Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 220gr | Peregrine Glider (Glider GRM) bullet and 92 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 7828 SSC, Winchester StaBALL HD 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.
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 2700 | <<locked>> | 82% | 62,178 psi | 89% | 2986 fps | 100% |
| Accurate 3100 | <<locked>> | 96% | 59,422 psi | 85% | 3002 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 61,902 psi | 89% | 2940 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 60,771 psi | 87% | 3035 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 61,583 psi | 88% | 3176 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 96% | 62,729 psi | 90% | 3182 fps | 99.5% |
| ADI APS 450 | <<locked>> | 82% | 60,988 psi | 88% | 2323 fps | 100% |
| ADI AR 2208 | <<locked>> | 84% | 61,395 psi | 88% | 2986 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 61,960 psi | 89% | 3104 fps | 100% |
| ADI AR 2213 | <<locked>> | 96% | 59,712 psi | 86% | 3117 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,821 psi | 72% | 2949 fps | 99% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,353 psi | 64% | 2910 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 61,931 psi | 89% | 3097 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 62,888 psi | 90% | 3005 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 61,830 psi | 89% | 3087 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 59,277 psi | 85% | 3051 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 61,119 psi | 88% | 3091 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 96% | 59,567 psi | 86% | 3107 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 98% | 60,800 psi | 87% | 3061 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,376 psi | 81% | 3077 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 62,250 psi | 89% | 3166 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 61,076 psi | 88% | 3071 fps | 98.2% |
| Bofors RP15ᴾ | <<locked>> | 100% | 62,337 psi | 90% | 3143 fps | 100% |
| Bofors RP3 | <<locked>> | 82% | 60,336 psi | 87% | 2976 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,257 psi | 75% | 3025 fps | 99.4% |
| Bofors RP5 | <<locked>> | 96% | 59,567 psi | 86% | 3107 fps | 100% |
| Bofors RP7 | <<locked>> | 88% | 62,917 psi | 90% | 3035 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,201 psi | 79% | 3041 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 82% | 60,307 psi | 87% | 3002 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 62,772 psi | 90% | 3097 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 61,409 psi | 88% | 3054 fps | 100% |
| Hodgdon H4831 | <<locked>> | 94% | 59,408 psi | 85% | 3048 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 96% | 62,395 psi | 90% | 3091 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 61,946 psi | 89% | 2999 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,172 psi | 79% | 3159 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 59,669 psi | 86% | 3084 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,970 psi | 53% | 1867 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 60,814 psi | 87% | 2966 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 61,061 psi | 88% | 3025 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 86% | 60,785 psi | 87% | 3009 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 61,061 psi | 88% | 3022 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 60,205 psi | 86% | 3028 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 98% | 61,511 psi | 88% | 3153 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 39,798 psi | 57% | 2812 fps | 96.9% |
| Lovex S062 | <<locked>> | 82% | 60,974 psi | 88% | 2953 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 61,192 psi | 88% | 2999 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 59,335 psi | 85% | 2999 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,507 psi | 81% | 2963 fps | 100% |
| Norma 203B | <<locked>> | 82% | 62,323 psi | 90% | 3018 fps | 100% |
| Norma 204 | <<locked>> | 90% | 62,584 psi | 90% | 3091 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 39,900 psi | 57% | 2835 fps | 98.9% |
| Norma MRP | <<locked>> | 94% | 59,698 psi | 86% | 3130 fps | 100% |
| Norma URP | <<locked>> | 88% | 58,958 psi | 85% | 3015 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 62,990 psi | 90% | 3176 fps | 100% |
| Ramshot Hunter | <<locked>> | 90% | 61,859 psi | 89% | 3081 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 61,308 psi | 88% | 3100 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,797 psi | 54% | 1909 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 60,002 psi | 86% | 2989 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 58,871 psi | 85% | 3035 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 61,119 psi | 88% | 3061 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 59,756 psi | 86% | 3097 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,217 psi | 81% | 3153 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,908 psi | 73% | 3041 fps | 98.4% |
| Rottweil R 902 | <<locked>> | 82% | 62,787 psi | 90% | 2959 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 60,568 psi | 87% | 2972 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 62,990 psi | 90% | 3071 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 94% | 60,742 psi | 87% | 3077 fps | 100% |
| Rottweil R 907 | <<locked>> | 88% | 62,917 psi | 90% | 3035 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 88% | 61,192 psi | 88% | 2999 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 60,974 psi | 88% | 2953 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 59,335 psi | 85% | 2999 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 62,540 psi | 90% | 3038 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 60,162 psi | 86% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 60,698 psi | 87% | 2956 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 60,278 psi | 87% | 3077 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 59,944 psi | 86% | 2966 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 60,843 psi | 87% | 3009 fps | 99.4% |
| Somchem S365 | <<locked>> | 90% | 59,741 psi | 86% | 3015 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 61,134 psi | 88% | 3045 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 61,627 psi | 89% | 2933 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 60,974 psi | 88% | 3005 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 60,843 psi | 87% | 3025 fps | 100% |
| Vihtavuori N540 | <<locked>> | 82% | 61,859 psi | 89% | 2927 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 60,017 psi | 86% | 3012 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 58,958 psi | 85% | 3035 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 59,408 psi | 85% | 3130 fps | 99.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 59,088 psi | 85% | 3104 fps | 99.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,069 psi | 75% | 3045 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 60,916 psi | 88% | 2959 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 62,946 psi | 90% | 3100 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 98% | 59,379 psi | 85% | 3153 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 61,583 psi | 88% | 3048 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% | 58,131 psi | 84% | 2933 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 34,113 psi | 49% | 2556 fps | 98.2% |
| Accurate 4064 | <<locked>> | 80% | 58,160 psi | 84% | 2894 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 46,064 psi | 66% | 2815 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 37,246 psi | 54% | 2730 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 84% | 40,596 psi | 58% | 2792 fps | 95.4% |
| ADI APS 450 | <<locked>> | 80% | 58,943 psi | 85% | 2293 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 54,114 psi | 78% | 2887 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,450 psi | 55% | 2694 fps | 97.1% |
| ADI AR 2213 | <<locked>> | 82% | 36,738 psi | 53% | 2680 fps | 95% |
| ADI AR 2217 | <<locked>> | 92% | 37,898 psi | 54% | 2707 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 88% | 29,747 psi | 43% | 2539 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,885 psi | 56% | 2697 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 55,419 psi | 80% | 2907 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,309 psi | 64% | 2825 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,488 psi | 74% | 2943 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,537 psi | 55% | 2690 fps | 97.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,258 psi | 49% | 2628 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,938 psi | 47% | 2589 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,529 psi | 41% | 2497 fps | 96.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,158 psi | 52% | 2733 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 47,572 psi | 68% | 2838 fps | 95.3% |
| Bofors RP15 | <<locked>> | 82% | 34,040 psi | 49% | 2618 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 56,434 psi | 81% | 2923 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 34,258 psi | 49% | 2657 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 34,258 psi | 49% | 2628 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 48,704 psi | 70% | 2818 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 88% | 36,187 psi | 52% | 2667 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 56,449 psi | 81% | 2949 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 47,964 psi | 69% | 2871 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 50,502 psi | 73% | 2884 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 82% | 39,175 psi | 56% | 2687 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 82% | 38,551 psi | 55% | 2674 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,756 psi | 60% | 2703 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 31,894 psi | 46% | 2638 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 47,630 psi | 68% | 2897 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,644 psi | 40% | 1670 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 56,956 psi | 82% | 2917 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,266 psi | 64% | 2753 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,285 psi | 72% | 2848 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 43,772 psi | 63% | 2759 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 38,363 psi | 55% | 2631 fps | 95.2% |
| IMR 7828 SSC | 87.7 gr | 84% | 37,768 psi | 54% | 2720 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 96% | 34,824 psi | 50% | 2690 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 57,334 psi | 82% | 2904 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 47,674 psi | 68% | 2792 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,006 psi | 66% | 2785 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 29,254 psi | 42% | 2431 fps | 96.5% |
| Norma 203B | <<locked>> | 80% | 58,421 psi | 84% | 2966 fps | 100% |
| Norma 204 | <<locked>> | 80% | 44,382 psi | 64% | 2795 fps | 98.4% |
| Norma 217 | <<locked>> | 92% | 30,269 psi | 43% | 2585 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 35,882 psi | 52% | 2697 fps | 97.8% |
| Norma URP | <<locked>> | 80% | 45,295 psi | 65% | 2805 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 37,434 psi | 54% | 2723 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 44,179 psi | 63% | 2802 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 30,879 psi | 44% | 2533 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,311 psi | 41% | 1713 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 56,101 psi | 81% | 2933 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 54,911 psi | 79% | 2982 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,209 psi | 66% | 2838 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,469 psi | 64% | 2858 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 30,995 psi | 45% | 2612 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 40,263 psi | 58% | 2831 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 59,030 psi | 85% | 2913 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 53,142 psi | 76% | 2874 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 39,813 psi | 57% | 2674 fps | 96.3% |
| Rottweil R 905 | <<locked>> | 80% | 37,826 psi | 54% | 2674 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 80% | 48,704 psi | 70% | 2818 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,674 psi | 68% | 2792 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 57,334 psi | 82% | 2904 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,006 psi | 66% | 2785 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 54,752 psi | 79% | 2933 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,200 psi | 76% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,688 psi | 67% | 2743 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,507 psi | 54% | 2671 fps | 97% |
| Somchem S355 | <<locked>> | 80% | 52,939 psi | 76% | 2867 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 40,509 psi | 58% | 2661 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 42,250 psi | 61% | 2756 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,261 psi | 55% | 2654 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 80% | 50,691 psi | 73% | 2789 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,775 psi | 67% | 2795 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,112 psi | 48% | 2526 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 80% | 58,088 psi | 83% | 2877 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 46,093 psi | 66% | 2799 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 36,941 psi | 53% | 2664 fps | 99.9% |
| Vihtavuori N560 | 89 gr | 82% | 38,827 psi | 56% | 2753 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 88% | 38,885 psi | 56% | 2740 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 94% | 41,727 psi | 60% | 2848 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,948 psi | 66% | 2753 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,964 psi | 69% | 2871 fps | 99.8% |
| Winchester StaBALL HD | 85.9 gr | 80% | 29,138 psi | 42% | 2612 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 34,983 psi | 50% | 2579 fps | 96% |
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 92 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 220gr | Peregrine Glider (Glider GRM). Accurate MAGPRO delivers the highest muzzle velocity at 3,182 fps; across all powders the maximum-charge window runs from 1,867 fps to 3,182 fps. ADI AR 2217 gives the best case fill at 100 %, and 92 of the 92 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 220.0 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 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. IMR 7828 SSC, Winchester StaBALL HD, Vihtavuori N560 rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 220gr | Peregrine Glider (Glider GRM) 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.