% |
| Norma 204 | <<locked>> | 80% | 46,441 psi | 67% | 2812 fps | 99% |
| Norma 217 | <<locked>> | 90% | 30,037 psi | 43% | 2559 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 37,942 psi | 55% | 2720 fps | 98.7% |
| Norma URP | <<locked>> | 80% | 47,268 psi | 68% | 2815 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,348 psi | 55% | 2726 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 80% | 46,296 psi | 67% | 2818 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,301 psi | 48% | 2579 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,413 psi | 41% | 1703 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 58,276 psi | 84% | 2943 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 57,450 psi | 83% | 2986 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,515 psi | 70% | 2851 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,731 psi | 67% | 2874 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 28,311 psi | 41% | 2507 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 39,755 psi | 57% | 2795 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 55,201 psi | 79% | 2877 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 41,597 psi | 60% | 2690 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 80% | 39,595 psi | 57% | 2690 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 80% | 50,647 psi | 73% | 2831 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,487 psi | 71% | 2802 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 47,790 psi | 69% | 2795 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 57,072 psi | 82% | 2940 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,911 psi | 79% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,530 psi | 70% | 2753 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,262 psi | 56% | 2687 fps | 97.8% |
| Somchem S355 | <<locked>> | 80% | 54,926 psi | 79% | 2871 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 42,221 psi | 61% | 2677 fps | 96.7% |
| Somchem S365 | <<locked>> | 80% | 44,469 psi | 64% | 2766 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,118 psi | 58% | 2671 fps | 98.7% |
| Unknown powder | <<locked>> | 80% | 50,705 psi | 73% | 2871 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 47,210 psi | 68% | 2713 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,778 psi | 73% | 2835 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,678 psi | 48% | 2520 fps | 96.6% |
| Vihtavuori N550 | <<locked>> | 80% | 51,343 psi | 74% | 2881 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,885 psi | 56% | 2680 fps | 100% |
| Vihtavuori N560 | 89.4 gr | 82% | 38,812 psi | 56% | 2730 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 84% | 35,723 psi | 51% | 2641 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 92% | 41,234 psi | 59% | 2815 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 98% | 49,052 psi | 70% | 2999 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,109 psi | 69% | 2762 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,447 psi | 78% | 2956 fps | 100% |
| Winchester StaBALL HD | 88.2 gr | 80% | 31,198 psi | 45% | 2641 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,074 psi | 58% | 2671 fps | 97.9% |
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 95 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 225gr | CutEdge MTH. Hodgdon Retumbo delivers the highest muzzle velocity at 3,182 fps; across all powders the maximum-charge window runs from 1,860 fps to 3,182 fps. ADI AR 2217 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (480 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 225.0 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. Winchester StaBALL HD, Vihtavuori N560, Accurate MAGPRO rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 225gr | CutEdge MTH they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, Lovex D100 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.