Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 206gr | Peregrine VLR5 (VLR-5) bullet and 100 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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Max Load - Barrel Length: 27"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 62,453 psi | 90% | 2982 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 59,582 psi | 86% | 3035 fps | 99.9% |
| Accurate 3100 | <<locked>> | 98% | 60,191 psi | 86% | 3097 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 59,263 psi | 85% | 2999 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 61,728 psi | 89% | 3136 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 62,337 psi | 90% | 3274 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 96% | 59,088 psi | 85% | 3212 fps | 98.8% |
| ADI APS 450 | <<locked>> | 84% | 62,787 psi | 90% | 2418 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 62,613 psi | 90% | 3094 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 62,975 psi | 90% | 3205 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 98% | 60,553 psi | 87% | 3215 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,181 psi | 68% | 2976 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,858 psi | 60% | 2933 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 59,001 psi | 85% | 3143 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 60,307 psi | 87% | 3064 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 60,292 psi | 87% | 3091 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 62,743 psi | 90% | 3196 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 60,263 psi | 87% | 3159 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 62,192 psi | 89% | 3192 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 98% | 60,220 psi | 87% | 3205 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 61,409 psi | 88% | 3159 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,910 psi | 76% | 3114 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 62,787 psi | 90% | 3271 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 62,468 psi | 90% | 3169 fps | 97.8% |
| Bofors RP15ᴾ | <<locked>> | 100% | 59,059 psi | 85% | 3186 fps | 99.8% |
| Bofors RP3 | <<locked>> | 84% | 61,453 psi | 88% | 3081 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,892 psi | 70% | 3048 fps | 98.5% |
| Bofors RP5 | <<locked>> | 98% | 60,220 psi | 87% | 3205 fps | 99.9% |
| Bofors RP7 | <<locked>> | 88% | 60,394 psi | 87% | 3087 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,054 psi | 75% | 3068 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 84% | 61,728 psi | 89% | 3110 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 59,669 psi | 86% | 3143 fps | 100% |
| Hodgdon H4350 | <<locked>> | 88% | 62,540 psi | 90% | 3156 fps | 100% |
| Hodgdon H4831 | <<locked>> | 96% | 60,568 psi | 87% | 3146 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 59,205 psi | 85% | 3127 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 62,975 psi | 90% | 3104 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,953 psi | 75% | 3186 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 60,988 psi | 88% | 3192 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,796 psi | 53% | 1923 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 62,975 psi | 90% | 3091 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 61,989 psi | 89% | 3074 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 60,597 psi | 87% | 3068 fps | 100% |
| IMR 4350 | <<locked>> | 92% | 62,149 psi | 89% | 3127 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 88% | 62,091 psi | 89% | 3114 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 62,004 psi | 89% | 3123 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 61,888 psi | 89% | 3117 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 61,293 psi | 88% | 3127 fps | 99.2% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 62,468 psi | 90% | 3251 fps | 99.7% |
| Lovex S060 | <<locked>> | 82% | 62,932 psi | 90% | 3048 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 62,294 psi | 89% | 3061 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 62,395 psi | 90% | 3104 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 60,423 psi | 87% | 3100 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,519 psi | 77% | 3002 fps | 100% |
| Norma 203B | <<locked>> | 82% | 59,582 psi | 86% | 3074 fps | 100% |
| Norma 204 | <<locked>> | 90% | 59,712 psi | 86% | 3136 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 37,130 psi | 53% | 2844 fps | 97.5% |
| Norma MRP | <<locked>> | 96% | 60,394 psi | 87% | 3228 fps | 100% |
| Norma URP | <<locked>> | 90% | 59,944 psi | 86% | 3120 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 61,177 psi | 88% | 3104 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 59,234 psi | 85% | 3212 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 92% | 62,932 psi | 90% | 3182 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 57,508 psi | 83% | 3136 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,579 psi | 54% | 1969 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 61,380 psi | 88% | 3094 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 59,988 psi | 86% | 3146 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 62,062 psi | 89% | 3163 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 60,626 psi | 87% | 3202 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 52,605 psi | 76% | 3182 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 47,384 psi | 68% | 3054 fps | 96.9% |
| Rottweil R 902 | <<locked>> | 82% | 60,423 psi | 87% | 3022 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 61,714 psi | 89% | 3077 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 60,046 psi | 86% | 3114 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 96% | 61,627 psi | 89% | 3179 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 88% | 60,394 psi | 87% | 3087 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 90% | 62,395 psi | 90% | 3104 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 62,294 psi | 89% | 3061 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 60,423 psi | 87% | 3100 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 59,611 psi | 86% | 3091 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 61,540 psi | 88% | 2936 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 62,018 psi | 89% | 3054 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 61,148 psi | 88% | 3173 fps | 99.9% |
| Somchem S355 | <<locked>> | 86% | 61,148 psi | 88% | 3071 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 62,018 psi | 89% | 3100 fps | 99.2% |
| Somchem S365 | <<locked>> | 92% | 60,466 psi | 87% | 3117 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 62,004 psi | 89% | 3143 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 61,206 psi | 88% | 2966 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 61,337 psi | 88% | 2986 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 62,729 psi | 90% | 3038 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 61,975 psi | 89% | 3107 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 61,714 psi | 89% | 3120 fps | 100% |
| Vihtavuori N540 | <<locked>> | 82% | 59,495 psi | 85% | 2986 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 61,134 psi | 88% | 3117 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 59,538 psi | 86% | 3136 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 60,234 psi | 87% | 3228 fps | 99.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 55,579 psi | 80% | 3133 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 48,675 psi | 70% | 3064 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 62,076 psi | 89% | 3061 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 59,857 psi | 86% | 3146 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 59,466 psi | 85% | 3251 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 62,801 psi | 90% | 3146 fps | 99.9% |
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 2495 | <<locked>> | 80% | 58,334 psi | 84% | 2933 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 55,637 psi | 80% | 2979 fps | 99.8% |
| Accurate 3100 | <<locked>> | 80% | 32,039 psi | 46% | 2579 fps | 96.8% |
| Accurate 4064 | <<locked>> | 80% | 55,477 psi | 80% | 2946 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 43,468 psi | 62% | 2851 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 40,524 psi | 58% | 2881 fps | 96% |
| Accurate MAGPRO | 97.2 gr | 88% | 44,222 psi | 64% | 2946 fps | 95.7% |
| ADI APS 450 | <<locked>> | 80% | 58,871 psi | 85% | 2362 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 51,982 psi | 75% | 2940 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 36,564 psi | 53% | 2723 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 86% | 39,929 psi | 57% | 2828 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 94% | 38,363 psi | 55% | 2782 fps | 95% |
| ADI AR 2225 | <<locked>> | 92% | 32,010 psi | 46% | 2674 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 36,796 psi | 53% | 2723 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,069 psi | 76% | 2963 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 56,478 psi | 81% | 3038 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,047 psi | 60% | 2867 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,617 psi | 70% | 2989 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 36,463 psi | 52% | 2717 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 82% | 34,548 psi | 50% | 2710 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,922 psi | 44% | 2615 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 82% | 28,805 psi | 41% | 2572 fps | 96.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,794 psi | 49% | 2753 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 51,648 psi | 74% | 2989 fps | 95.6% |
| Bofors RP15 | <<locked>> | 86% | 36,840 psi | 53% | 2766 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 53,737 psi | 77% | 2976 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 36,898 psi | 53% | 2795 fps | 95.2% |
| Bofors RP5 | <<locked>> | 82% | 34,548 psi | 50% | 2710 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 46,688 psi | 67% | 2861 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 36,666 psi | 53% | 2743 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 53,896 psi | 77% | 2999 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,484 psi | 65% | 2907 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 48,138 psi | 69% | 2923 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 42,728 psi | 61% | 2838 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 41,901 psi | 60% | 2818 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,450 psi | 57% | 2743 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 34,418 psi | 49% | 2782 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 45,049 psi | 65% | 2930 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,485 psi | 39% | 1719 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 59,234 psi | 85% | 3041 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 54,708 psi | 79% | 2972 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 56,840 psi | 82% | 3012 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,279 psi | 61% | 2792 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,138 psi | 69% | 2890 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 41,582 psi | 60% | 2799 fps | 99.9% |
| IMR 4895 | <<locked>> | 80% | 57,972 psi | 83% | 3064 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 41,713 psi | 60% | 2779 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 88% | 41,017 psi | 59% | 2867 fps | 95.9% |
| Lovex S060 | <<locked>> | 80% | 59,234 psi | 85% | 2999 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 55,042 psi | 79% | 2963 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 45,527 psi | 65% | 2835 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 43,816 psi | 63% | 2825 fps | 99.1% |
| Lovex S071 | <<locked>> | 82% | 29,385 psi | 42% | 2507 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 55,811 psi | 80% | 3022 fps | 100% |
| Norma 204 | <<locked>> | 80% | 42,090 psi | 60% | 2825 fps | 97.2% |
| Norma 217 | <<locked>> | 96% | 32,372 psi | 47% | 2717 fps | 95.5% |
| Norma MRP | 86.7 gr | 80% | 33,649 psi | 48% | 2717 fps | 96.3% |
| Norma URP | <<locked>> | 80% | 42,931 psi | 62% | 2844 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 80% | 57,145 psi | 82% | 3051 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 37,927 psi | 54% | 2808 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 41,829 psi | 60% | 2838 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 33,620 psi | 48% | 2677 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,123 psi | 40% | 1762 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,809 psi | 77% | 2986 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,677 psi | 74% | 3031 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,613 psi | 63% | 2874 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,076 psi | 60% | 2897 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 31,357 psi | 45% | 2687 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 43,888 psi | 63% | 2982 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 56,594 psi | 81% | 2969 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 50,560 psi | 73% | 2923 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 40,524 psi | 58% | 2762 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 35,679 psi | 51% | 2700 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 46,688 psi | 67% | 2861 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,527 psi | 65% | 2835 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 55,042 psi | 79% | 2963 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,816 psi | 63% | 2825 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,141 psi | 75% | 2982 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,039 psi | 73% | 2799 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,585 psi | 64% | 2779 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 35,360 psi | 51% | 2694 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 50,517 psi | 73% | 2920 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 41,350 psi | 59% | 2749 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 39,827 psi | 57% | 2795 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,172 psi | 52% | 2680 fps | 96.6% |
| Vihtavuori N135 | <<locked>> | 80% | 57,421 psi | 82% | 2920 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 57,464 psi | 83% | 2936 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 48,370 psi | 69% | 2838 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,411 psi | 64% | 2838 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 33,504 psi | 48% | 2605 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 55,637 psi | 80% | 2933 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 43,758 psi | 63% | 2841 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 34,664 psi | 50% | 2694 fps | 99.3% |
| Vihtavuori N560 | 93.3 gr | 86% | 42,250 psi | 61% | 2904 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 90% | 39,175 psi | 56% | 2818 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 98% | 45,208 psi | 65% | 2995 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,700 psi | 63% | 2799 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,629 psi | 66% | 2910 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,325 psi | 39% | 2618 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 35,520 psi | 51% | 2661 fps | 95.3% |
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 100 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 206gr | Peregrine VLR5 (VLR-5). Accurate High Country delivers the highest muzzle velocity at 3,274 fps; across all powders the maximum-charge window runs from 1,923 fps to 3,274 fps. ADI AR 2217 gives the best case fill at 100 %, and 100 of the 100 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 206.0 gr projectile in 0.338" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-23 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 | 206gr | Peregrine VLR5 (VLR-5) 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.