Load Specifications
Load data in caliber .25-35 Win. with .257 | 87gr | Speer Hot-Cor bullet and 15 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 N135 and Accurate 2495.
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>> | 90% | 38,305 psi | 87% | 2589 fps | 97.5% |
| Accurate 2495 | <<locked>> | 98% | 38,189 psi | 86% | 2651 fps | 97.8% |
| Accurate LT-30 | <<locked>> | 82% | 39,059 psi | 88% | 2516 fps | 96.2% |
| Alliant AR-Comp | <<locked>> | 92% | 37,579 psi | 85% | 2657 fps | 99.4% |
| Alliant Reloder-10x | <<locked>> | 86% | 39,102 psi | 88% | 2621 fps | 98.6% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 37,405 psi | 85% | 2500 fps | 96% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,300 psi | 73% | 1729 fps | 100% |
| IMR 3031 | <<locked>> | 94% | 38,232 psi | 86% | 2677 fps | 96.5% |
| IMR 4198 | <<locked>> | 84% | 38,522 psi | 87% | 2569 fps | 99.2% |
| Norma 200 | <<locked>> | 82% | 39,044 psi | 88% | 2602 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,169 psi | 73% | 1768 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 39,972 psi | 90% | 2631 fps | 97.1% |
| Vihtavuori N130 | <<locked>> | 86% | 37,739 psi | 85% | 2536 fps | 98.1% |
| Vihtavuori N133 | <<locked>> | 92% | 39,146 psi | 88% | 2575 fps | 97.5% |
| Vihtavuori N135 | <<locked>> | 98% | 39,436 psi | 89% | 2667 fps | 98% |
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>> | 84% | 32,010 psi | 72% | 2441 fps | 95.4% |
| Accurate 2495 | 27.7 gr | 92% | 30,835 psi | 70% | 2480 fps | 95.3% |
| Accurate LT-30 | <<locked>> | 80% | 37,057 psi | 84% | 2474 fps | 95.6% |
| Alliant AR-Comp | 23.9 gr | 80% | 25,947 psi | 59% | 2339 fps | 95.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 32,576 psi | 74% | 2470 fps | 96.9% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 34,969 psi | 79% | 2448 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,699 psi | 54% | 1542 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 35,882 psi | 81% | 2621 fps | 95.7% |
| IMR 4198 | <<locked>> | 80% | 34,258 psi | 77% | 2474 fps | 98.3% |
| Norma 200 | <<locked>> | 80% | 36,622 psi | 83% | 2552 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,743 psi | 54% | 1581 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 35,128 psi | 79% | 2523 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 31,227 psi | 71% | 2385 fps | 96.1% |
| Vihtavuori N133 | <<locked>> | 86% | 32,750 psi | 74% | 2431 fps | 95.5% |
| Vihtavuori N135 | 26.8 gr | 92% | 32,532 psi | 74% | 2510 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 15 powders for .25-35 Win. loaded with the .257 | 87gr | Speer Hot-Cor. IMR 3031 delivers the highest muzzle velocity at 2,677 fps; across all powders the maximum-charge window runs from 1,729 fps to 2,677 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 15 of the 15 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 87.0 gr projectile in 0.257" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. 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 N135, Accurate 2495 rank at the top here: for .25-35 Win. with the .257 | 87gr | Speer Hot-Cor 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.