Load Specifications
Load data in caliber .25-06 Ackley Improved with .257 | 120gr | Speer Boat-Tail bullet and 79 powders. The key underlying parameters are shown in the table above.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 58,697 psi | 90% | 2989 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,101 psi | 86% | 2972 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 56,289 psi | 86% | 3084 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 94% | 57,348 psi | 88% | 3084 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 82% | 56,971 psi | 87% | 2933 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,029 psi | 87% | 3028 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 96% | 58,740 psi | 90% | 3094 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,124 psi | 75% | 2920 fps | 97.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,845 psi | 67% | 2874 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,232 psi | 88% | 3025 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 58,552 psi | 90% | 2959 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,869 psi | 87% | 3028 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 58,305 psi | 89% | 3045 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,521 psi | 87% | 3015 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 96% | 58,668 psi | 90% | 3087 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,072 psi | 86% | 3002 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,201 psi | 85% | 3058 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,521 psi | 87% | 3091 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 56,608 psi | 87% | 2986 fps | 95.9% |
| Bofors RP15 | <<locked>> | 98% | 57,464 psi | 88% | 3068 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,430 psi | 79% | 2995 fps | 98.3% |
| Bofors RP5 | <<locked>> | 96% | 58,668 psi | 90% | 3087 fps | 99.6% |
| Bofors RP7 | <<locked>> | 86% | 58,581 psi | 90% | 2976 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,346 psi | 83% | 3015 fps | 99% |
| Hodgdon H414 | <<locked>> | 86% | 57,885 psi | 89% | 3028 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 56,884 psi | 87% | 2986 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 94% | 58,523 psi | 90% | 3025 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,276 psi | 88% | 3005 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,392 psi | 88% | 2949 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,172 psi | 83% | 3123 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 86% | 58,624 psi | 90% | 3064 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,072 psi | 57% | 1886 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,652 psi | 87% | 2959 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,376 psi | 86% | 2943 fps | 99.8% |
| IMR 4831 | <<locked>> | 88% | 56,492 psi | 87% | 2963 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,811 psi | 86% | 2953 fps | 98% |
| IMR 7828 SSC | <<locked>> | 96% | 56,420 psi | 86% | 3064 fps | 98.6% |
| Lovex S065 | <<locked>> | 86% | 57,043 psi | 87% | 2943 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 58,856 psi | 90% | 2992 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,159 psi | 86% | 2953 fps | 100% |
| Norma 204 | <<locked>> | 88% | 57,667 psi | 88% | 3015 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 39,305 psi | 60% | 2792 fps | 97.2% |
| Norma MRP | <<locked>> | 94% | 58,610 psi | 90% | 3107 fps | 100% |
| Norma URP | <<locked>> | 88% | 58,320 psi | 89% | 3012 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,334 psi | 88% | 3091 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 57,087 psi | 87% | 3012 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 55,724 psi | 85% | 3022 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,884 psi | 58% | 1929 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,769 psi | 89% | 3028 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,115 psi | 86% | 2992 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 58,740 psi | 90% | 3084 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,056 psi | 84% | 3123 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,082 psi | 77% | 2999 fps | 96.6% |
| Rottweil R 903 | <<locked>> | 82% | 56,130 psi | 86% | 2920 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 58,189 psi | 89% | 2999 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 92% | 56,101 psi | 86% | 3005 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 86% | 58,581 psi | 90% | 2976 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,043 psi | 87% | 2943 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 58,856 psi | 90% | 2992 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,711 psi | 88% | 2979 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,086 psi | 86% | 2795 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,188 psi | 86% | 2894 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,666 psi | 85% | 3002 fps | 99.3% |
| Somchem S355 | <<locked>> | 82% | 55,869 psi | 86% | 2913 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,318 psi | 86% | 2933 fps | 97.9% |
| Somchem S365 | <<locked>> | 90% | 58,900 psi | 90% | 3012 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,536 psi | 87% | 2976 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 84% | 57,014 psi | 87% | 2884 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,289 psi | 86% | 2946 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,028 psi | 86% | 2953 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 86% | 55,651 psi | 85% | 2953 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 58,276 psi | 89% | 3028 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 58,305 psi | 89% | 3100 fps | 98.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 58,073 psi | 89% | 3074 fps | 98.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,198 psi | 78% | 3009 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,854 psi | 86% | 2904 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 58,204 psi | 89% | 3031 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 98% | 57,870 psi | 89% | 3136 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,478 psi | 87% | 2969 fps | 99.3% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 34,185 psi | 52% | 2536 fps | 96.6% |
| Accurate 4350 | <<locked>> | 80% | 45,861 psi | 70% | 2802 fps | 99.9% |
| Accurate High Country | <<locked>> | 84% | 42,496 psi | 65% | 2822 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 88% | 46,296 psi | 71% | 2887 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 53,505 psi | 82% | 2881 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,145 psi | 58% | 2664 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 88% | 44,527 psi | 68% | 2835 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 96% | 42,960 psi | 66% | 2792 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 92% | 33,750 psi | 52% | 2621 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,595 psi | 59% | 2671 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 54,984 psi | 84% | 2907 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,772 psi | 67% | 2808 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,749 psi | 78% | 2933 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,232 psi | 59% | 2664 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 84% | 39,073 psi | 60% | 2720 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,706 psi | 50% | 2566 fps | 99.2% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,443 psi | 47% | 2523 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,737 psi | 55% | 2700 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,142 psi | 81% | 2923 fps | 95% |
| Bofors RP15 | <<locked>> | 86% | 38,812 psi | 59% | 2713 fps | 95.4% |
| Bofors RP30 | <<locked>> | 94% | 41,684 psi | 64% | 2805 fps | 95.8% |
| Bofors RP5 | <<locked>> | 84% | 39,073 psi | 60% | 2720 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 48,486 psi | 74% | 2808 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 92% | 41,046 psi | 63% | 2756 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 47,268 psi | 72% | 2848 fps | 99% |
| Hodgdon H4350 | <<locked>> | 80% | 49,922 psi | 76% | 2867 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 86% | 44,483 psi | 68% | 2779 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 46,717 psi | 72% | 2825 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,350 psi | 63% | 2694 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 36,158 psi | 55% | 2723 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 47,036 psi | 72% | 2874 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,804 psi | 43% | 1686 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,874 psi | 67% | 2736 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,792 psi | 76% | 2835 fps | 99.2% |
| IMR 4831 | <<locked>> | 80% | 43,395 psi | 66% | 2743 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 84% | 43,250 psi | 66% | 2720 fps | 95% |
| IMR 7828 SSC | <<locked>> | 88% | 42,917 psi | 66% | 2812 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 47,355 psi | 73% | 2782 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 45,571 psi | 70% | 2766 fps | 98.8% |
| Lovex S071 | <<locked>> | 82% | 31,430 psi | 48% | 2467 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 43,976 psi | 67% | 2772 fps | 96.9% |
| Norma 217 | <<locked>> | 96% | 34,403 psi | 53% | 2667 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 35,563 psi | 54% | 2664 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 44,744 psi | 69% | 2785 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 42,685 psi | 65% | 2818 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 43,801 psi | 67% | 2782 fps | 99% |
| Ramshot Magnum | <<locked>> | 86% | 35,447 psi | 54% | 2628 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,369 psi | 43% | 1726 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,983 psi | 83% | 2976 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,687 psi | 70% | 2822 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,005 psi | 67% | 2838 fps | 99.7% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 35,491 psi | 54% | 2700 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 46,195 psi | 71% | 2927 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 52,620 psi | 81% | 2867 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 42,192 psi | 65% | 2707 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 80% | 37,463 psi | 57% | 2648 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 48,486 psi | 74% | 2808 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,355 psi | 73% | 2782 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 45,571 psi | 70% | 2766 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 54,230 psi | 83% | 2927 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,649 psi | 81% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,398 psi | 71% | 2730 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,144 psi | 57% | 2641 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 52,446 psi | 80% | 2864 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 46,122 psi | 71% | 2756 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 41,829 psi | 64% | 2746 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,072 psi | 58% | 2631 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 80% | 50,140 psi | 77% | 2785 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,354 psi | 71% | 2785 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 37,666 psi | 58% | 2615 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 45,600 psi | 70% | 2785 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 36,695 psi | 56% | 2644 fps | 99.2% |
| Vihtavuori N560 | <<locked>> | 86% | 44,150 psi | 68% | 2844 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 92% | 44,179 psi | 68% | 2828 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 98% | 47,543 psi | 73% | 2940 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,455 psi | 70% | 2746 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,514 psi | 73% | 2854 fps | 99% |
| Winchester StaBALL HD | <<locked>> | 80% | 29,153 psi | 45% | 2575 fps | 99.3% |
| Winchester Supreme 780 | <<locked>> | 84% | 40,001 psi | 61% | 2674 fps | 95.9% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 79 powders for .25-06 Ackley Improved loaded with the .257 | 120gr | Speer Boat-Tail. Winchester StaBALL HD delivers the highest muzzle velocity at 3,136 fps; across all powders the maximum-charge window runs from 1,886 fps to 3,136 fps. ADI AR 2217 gives the best case fill at 100 %, and 79 of the 79 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (450 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 120.0 gr projectile in 0.257" calls for a 1:10.5 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.