Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 200gr | Peregrine VRG-3 bullet and 99 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 7828 SSC, Vihtavuori N560 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 2700 | <<locked>> | 86% | 62,482 psi | 90% | 3110 fps | 100% |
| Accurate 3100 | <<locked>> | 98% | 61,786 psi | 89% | 3163 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 60,379 psi | 87% | 3061 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 59,030 psi | 85% | 3150 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 61,815 psi | 89% | 3291 fps | 98.6% |
| ADI APS 450 | <<locked>> | 82% | 60,829 psi | 87% | 2444 fps | 100% |
| ADI AR 2208 | <<locked>> | 84% | 59,959 psi | 86% | 3107 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 60,205 psi | 86% | 3215 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 98% | 62,279 psi | 89% | 3287 fps | 99.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,385 psi | 70% | 3045 fps | 98.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,076 psi | 62% | 2999 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 61,409 psi | 88% | 3130 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 61,438 psi | 88% | 3156 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 60,104 psi | 86% | 3209 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 61,859 psi | 89% | 3228 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 59,567 psi | 86% | 3202 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 98% | 61,960 psi | 89% | 3274 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 62,917 psi | 90% | 3225 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,592 psi | 78% | 3186 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 60,060 psi | 86% | 3278 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 59,828 psi | 86% | 3176 fps | 97.4% |
| Bofors RP15ᴾ | <<locked>> | 100% | 60,582 psi | 87% | 3255 fps | 99.9% |
| Bofors RP3 | <<locked>> | 84% | 62,700 psi | 90% | 3146 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,488 psi | 73% | 3117 fps | 98.7% |
| Bofors RP5 | <<locked>> | 98% | 61,960 psi | 89% | 3274 fps | 100% |
| Bofors RP7 | <<locked>> | 88% | 61,395 psi | 88% | 3153 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,763 psi | 71% | 3071 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 84% | 62,816 psi | 90% | 3173 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 62,381 psi | 90% | 3228 fps | 100% |
| Hodgdon H4350 | <<locked>> | 90% | 61,946 psi | 89% | 3196 fps | 99.9% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 60,959 psi | 88% | 3199 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 60,771 psi | 87% | 3199 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 60,336 psi | 87% | 3120 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 60,988 psi | 88% | 3150 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,490 psi | 77% | 3261 fps | 100% |
| Hodgdon Superformance | <<locked>> | 88% | 62,439 psi | 90% | 3258 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,898 psi | 53% | 1965 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 59,379 psi | 85% | 3094 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 62,990 psi | 90% | 3104 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 62,584 psi | 90% | 3133 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 60,858 psi | 87% | 3123 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 59,480 psi | 85% | 3136 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 86% | 59,248 psi | 85% | 3123 fps | 100% |
| IMR 4831 | <<locked>> | 94% | 60,582 psi | 87% | 3153 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 62,627 psi | 90% | 3192 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 96% | 60,147 psi | 86% | 3264 fps | 99.5% |
| Lovex S062 | <<locked>> | 82% | 59,640 psi | 86% | 3074 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 59,698 psi | 86% | 3114 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 61,670 psi | 89% | 3166 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,882 psi | 79% | 3068 fps | 100% |
| Norma 203B | <<locked>> | 82% | 60,727 psi | 87% | 3140 fps | 100% |
| Norma 204 | <<locked>> | 90% | 60,930 psi | 88% | 3202 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 38,363 psi | 55% | 2913 fps | 97.8% |
| Norma MRP | <<locked>> | 96% | 62,192 psi | 89% | 3301 fps | 100% |
| Norma URP | <<locked>> | 90% | 61,235 psi | 88% | 3186 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 62,381 psi | 90% | 3169 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 60,350 psi | 87% | 3274 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 90% | 60,191 psi | 86% | 3196 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 62,149 psi | 89% | 3245 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,652 psi | 54% | 2014 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 62,482 psi | 90% | 3159 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 61,395 psi | 88% | 3209 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 59,219 psi | 85% | 3173 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 62,221 psi | 89% | 3268 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,331 psi | 78% | 3255 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 49,168 psi | 71% | 3127 fps | 97.3% |
| Rottweil R 902 | <<locked>> | 82% | 61,322 psi | 88% | 3084 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 62,917 psi | 90% | 3143 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 61,264 psi | 88% | 3179 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 94% | 59,016 psi | 85% | 3189 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 88% | 61,395 psi | 88% | 3153 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 88% | 59,698 psi | 86% | 3114 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 59,640 psi | 86% | 3074 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 61,670 psi | 89% | 3166 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 60,858 psi | 87% | 3156 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 62,613 psi | 90% | 2999 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 59,263 psi | 85% | 3068 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 62,743 psi | 90% | 3245 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 62,337 psi | 90% | 3136 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 59,321 psi | 85% | 3110 fps | 98.9% |
| Somchem S365 | <<locked>> | 92% | 62,004 psi | 89% | 3182 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 59,495 psi | 85% | 3156 fps | 100% |
| Unknown powder | <<locked>> | 88% | 61,598 psi | 88% | 3192 fps | 100% |
| Vihtavuori N133 | <<locked>> | 82% | 61,148 psi | 88% | 2972 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 62,308 psi | 90% | 3028 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 61,569 psi | 88% | 3041 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 60,510 psi | 87% | 3061 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 62,149 psi | 89% | 3153 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 61,032 psi | 88% | 3159 fps | 100% |
| Vihtavuori N540 | <<locked>> | 82% | 61,351 psi | 88% | 3071 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 62,598 psi | 90% | 3205 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 61,090 psi | 88% | 3202 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 62,294 psi | 89% | 3310 fps | 99.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 57,276 psi | 82% | 3205 fps | 99.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 50,314 psi | 72% | 3136 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 59,205 psi | 85% | 3074 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 62,381 psi | 90% | 3228 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 61,583 psi | 88% | 3323 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 61,801 psi | 89% | 3182 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 2700 | <<locked>> | 80% | 51,097 psi | 73% | 2940 fps | 99.4% |
| Accurate 3100 | <<locked>> | 80% | 32,880 psi | 47% | 2635 fps | 97% |
| Accurate 4064 | <<locked>> | 80% | 56,507 psi | 81% | 3009 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 44,512 psi | 64% | 2913 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 46,209 psi | 66% | 3018 fps | 95.5% |
| ADI APS 450 | <<locked>> | 80% | 58,856 psi | 85% | 2415 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 52,895 psi | 76% | 3002 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 37,362 psi | 54% | 2782 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 86% | 40,857 psi | 59% | 2894 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 94% | 39,392 psi | 57% | 2848 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 92% | 32,909 psi | 47% | 2740 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 54,012 psi | 78% | 3025 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 57,537 psi | 83% | 3100 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,975 psi | 62% | 2927 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,821 psi | 72% | 3051 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 37,289 psi | 54% | 2776 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 82% | 35,520 psi | 51% | 2772 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,691 psi | 46% | 2671 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 27,659 psi | 40% | 2566 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 34,751 psi | 50% | 2812 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 52,663 psi | 76% | 3051 fps | 95.8% |
| Bofors RP15 | <<locked>> | 84% | 35,302 psi | 51% | 2766 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 54,911 psi | 79% | 3038 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 37,956 psi | 55% | 2861 fps | 95.5% |
| Bofors RP5 | <<locked>> | 82% | 35,520 psi | 51% | 2772 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 47,514 psi | 68% | 2923 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 92% | 37,724 psi | 54% | 2812 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 54,998 psi | 79% | 3061 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 50,575 psi | 73% | 3045 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 45,005 psi | 65% | 2907 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 90% | 43,743 psi | 63% | 2900 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 86% | 42,902 psi | 62% | 2884 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,364 psi | 58% | 2802 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 57,043 psi | 82% | 3097 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 35,331 psi | 51% | 2848 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 46,122 psi | 66% | 2992 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,557 psi | 40% | 1762 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 55,753 psi | 80% | 3041 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 59,205 psi | 85% | 3054 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,880 psi | 75% | 2976 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,633 psi | 73% | 2959 fps | 99.7% |
| IMR 4350 | <<locked>> | 80% | 43,134 psi | 62% | 2851 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,052 psi | 70% | 2953 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 38,537 psi | 55% | 2776 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 84% | 42,598 psi | 61% | 2841 fps | 95.7% |
| IMR 7828 SSC | 93.4 gr | 84% | 39,088 psi | 56% | 2864 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 56,014 psi | 80% | 3025 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 46,354 psi | 67% | 2897 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 44,730 psi | 64% | 2884 fps | 99.2% |
| Lovex S071 | <<locked>> | 82% | 30,168 psi | 43% | 2562 fps | 95.9% |
| Norma 203B | <<locked>> | 80% | 56,869 psi | 82% | 3084 fps | 100% |
| Norma 204 | <<locked>> | 80% | 43,149 psi | 62% | 2890 fps | 97.4% |
| Norma 217 | <<locked>> | 96% | 33,460 psi | 48% | 2782 fps | 95.9% |
| Norma MRP | 90.4 gr | 80% | 34,577 psi | 50% | 2776 fps | 96.5% |
| Norma URP | <<locked>> | 80% | 43,947 psi | 63% | 2907 fps | 100% |
| Ramshot Big Game | <<locked>> | 80% | 58,247 psi | 84% | 3114 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 37,811 psi | 54% | 2844 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 42,902 psi | 62% | 2900 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 82% | 32,837 psi | 47% | 2690 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,166 psi | 40% | 1804 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 54,737 psi | 79% | 3048 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,069 psi | 76% | 3097 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,715 psi | 64% | 2936 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,105 psi | 62% | 2959 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 32,184 psi | 46% | 2746 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 42,047 psi | 60% | 2979 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 57,580 psi | 83% | 3031 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 51,648 psi | 74% | 2986 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 38,682 psi | 56% | 2762 fps | 95% |
| Rottweil R 905 | <<locked>> | 80% | 36,550 psi | 53% | 2759 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 47,514 psi | 68% | 2923 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,354 psi | 67% | 2897 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 56,014 psi | 80% | 3025 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 44,730 psi | 64% | 2884 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,330 psi | 77% | 3048 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,866 psi | 75% | 2858 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,411 psi | 65% | 2841 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 36,230 psi | 52% | 2753 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 51,430 psi | 74% | 2979 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 42,221 psi | 61% | 2808 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 40,872 psi | 59% | 2858 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,086 psi | 53% | 2743 fps | 96.8% |
| Unknown powder | <<locked>> | 80% | 47,094 psi | 68% | 2963 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 57,595 psi | 83% | 2927 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 58,407 psi | 84% | 2979 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 57,682 psi | 83% | 2989 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,179 psi | 63% | 2815 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,282 psi | 68% | 2930 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 33,228 psi | 48% | 2638 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 57,537 psi | 83% | 3022 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 47,863 psi | 69% | 2979 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 35,520 psi | 51% | 2749 fps | 99.4% |
| Vihtavuori N560 | 95.1 gr | 86% | 40,930 psi | 59% | 2917 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 90% | 40,263 psi | 58% | 2884 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 98% | 46,673 psi | 67% | 3064 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,614 psi | 64% | 2854 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,575 psi | 73% | 3045 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 28,108 psi | 40% | 2680 fps | 99.6% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,927 psi | 53% | 2733 fps | 95.8% |
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 104 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 200gr | Peregrine VRG-3. Winchester StaBALL HD delivers the highest muzzle velocity at 3,323 fps; across all powders the maximum-charge window runs from 1,965 fps to 3,323 fps. ADI AR 2217 gives the best case fill at 100 %, and 104 of the 104 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 200.0 gr projectile in 0.338" calls for a 1:15.5 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. IMR 7828 SSC, Vihtavuori N560, Norma MRP rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 200gr | Peregrine VRG-3 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 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.