Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 227gr | CutEdge MTAC bullet and 90 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N560, Accurate MAGPRO and Norma MRP.
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>> | 96% | 60,901 psi | 87% | 2979 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 62,221 psi | 89% | 3009 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 58,856 psi | 85% | 3094 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 94% | 59,814 psi | 86% | 3097 fps | 99.4% |
| ADI APS 450 | <<locked>> | 84% | 62,975 psi | 90% | 2316 fps | 100% |
| ADI AR 2208 | <<locked>> | 84% | 62,497 psi | 90% | 2956 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 59,219 psi | 85% | 3025 fps | 100% |
| ADI AR 2213 | <<locked>> | 96% | 61,046 psi | 88% | 3094 fps | 99.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,111 psi | 73% | 2936 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,629 psi | 66% | 2897 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 59,263 psi | 85% | 3018 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 60,075 psi | 86% | 2927 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 59,292 psi | 85% | 3012 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 60,727 psi | 87% | 3025 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 62,497 psi | 90% | 3068 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 96% | 60,872 psi | 87% | 3084 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 98% | 62,221 psi | 89% | 3031 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,798 psi | 83% | 3051 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 59,321 psi | 85% | 3084 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 62,337 psi | 90% | 3051 fps | 98.6% |
| Bofors RP15 | <<locked>> | 98% | 59,756 psi | 86% | 3068 fps | 100% |
| Bofors RP3 | <<locked>> | 82% | 61,540 psi | 88% | 2946 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,621 psi | 77% | 3005 fps | 99.7% |
| Bofors RP5 | <<locked>> | 96% | 60,872 psi | 87% | 3084 fps | 100% |
| Bofors RP7 | <<locked>> | 86% | 60,075 psi | 86% | 2956 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,492 psi | 81% | 3022 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 61,511 psi | 88% | 2972 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 59,901 psi | 86% | 3015 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 62,656 psi | 90% | 3028 fps | 100% |
| Hodgdon H4831 | <<locked>> | 94% | 60,829 psi | 87% | 3028 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 59,451 psi | 85% | 3009 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 59,393 psi | 85% | 2927 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,797 psi | 82% | 3140 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 61,148 psi | 88% | 3061 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,043 psi | 53% | 1837 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 61,685 psi | 89% | 2936 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 62,120 psi | 89% | 2995 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 86% | 61,670 psi | 89% | 2979 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 62,221 psi | 89% | 2995 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 61,235 psi | 88% | 3002 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 96% | 58,856 psi | 85% | 3074 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 40,886 psi | 59% | 2799 fps | 97.6% |
| Lovex S062 | <<locked>> | 82% | 62,091 psi | 89% | 2920 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 62,366 psi | 90% | 2969 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 60,553 psi | 87% | 2972 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 57,972 psi | 83% | 2940 fps | 100% |
| Norma 204 | <<locked>> | 88% | 59,654 psi | 86% | 3009 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 41,089 psi | 59% | 2822 fps | 99.3% |
| Norma MRP | <<locked>> | 94% | 61,134 psi | 88% | 3104 fps | 100% |
| Norma URP | <<locked>> | 88% | 60,278 psi | 87% | 2989 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 59,988 psi | 86% | 3094 fps | 100% |
| Ramshot Hunter | <<locked>> | 88% | 59,103 psi | 85% | 3002 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 62,946 psi | 90% | 3081 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,884 psi | 54% | 1883 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 61,148 psi | 88% | 2963 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 60,350 psi | 87% | 3005 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 62,410 psi | 90% | 3035 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 61,090 psi | 88% | 3068 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 57,798 psi | 83% | 3136 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 52,489 psi | 75% | 3025 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 84% | 61,801 psi | 89% | 2943 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 60,234 psi | 87% | 2992 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 94% | 62,018 psi | 89% | 3054 fps | 100% |
| Rottweil R 907 | <<locked>> | 86% | 60,075 psi | 86% | 2956 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 88% | 62,366 psi | 90% | 2969 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 62,091 psi | 89% | 2920 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 60,553 psi | 87% | 2972 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 59,640 psi | 86% | 2956 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 61,192 psi | 88% | 2802 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 61,873 psi | 89% | 2927 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 61,554 psi | 88% | 3051 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 61,090 psi | 88% | 2936 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 61,989 psi | 89% | 2982 fps | 99.6% |
| Somchem S365 | <<locked>> | 90% | 61,046 psi | 88% | 2986 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 62,366 psi | 90% | 3018 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 62,642 psi | 90% | 2904 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 62,250 psi | 89% | 2979 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 62,134 psi | 89% | 2999 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 56,855 psi | 82% | 2959 fps | 96.1% |
| Vihtavuori N540 | <<locked>> | 82% | 62,961 psi | 90% | 2897 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 61,105 psi | 88% | 2986 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 60,437 psi | 87% | 3012 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 60,785 psi | 87% | 3110 fps | 99.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 60,582 psi | 87% | 3084 fps | 99.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 53,534 psi | 77% | 3031 fps | 98.6% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 50,415 psi | 72% | 3018 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 62,062 psi | 89% | 2930 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 60,075 psi | 86% | 3018 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 98% | 61,177 psi | 88% | 3127 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 62,917 psi | 90% | 3022 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% | 35,012 psi | 50% | 2543 fps | 98.7% |
| Accurate 4350 | <<locked>> | 80% | 47,166 psi | 68% | 2792 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 38,290 psi | 55% | 2717 fps | 96.4% |
| Accurate MAGPRO | 90.4 gr | 82% | 38,783 psi | 56% | 2713 fps | 95.1% |
| ADI APS 450 | <<locked>> | 80% | 59,045 psi | 85% | 2260 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 55,085 psi | 79% | 2858 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 39,334 psi | 56% | 2677 fps | 97.6% |
| ADI AR 2213 | <<locked>> | 82% | 37,579 psi | 54% | 2667 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 90% | 36,260 psi | 52% | 2631 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 86% | 28,529 psi | 41% | 2470 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,813 psi | 57% | 2677 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 56,449 psi | 81% | 2877 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,353 psi | 65% | 2802 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,576 psi | 76% | 2913 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,407 psi | 57% | 2674 fps | 97.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,157 psi | 51% | 2615 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,837 psi | 49% | 2572 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,254 psi | 42% | 2487 fps | 97.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,275 psi | 54% | 2720 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 45,397 psi | 65% | 2762 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 32,663 psi | 47% | 2549 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 57,566 psi | 83% | 2894 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 35,259 psi | 51% | 2648 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 35,157 psi | 51% | 2615 fps | 96.5% |
| Bofors RP7 | <<locked>> | 80% | 49,647 psi | 71% | 2795 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 34,621 psi | 50% | 2595 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 57,580 psi | 83% | 2920 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 48,907 psi | 70% | 2848 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 51,517 psi | 74% | 2861 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 37,405 psi | 54% | 2612 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 82% | 39,450 psi | 57% | 2657 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,699 psi | 61% | 2680 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 32,721 psi | 47% | 2631 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 48,878 psi | 70% | 2877 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,804 psi | 40% | 1647 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 57,943 psi | 83% | 2887 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,136 psi | 65% | 2730 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,213 psi | 74% | 2822 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 44,773 psi | 64% | 2736 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 39,146 psi | 56% | 2615 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 82% | 36,100 psi | 52% | 2644 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 96% | 35,723 psi | 51% | 2677 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 58,363 psi | 84% | 2874 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 48,602 psi | 70% | 2769 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,934 psi | 67% | 2762 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 30,023 psi | 43% | 2418 fps | 97.1% |
| Norma 204 | <<locked>> | 80% | 45,382 psi | 65% | 2776 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 29,080 psi | 42% | 2520 fps | 95.1% |
| Norma MRP | 86.6 gr | 80% | 36,883 psi | 53% | 2684 fps | 98.4% |
| Norma URP | <<locked>> | 80% | 46,325 psi | 67% | 2782 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 35,650 psi | 51% | 2648 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 45,223 psi | 65% | 2782 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 82% | 31,604 psi | 45% | 2520 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,384 psi | 41% | 1686 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 57,174 psi | 82% | 2907 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 56,086 psi | 81% | 2953 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,195 psi | 68% | 2815 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,585 psi | 65% | 2838 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 82% | 29,544 psi | 42% | 2533 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 38,435 psi | 55% | 2753 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 54,201 psi | 78% | 2844 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 40,683 psi | 58% | 2654 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 80% | 38,609 psi | 55% | 2654 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 80% | 49,647 psi | 71% | 2795 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,602 psi | 70% | 2769 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 58,363 psi | 84% | 2874 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,934 psi | 67% | 2762 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 55,898 psi | 80% | 2904 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,114 psi | 78% | 2713 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,456 psi | 68% | 2717 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,276 psi | 55% | 2651 fps | 97.5% |
| Somchem S355 | <<locked>> | 80% | 53,969 psi | 78% | 2838 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 41,379 psi | 59% | 2641 fps | 96.3% |
| Somchem S365 | <<locked>> | 80% | 43,323 psi | 62% | 2733 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,189 psi | 56% | 2638 fps | 98.4% |
| Vihtavuori N150 | <<locked>> | 80% | 51,692 psi | 74% | 2762 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,790 psi | 69% | 2772 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,939 psi | 49% | 2510 fps | 96.6% |
| Vihtavuori N170 | <<locked>> | 98% | 52,982 psi | 76% | 2897 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 59,117 psi | 85% | 2848 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 47,065 psi | 68% | 2779 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,782 psi | 54% | 2644 fps | 100% |
| Vihtavuori N560 | 86.6 gr | 80% | 37,057 psi | 53% | 2674 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 86% | 37,188 psi | 53% | 2664 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 92% | 39,972 psi | 57% | 2772 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 98% | 46,833 psi | 67% | 2949 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,992 psi | 68% | 2730 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,066 psi | 70% | 2851 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 29,994 psi | 43% | 2602 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,839 psi | 51% | 2562 fps | 96.6% |
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 90 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 227gr | CutEdge MTAC. Hodgdon Retumbo delivers the highest muzzle velocity at 3,140 fps; across all powders the maximum-charge window runs from 1,837 fps to 3,140 fps. ADI AR 2217 gives the best case fill at 100 %, and 90 of the 90 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 227.0 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 2225, Alliant Reloder-25 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. Vihtavuori N560, Accurate MAGPRO, Norma MRP rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 227gr | 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.