Load Specifications
Load data in caliber .25-35 Win. with .257 | 80gr | Impala LW CFN bullet and 12 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, Vihtavuori N130 and ReloadSwiss RS 14.
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: 20"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 92% | 40,030 psi | 90% | 2684 fps | 96.6% |
| Accurate 2495ᴾ | <<locked>> | 100% | 39,624 psi | 90% | 2743 fps | 96.8% |
| ADI AR 2207 | <<locked>> | 82% | 40,016 psi | 90% | 2680 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 94% | 38,624 psi | 87% | 2740 fps | 98.6% |
| Alliant Reloder-10x | <<locked>> | 86% | 38,043 psi | 86% | 2657 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,256 psi | 73% | 1772 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 39,914 psi | 90% | 2661 fps | 98.5% |
| Norma 200 | <<locked>> | 82% | 38,986 psi | 88% | 2657 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,285 psi | 73% | 1814 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 38,725 psi | 88% | 2615 fps | 97.1% |
| Vihtavuori N133 | <<locked>> | 92% | 38,058 psi | 86% | 2608 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 98% | 37,695 psi | 85% | 2687 fps | 96% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 20"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 88% | 35,360 psi | 80% | 2575 fps | 95.1% |
| Accurate 2495 | <<locked>> | 96% | 34,896 psi | 79% | 2638 fps | 95.3% |
| ADI AR 2207 | <<locked>> | 80% | 38,014 psi | 86% | 2638 fps | 99.7% |
| Alliant AR-Comp | 24 gr | 84% | 29,182 psi | 66% | 2480 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 32,271 psi | 73% | 2516 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,323 psi | 55% | 1591 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 33,779 psi | 76% | 2516 fps | 96.9% |
| Norma 200 | <<locked>> | 80% | 36,709 psi | 83% | 2608 fps | 97.6% |
| ReloadSwiss RS 14 | 8.1 gr | 80% | 24,091 psi | 54% | 1624 fps | 100% |
| Vihtavuori N130 | 22.9 gr | 82% | 32,880 psi | 74% | 2477 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 90% | 35,853 psi | 81% | 2556 fps | 95% |
| Vihtavuori N135 | <<locked>> | 96% | 35,882 psi | 81% | 2641 fps | 95.4% |
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 12 powders for .25-35 Win. loaded with the .257 | 80gr | Impala LW CFN. Accurate 2495 delivers the highest muzzle velocity at 2,743 fps; across all powders the maximum-charge window runs from 1,772 fps to 2,743 fps. Accurate 2495 gives the best case fill at 100 %, and 12 of the 12 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 73–90 %, leaving at least 10 % headroom. The 80.0 gr projectile in 0.257" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 2495, Hodgdon TrailBoss, ReloadSwiss RS 14 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. Alliant AR-Comp, Vihtavuori N130, ReloadSwiss RS 14 rank at the top here: for .25-35 Win. with the .257 | 80gr | Impala LW CFN 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.