Load Specifications
Load data in caliber .25-06 Ackley Improved with .257 | 122gr | Remington SP Extended-Range bullet and 77 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N560, ADI AR 2213 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 57,058 psi | 87% | 2946 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 58,175 psi | 89% | 2982 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 58,885 psi | 90% | 3107 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 92% | 55,811 psi | 86% | 3041 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 82% | 58,479 psi | 90% | 2936 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 58,871 psi | 90% | 3038 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 56,681 psi | 87% | 3041 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,169 psi | 78% | 2943 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,745 psi | 70% | 2897 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 55,448 psi | 85% | 2976 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 55,448 psi | 85% | 2976 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 88% | 58,958 psi | 90% | 3035 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,318 psi | 86% | 2992 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 58,581 psi | 90% | 3028 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,811 psi | 87% | 3038 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 96% | 58,378 psi | 89% | 3012 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,711 psi | 88% | 3071 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 54,853 psi | 84% | 3041 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 58,349 psi | 89% | 3002 fps | 96.7% |
| Bofors RP15 | <<locked>> | 96% | 55,985 psi | 86% | 3022 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,548 psi | 82% | 3009 fps | 98.8% |
| Bofors RP5 | <<locked>> | 94% | 56,811 psi | 87% | 3038 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 56,507 psi | 87% | 2927 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,550 psi | 87% | 3031 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 84% | 55,883 psi | 86% | 2979 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 58,407 psi | 89% | 2992 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 56,811 psi | 87% | 2986 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,579 psi | 85% | 2963 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,680 psi | 85% | 2907 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,652 psi | 87% | 3150 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 56,724 psi | 87% | 3018 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,130 psi | 57% | 1880 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 58,378 psi | 89% | 2969 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,754 psi | 88% | 2949 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 58,407 psi | 89% | 2972 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,392 psi | 88% | 2963 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 96% | 58,610 psi | 90% | 3084 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 58,827 psi | 90% | 2949 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,768 psi | 87% | 2943 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 58,334 psi | 89% | 2966 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,825 psi | 86% | 2966 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 41,379 psi | 63% | 2822 fps | 98.1% |
| Norma MRP | <<locked>> | 92% | 57,072 psi | 87% | 3064 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,289 psi | 86% | 2959 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,347 psi | 85% | 3038 fps | 99% |
| Ramshot Hunter | <<locked>> | 86% | 55,419 psi | 85% | 2969 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 58,291 psi | 89% | 3035 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,956 psi | 58% | 1923 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 58,349 psi | 89% | 3005 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,623 psi | 87% | 3031 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 57,798 psi | 89% | 3146 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 52,475 psi | 80% | 3022 fps | 97.4% |
| Rottweil R 903 | <<locked>> | 82% | 58,088 psi | 89% | 2930 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 56,289 psi | 86% | 2949 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 92% | 57,986 psi | 89% | 3015 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 56,507 psi | 87% | 2927 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 58,827 psi | 90% | 2949 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,768 psi | 87% | 2943 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,348 psi | 88% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,827 psi | 89% | 2900 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,537 psi | 88% | 3012 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 57,479 psi | 88% | 2920 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 58,088 psi | 89% | 2943 fps | 98.4% |
| Somchem S365 | <<locked>> | 88% | 57,203 psi | 88% | 2966 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 58,595 psi | 90% | 2989 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 58,827 psi | 90% | 2890 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 58,146 psi | 89% | 2953 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 58,291 psi | 89% | 2969 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 57,464 psi | 88% | 2959 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,608 psi | 87% | 2986 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,768 psi | 87% | 3058 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 98% | 56,797 psi | 87% | 3035 fps | 98.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 53,548 psi | 82% | 3031 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,870 psi | 89% | 2910 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,188 psi | 86% | 2982 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 56,536 psi | 87% | 3094 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 58,508 psi | 90% | 2982 fps | 99.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 35,534 psi | 54% | 2552 fps | 97.4% |
| Accurate 4350 | <<locked>> | 80% | 47,485 psi | 73% | 2815 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 41,220 psi | 63% | 2776 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 86% | 45,049 psi | 69% | 2844 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 55,013 psi | 84% | 2884 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 39,436 psi | 60% | 2680 fps | 95.9% |
| ADI AR 2213 | 54.2 gr | 86% | 43,207 psi | 66% | 2789 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 94% | 41,771 psi | 64% | 2753 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 90% | 32,866 psi | 50% | 2582 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,914 psi | 61% | 2684 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,914 psi | 61% | 2684 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,397 psi | 70% | 2818 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,504 psi | 80% | 2936 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,566 psi | 61% | 2677 fps | 96% |
| Alliant Reloder-22 | <<locked>> | 82% | 37,913 psi | 58% | 2674 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,069 psi | 52% | 2582 fps | 99.6% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,602 psi | 45% | 2480 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,463 psi | 57% | 2717 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 51,576 psi | 79% | 2884 fps | 95% |
| Bofors RP15 | <<locked>> | 84% | 37,666 psi | 58% | 2667 fps | 95.3% |
| Bofors RP30 | <<locked>> | 92% | 40,843 psi | 63% | 2766 fps | 95.8% |
| Bofors RP5 | <<locked>> | 82% | 37,913 psi | 58% | 2674 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 49,908 psi | 76% | 2815 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 90% | 39,972 psi | 61% | 2713 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 49,037 psi | 75% | 2861 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 51,387 psi | 79% | 2877 fps | 99% |
| Hodgdon H4831 | <<locked>> | 84% | 43,192 psi | 66% | 2736 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 45,324 psi | 69% | 2782 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,902 psi | 66% | 2700 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 37,797 psi | 58% | 2753 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 48,820 psi | 75% | 2887 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,818 psi | 43% | 1680 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,223 psi | 69% | 2743 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,169 psi | 78% | 2841 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 45,121 psi | 69% | 2756 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 44,730 psi | 69% | 2736 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 86% | 41,698 psi | 64% | 2769 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 48,733 psi | 75% | 2789 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 47,036 psi | 72% | 2779 fps | 99.2% |
| Lovex S071 | <<locked>> | 80% | 30,603 psi | 47% | 2428 fps | 95.4% |
| Norma 204 | <<locked>> | 80% | 45,382 psi | 70% | 2782 fps | 97.5% |
| Norma 217 | <<locked>> | 94% | 33,736 psi | 52% | 2631 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 36,970 psi | 57% | 2680 fps | 96.7% |
| Norma URP | <<locked>> | 80% | 46,282 psi | 71% | 2799 fps | 100% |
| Ramshot Grand | 55.5 gr | 86% | 41,452 psi | 64% | 2776 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 45,266 psi | 69% | 2792 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 84% | 34,505 psi | 53% | 2585 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,398 psi | 44% | 1719 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,529 psi | 73% | 2835 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,498 psi | 70% | 2848 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 34,534 psi | 53% | 2661 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 44,976 psi | 69% | 2881 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 54,273 psi | 83% | 2874 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 40,828 psi | 63% | 2664 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 80% | 38,856 psi | 60% | 2661 fps | 96% |
| Rottweil R 907 | <<locked>> | 80% | 49,908 psi | 76% | 2815 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,733 psi | 75% | 2789 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 47,036 psi | 72% | 2779 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,128 psi | 83% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,761 psi | 73% | 2736 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,522 psi | 59% | 2654 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 54,041 psi | 83% | 2867 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 44,512 psi | 68% | 2710 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 43,497 psi | 67% | 2753 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,407 psi | 60% | 2644 fps | 97% |
| Vihtavuori N150 | <<locked>> | 80% | 51,677 psi | 79% | 2789 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,877 psi | 73% | 2792 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 36,521 psi | 56% | 2572 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 47,297 psi | 72% | 2799 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,218 psi | 59% | 2657 fps | 99.6% |
| Vihtavuori N560 | 54.6 gr | 84% | 42,728 psi | 65% | 2795 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 90% | 43,047 psi | 66% | 2785 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 96% | 46,354 psi | 71% | 2897 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,065 psi | 72% | 2753 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,037 psi | 75% | 2861 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 30,313 psi | 46% | 2592 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,682 psi | 59% | 2625 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 77 powders for .25-06 Ackley Improved loaded with the .257 | 122gr | Remington SP Extended-Range. Hodgdon Retumbo delivers the highest muzzle velocity at 3,150 fps; across all powders the maximum-charge window runs from 1,880 fps to 3,150 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 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 122.0 gr projectile in 0.257" calls for a 1:12.5 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. Vihtavuori N560, ADI AR 2213, Ramshot Grand rank at the top here: for .25-06 Ackley Improved with the .257 | 122gr | Remington SP Extended-Range 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.