Load Specifications
Load data in caliber .25-35 Win. with .257 | 87gr | Hornady SP bullet and 16 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, Accurate 2015 and Vihtavuori N133.
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% | 38,783 psi | 88% | 2579 fps | 97.3% |
| Accurate 2495ᴾ | <<locked>> | 100% | 37,884 psi | 86% | 2631 fps | 97.4% |
| Accurate LT-30 | <<locked>> | 84% | 39,914 psi | 90% | 2513 fps | 96% |
| ADI AR 2207 | <<locked>> | 82% | 39,392 psi | 89% | 2579 fps | 100% |
| Alliant AR-Comp | <<locked>> | 94% | 37,768 psi | 85% | 2644 fps | 99.2% |
| Alliant Reloder-10x | <<locked>> | 88% | 39,349 psi | 89% | 2608 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,010 psi | 72% | 1703 fps | 100% |
| IMR 3031 | <<locked>> | 96% | 38,508 psi | 87% | 2661 fps | 96.1% |
| IMR 4198 | <<locked>> | 86% | 39,160 psi | 89% | 2562 fps | 99.1% |
| Norma 200 | <<locked>> | 84% | 39,581 psi | 89% | 2595 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,879 psi | 72% | 1742 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 37,753 psi | 85% | 2562 fps | 96.1% |
| Vihtavuori N120 | <<locked>> | 82% | 39,537 psi | 89% | 2546 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 38,072 psi | 86% | 2523 fps | 97.9% |
| Vihtavuori N133 | <<locked>> | 94% | 39,291 psi | 89% | 2559 fps | 97.2% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 39,334 psi | 89% | 2644 fps | 97.6% |
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 | 24.1 gr | 86% | 32,024 psi | 72% | 2425 fps | 95% |
| Accurate 2495 | <<locked>> | 96% | 32,822 psi | 74% | 2520 fps | 95.8% |
| Accurate LT-30 | <<locked>> | 82% | 37,405 psi | 85% | 2461 fps | 95.2% |
| ADI AR 2207 | <<locked>> | 80% | 36,796 psi | 83% | 2526 fps | 99.9% |
| Alliant AR-Comp | 23.8 gr | 84% | 27,731 psi | 63% | 2379 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 30,705 psi | 69% | 2405 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,467 psi | 53% | 1519 fps | 100% |
| IMR 3031 | <<locked>> | 94% | 36,071 psi | 82% | 2605 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 32,750 psi | 74% | 2415 fps | 97.5% |
| Norma 200 | <<locked>> | 80% | 34,664 psi | 78% | 2490 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,119 psi | 52% | 1549 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 35,679 psi | 81% | 2513 fps | 95.4% |
| Vihtavuori N120 | <<locked>> | 80% | 36,927 psi | 83% | 2497 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 29,834 psi | 67% | 2329 fps | 95.1% |
| Vihtavuori N133 | 24.4 gr | 88% | 33,054 psi | 75% | 2418 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 94% | 32,532 psi | 74% | 2490 fps | 95.3% |
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 16 powders for .25-35 Win. loaded with the .257 | 87gr | Hornady SP. IMR 3031 delivers the highest muzzle velocity at 2,661 fps; across all powders the maximum-charge window runs from 1,703 fps to 2,661 fps. Accurate 2495 gives the best case fill at 100 %, and 16 of the 16 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 72–90 %, leaving at least 10 % headroom. The 87.0 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, Accurate 2015, Vihtavuori N133 rank at the top here: for .25-35 Win. with the .257 | 87gr | Hornady SP 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.