Load Specifications
Load data in caliber .25-06 Ackley Improved with .257 | 133gr | Berger Elite Hunter bullet and 76 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>> | 94% | 56,246 psi | 86% | 2818 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 57,305 psi | 88% | 2848 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 57,638 psi | 88% | 2969 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 94% | 58,711 psi | 90% | 2972 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 82% | 57,914 psi | 89% | 2799 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 58,117 psi | 89% | 2904 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 94% | 55,709 psi | 85% | 2907 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,154 psi | 77% | 2808 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,701 psi | 68% | 2769 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 88% | 58,349 psi | 89% | 2900 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,448 psi | 85% | 2858 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,595 psi | 88% | 2894 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,796 psi | 85% | 2904 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 57,203 psi | 88% | 2874 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,521 psi | 87% | 2933 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,972 psi | 89% | 2966 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,435 psi | 88% | 2867 fps | 96.9% |
| Bofors RP15 | <<locked>> | 98% | 58,842 psi | 90% | 2949 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,446 psi | 80% | 2881 fps | 99% |
| Bofors RP5 | <<locked>> | 94% | 55,796 psi | 85% | 2904 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 55,985 psi | 86% | 2795 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,390 psi | 85% | 2897 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 86% | 58,958 psi | 90% | 2900 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 57,870 psi | 89% | 2858 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 92% | 55,724 psi | 85% | 2848 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 58,334 psi | 89% | 2887 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 58,363 psi | 89% | 2818 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,288 psi | 85% | 3005 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 55,869 psi | 86% | 2884 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,188 psi | 57% | 1778 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,551 psi | 88% | 2831 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,348 psi | 88% | 2815 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 57,783 psi | 89% | 2838 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,710 psi | 87% | 2831 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 96% | 57,754 psi | 88% | 2949 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 40,422 psi | 62% | 2677 fps | 96.1% |
| Lovex S065 | <<locked>> | 86% | 58,204 psi | 89% | 2815 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,275 psi | 86% | 2812 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 57,261 psi | 88% | 2831 fps | 100% |
| Norma 204 | <<locked>> | 88% | 58,624 psi | 90% | 2890 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 40,321 psi | 62% | 2700 fps | 98.3% |
| Norma MRP | <<locked>> | 92% | 55,796 psi | 85% | 2923 fps | 100% |
| Norma URP | <<locked>> | 86% | 55,738 psi | 85% | 2828 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 58,421 psi | 90% | 2966 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 88% | 58,102 psi | 89% | 2887 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,855 psi | 87% | 2900 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 57,421 psi | 88% | 2871 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,811 psi | 86% | 2897 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,246 psi | 86% | 3005 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,082 psi | 78% | 2894 fps | 97.7% |
| Rottweil R 903 | <<locked>> | 82% | 57,348 psi | 88% | 2792 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,564 psi | 85% | 2818 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 92% | 57,174 psi | 88% | 2884 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 84% | 55,985 psi | 86% | 2795 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 58,204 psi | 89% | 2815 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,275 psi | 86% | 2812 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 59,001 psi | 90% | 2851 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,840 psi | 87% | 2661 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,159 psi | 88% | 2766 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,724 psi | 87% | 2881 fps | 99.7% |
| Somchem S355 | <<locked>> | 82% | 56,971 psi | 87% | 2785 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 57,043 psi | 87% | 2812 fps | 98.6% |
| Somchem S365 | <<locked>> | 88% | 56,231 psi | 86% | 2831 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,740 psi | 88% | 2858 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 58,059 psi | 89% | 2756 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 57,377 psi | 88% | 2818 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 57,174 psi | 88% | 2835 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 56,623 psi | 87% | 2825 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,970 psi | 86% | 2854 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,593 psi | 85% | 2923 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 98% | 55,506 psi | 85% | 2904 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,388 psi | 80% | 2900 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,942 psi | 87% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,463 psi | 85% | 2848 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 55,071 psi | 84% | 2956 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,653 psi | 88% | 2851 fps | 99.7% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 35,085 psi | 54% | 2441 fps | 97.8% |
| Accurate 4350 | <<locked>> | 80% | 46,920 psi | 72% | 2690 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 40,698 psi | 62% | 2661 fps | 95.9% |
| Accurate MAGPRO | <<locked>> | 86% | 44,324 psi | 68% | 2723 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 54,549 psi | 84% | 2753 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,957 psi | 60% | 2562 fps | 96.4% |
| ADI AR 2213 | <<locked>> | 84% | 39,827 psi | 61% | 2612 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 92% | 38,363 psi | 59% | 2572 fps | 95% |
| ADI AR 2225 | <<locked>> | 90% | 32,343 psi | 50% | 2477 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,904 psi | 69% | 2694 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,735 psi | 79% | 2805 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,131 psi | 60% | 2562 fps | 96.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,925 psi | 54% | 2503 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,678 psi | 52% | 2470 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,225 psi | 45% | 2379 fps | 96.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,738 psi | 56% | 2605 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,865 psi | 78% | 2759 fps | 95.4% |
| Bofors RP15 | <<locked>> | 84% | 37,028 psi | 57% | 2549 fps | 95.8% |
| Bofors RP30 | <<locked>> | 90% | 37,246 psi | 57% | 2589 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 34,925 psi | 54% | 2503 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 49,298 psi | 76% | 2687 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 36,738 psi | 56% | 2536 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 48,486 psi | 74% | 2736 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 50,981 psi | 78% | 2749 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 42,496 psi | 65% | 2618 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,771 psi | 64% | 2602 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,424 psi | 65% | 2582 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 34,751 psi | 53% | 2572 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 48,109 psi | 74% | 2762 fps | 99.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,862 psi | 43% | 1588 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,730 psi | 69% | 2621 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,633 psi | 78% | 2710 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 44,614 psi | 68% | 2635 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 41,524 psi | 64% | 2562 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 86% | 40,901 psi | 63% | 2644 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 98% | 37,652 psi | 58% | 2612 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 48,370 psi | 74% | 2667 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 46,717 psi | 72% | 2657 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 30,081 psi | 46% | 2320 fps | 95.9% |
| Norma 204 | <<locked>> | 80% | 44,933 psi | 69% | 2664 fps | 97.9% |
| Norma 217 | <<locked>> | 94% | 33,040 psi | 51% | 2523 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 36,564 psi | 56% | 2569 fps | 97.2% |
| Norma URP | <<locked>> | 80% | 45,948 psi | 70% | 2674 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 38,043 psi | 58% | 2595 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 44,744 psi | 69% | 2671 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 33,910 psi | 52% | 2477 fps | 95.6% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,833 psi | 72% | 2710 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,962 psi | 69% | 2726 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 31,676 psi | 49% | 2484 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 43,903 psi | 67% | 2759 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 53,896 psi | 83% | 2743 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 40,321 psi | 62% | 2543 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 80% | 38,348 psi | 59% | 2546 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 80% | 49,298 psi | 76% | 2687 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,370 psi | 74% | 2667 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 46,717 psi | 72% | 2657 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 55,259 psi | 85% | 2799 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,432 psi | 82% | 2615 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,311 psi | 72% | 2615 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,043 psi | 58% | 2539 fps | 96.3% |
| Somchem S355 | <<locked>> | 80% | 53,592 psi | 82% | 2740 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 41,075 psi | 63% | 2533 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 42,888 psi | 66% | 2631 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,001 psi | 60% | 2533 fps | 97.5% |
| Vihtavuori N150 | <<locked>> | 80% | 51,343 psi | 79% | 2664 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,384 psi | 73% | 2667 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,823 psi | 52% | 2408 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 46,717 psi | 72% | 2671 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,811 psi | 58% | 2546 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 42,192 psi | 65% | 2680 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 88% | 39,595 psi | 61% | 2612 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 96% | 45,237 psi | 69% | 2772 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,398 psi | 71% | 2628 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,486 psi | 74% | 2736 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 29,921 psi | 46% | 2490 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,520 psi | 54% | 2454 fps | 95.3% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 76 powders for .25-06 Ackley Improved loaded with the .257 | 133gr | Berger Elite Hunter. Hodgdon Retumbo delivers the highest muzzle velocity at 3,005 fps; across all powders the maximum-charge window runs from 1,778 fps to 3,005 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 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 133.0 gr projectile in 0.257" calls for a 1:8.0 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.