Load Specifications
Load data in caliber .338 Lapua Mag. Ackley Improved with .338 | 180gr | Ferrobull Entox Sport bullet and 103 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Alliant Reloder-26 and Ramshot Grand.
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 2495 | <<locked>> | 82% | 61,264 psi | 88% | 3169 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 60,437 psi | 87% | 3225 fps | 99.8% |
| Accurate 3100 | <<locked>> | 98% | 59,350 psi | 85% | 3274 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 61,975 psi | 89% | 3235 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 60,713 psi | 87% | 3323 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 59,176 psi | 85% | 3386 fps | 97.5% |
| ADI APS 450 | <<locked>> | 84% | 62,787 psi | 90% | 2605 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 61,786 psi | 89% | 3284 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 62,120 psi | 89% | 3389 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 98% | 59,814 psi | 86% | 3389 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,456 psi | 67% | 3127 fps | 96.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,278 psi | 59% | 3077 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 59,408 psi | 85% | 3255 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 59,480 psi | 85% | 3281 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 61,743 psi | 89% | 3386 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 59,422 psi | 85% | 3346 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 61,366 psi | 88% | 3369 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 59,408 psi | 85% | 3379 fps | 99.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 60,365 psi | 87% | 3340 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,127 psi | 75% | 3284 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 61,830 psi | 89% | 3451 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 61,917 psi | 89% | 3337 fps | 96.9% |
| Bofors RP15ᴾ | <<locked>> | 100% | 58,160 psi | 84% | 3356 fps | 99.4% |
| Bofors RP3 | <<locked>> | 84% | 60,553 psi | 87% | 3271 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,182 psi | 69% | 3205 fps | 97.6% |
| Bofors RP5 | <<locked>> | 98% | 59,408 psi | 85% | 3379 fps | 99.6% |
| Bofors RP7 | <<locked>> | 88% | 59,538 psi | 86% | 3271 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,732 psi | 69% | 3159 fps | 97.7% |
| Hodgdon H380 | <<locked>> | 84% | 60,698 psi | 87% | 3297 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 60,089 psi | 86% | 3346 fps | 100% |
| Hodgdon H4350 | <<locked>> | 90% | 59,872 psi | 86% | 3314 fps | 99.6% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 58,784 psi | 84% | 3307 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 62,714 psi | 90% | 3366 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 62,018 psi | 89% | 3291 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 62,845 psi | 90% | 3330 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,169 psi | 74% | 3350 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 88% | 60,017 psi | 86% | 3369 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,637 psi | 53% | 2077 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 61,192 psi | 88% | 3271 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 60,756 psi | 87% | 3232 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 60,597 psi | 87% | 3258 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 62,729 psi | 90% | 3297 fps | 100% |
| IMR 4350 | <<locked>> | 92% | 61,293 psi | 88% | 3304 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 88% | 61,148 psi | 88% | 3294 fps | 100% |
| IMR 4831 | <<locked>> | 96% | 62,134 psi | 89% | 3323 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 61,032 psi | 88% | 3310 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 60,611 psi | 87% | 3301 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 98% | 62,018 psi | 89% | 3435 fps | 99.3% |
| Lovex S060 | <<locked>> | 82% | 62,004 psi | 89% | 3241 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 61,380 psi | 88% | 3251 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 61,496 psi | 88% | 3287 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 59,538 psi | 86% | 3281 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,707 psi | 76% | 3173 fps | 99.9% |
| Norma 201 | <<locked>> | 82% | 62,366 psi | 90% | 3261 fps | 100% |
| Norma 203B | <<locked>> | 84% | 62,613 psi | 90% | 3320 fps | 100% |
| Norma 204 | <<locked>> | 92% | 62,990 psi | 90% | 3376 fps | 99.7% |
| Norma MRP | <<locked>> | 96% | 59,596 psi | 86% | 3409 fps | 100% |
| Norma URP | <<locked>> | 90% | 58,958 psi | 85% | 3304 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 60,292 psi | 87% | 3291 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 62,584 psi | 90% | 3448 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 92% | 62,018 psi | 89% | 3369 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 59,248 psi | 85% | 3343 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,449 psi | 54% | 2126 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 60,553 psi | 87% | 3281 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 58,798 psi | 84% | 3333 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 61,192 psi | 88% | 3350 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 59,669 psi | 86% | 3383 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,982 psi | 75% | 3346 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 82% | 59,350 psi | 85% | 3209 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 60,771 psi | 87% | 3268 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 59,161 psi | 85% | 3287 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 96% | 60,640 psi | 87% | 3356 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 88% | 59,538 psi | 86% | 3271 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 90% | 61,496 psi | 88% | 3287 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 61,380 psi | 88% | 3251 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 59,538 psi | 86% | 3281 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 62,874 psi | 90% | 3333 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 62,946 psi | 90% | 3301 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 62,729 psi | 90% | 3176 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 60,713 psi | 87% | 3127 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 61,380 psi | 88% | 3241 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 60,162 psi | 86% | 3350 fps | 99.6% |
| Somchem S335 | <<locked>> | 82% | 62,497 psi | 90% | 3166 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 60,205 psi | 86% | 3258 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 61,424 psi | 88% | 3278 fps | 98.6% |
| Somchem S365 | <<locked>> | 92% | 59,408 psi | 85% | 3301 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 61,192 psi | 88% | 3323 fps | 99.9% |
| Unknown powder | <<locked>> | 88% | 59,379 psi | 85% | 3310 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 62,932 psi | 90% | 3146 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 60,104 psi | 86% | 3156 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 59,480 psi | 85% | 3166 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 62,236 psi | 89% | 3235 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 59,814 psi | 86% | 3271 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 58,682 psi | 84% | 3261 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 82% | 59,451 psi | 85% | 3196 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 60,263 psi | 87% | 3323 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 62,743 psi | 90% | 3373 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 59,828 psi | 86% | 3412 fps | 98.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,824 psi | 79% | 3301 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 61,293 psi | 88% | 3245 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 60,089 psi | 86% | 3346 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 58,305 psi | 84% | 3432 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 59,596 psi | 86% | 3291 fps | 99.5% |
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% | 57,493 psi | 83% | 3120 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,385 psi | 71% | 3045 fps | 98.7% |
| Accurate 3100 | <<locked>> | 80% | 31,328 psi | 45% | 2710 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 54,621 psi | 78% | 3133 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 42,627 psi | 61% | 3012 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 94% | 51,213 psi | 74% | 3245 fps | 95.8% |
| ADI APS 450 | <<locked>> | 80% | 58,798 psi | 84% | 2546 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 51,213 psi | 74% | 3120 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 38,334 psi | 55% | 2930 fps | 95% |
| ADI AR 2213 | <<locked>> | 90% | 45,136 psi | 65% | 3117 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 98% | 43,352 psi | 62% | 3058 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 94% | 33,663 psi | 48% | 2864 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,069 psi | 75% | 3140 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 55,637 psi | 80% | 3222 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,176 psi | 59% | 3028 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,659 psi | 68% | 3159 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 38,392 psi | 55% | 2927 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 86% | 39,059 psi | 56% | 2982 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,298 psi | 44% | 2753 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 30,269 psi | 43% | 2766 fps | 95.4% |
| Alliant Reloder-26 | 96.5 gr | 80% | 32,967 psi | 47% | 2887 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 54,404 psi | 78% | 3212 fps | 95.2% |
| Bofors RP15 | <<locked>> | 88% | 38,653 psi | 56% | 2969 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 52,924 psi | 76% | 3156 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 41,713 psi | 60% | 3071 fps | 95.8% |
| Bofors RP5 | <<locked>> | 86% | 39,059 psi | 56% | 2982 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 45,847 psi | 66% | 3025 fps | 98.2% |
| Hodgdon H1000 | <<locked>> | 96% | 41,568 psi | 60% | 3022 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 53,156 psi | 76% | 3179 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 48,660 psi | 70% | 3150 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 80% | 43,468 psi | 62% | 3009 fps | 97% |
| Hodgdon H4831 | <<locked>> | 92% | 44,976 psi | 65% | 3054 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 44,280 psi | 64% | 3038 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,667 psi | 56% | 2900 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 55,100 psi | 79% | 3219 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 38,711 psi | 56% | 3058 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 44,222 psi | 64% | 3087 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,412 psi | 39% | 1864 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,998 psi | 78% | 3166 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 57,000 psi | 82% | 3182 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,154 psi | 72% | 3091 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,965 psi | 70% | 3068 fps | 99.1% |
| IMR 4350 | <<locked>> | 80% | 41,481 psi | 60% | 2946 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,384 psi | 68% | 3058 fps | 98.8% |
| IMR 4831 | <<locked>> | 80% | 36,854 psi | 53% | 2864 fps | 98.8% |
| IMR 4895 | <<locked>> | 80% | 57,101 psi | 82% | 3251 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 43,816 psi | 63% | 2992 fps | 95% |
| IMR 7828 SSC | <<locked>> | 88% | 43,279 psi | 62% | 3084 fps | 95.4% |
| Lovex S060 | <<locked>> | 80% | 58,407 psi | 84% | 3189 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 54,143 psi | 78% | 3146 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,846 psi | 64% | 3002 fps | 99.3% |
| Lovex S070 | <<locked>> | 80% | 43,047 psi | 62% | 2982 fps | 98.3% |
| Lovex S071 | <<locked>> | 84% | 30,748 psi | 44% | 2694 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 58,682 psi | 84% | 3209 fps | 100% |
| Norma 203B | <<locked>> | 80% | 54,955 psi | 79% | 3205 fps | 100% |
| Norma 204 | <<locked>> | 80% | 41,336 psi | 59% | 2979 fps | 95.9% |
| Norma MRP | 96.1 gr | 82% | 35,563 psi | 51% | 2923 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 42,090 psi | 60% | 3005 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 80% | 56,217 psi | 81% | 3232 fps | 100% |
| Ramshot Grand | 103.9 gr | 86% | 42,206 psi | 61% | 3071 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 41,060 psi | 59% | 2992 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 86% | 36,564 psi | 53% | 2904 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,847 psi | 40% | 1906 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,924 psi | 76% | 3159 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,633 psi | 73% | 3212 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,728 psi | 61% | 3035 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,263 psi | 59% | 3051 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 35,636 psi | 51% | 2959 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 55,811 psi | 80% | 3156 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 49,661 psi | 71% | 3097 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 42,627 psi | 61% | 2976 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 84% | 40,205 psi | 58% | 2972 fps | 96% |
| Rottweil R 907 | <<locked>> | 80% | 45,847 psi | 66% | 3025 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,846 psi | 64% | 3002 fps | 99.3% |
| Shooters World Precision | <<locked>> | 80% | 54,143 psi | 78% | 3146 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,047 psi | 62% | 2982 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,285 psi | 74% | 3159 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 58,813 psi | 84% | 3241 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 58,929 psi | 85% | 3127 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,212 psi | 72% | 2979 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,903 psi | 63% | 2940 fps | 98.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 39,856 psi | 57% | 2966 fps | 95.9% |
| Somchem S335 | <<locked>> | 80% | 58,900 psi | 85% | 3120 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 49,792 psi | 72% | 3097 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 46,615 psi | 67% | 3022 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 38,841 psi | 56% | 2953 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,505 psi | 51% | 2822 fps | 95.2% |
| Unknown powder | <<locked>> | 80% | 45,281 psi | 65% | 3068 fps | 99.6% |
| Vihtavuori N133 | <<locked>> | 80% | 55,840 psi | 80% | 3054 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 56,420 psi | 81% | 3107 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 55,796 psi | 80% | 3114 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,554 psi | 61% | 2923 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,527 psi | 65% | 3035 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 86% | 36,550 psi | 53% | 2838 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 55,695 psi | 80% | 3143 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 46,093 psi | 66% | 3084 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 33,808 psi | 49% | 2835 fps | 98.4% |
| Vihtavuori N560 | <<locked>> | 90% | 45,107 psi | 65% | 3140 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 94% | 44,338 psi | 64% | 3097 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,830 psi | 62% | 2959 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,660 psi | 70% | 3150 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,701 psi | 38% | 2733 fps | 98.1% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,189 psi | 55% | 2887 fps | 95.1% |
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 108 powders for .338 Lapua Mag. Ackley Improved loaded with the .338 | 180gr | Ferrobull Entox Sport. Alliant Reloder-26 delivers the highest muzzle velocity at 3,451 fps; across all powders the maximum-charge window runs from 2,077 fps to 3,451 fps. ADI AR 2217 gives the best case fill at 100 %, and 108 of the 108 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (480 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.338" calls for a 1:15.0 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. Norma MRP, Alliant Reloder-26, Ramshot Grand rank at the top here: for .338 Lapua Mag. Ackley Improved with the .338 | 180gr | Ferrobull Entox Sport they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, Vihtavuori N570 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.