Load Specifications
Load data in caliber .25-35 Win. with .257 | 87gr | Speer MHP 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 N130.
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% | 39,291 psi | 89% | 2592 fps | 97.5% |
| Accurate 2495ᴾ | <<locked>> | 100% | 38,392 psi | 87% | 2644 fps | 97.6% |
| ADI AR 2207 | <<locked>> | 82% | 39,624 psi | 90% | 2589 fps | 100% |
| Alliant AR-Comp | <<locked>> | 94% | 38,232 psi | 86% | 2657 fps | 99.3% |
| Alliant Reloder-10x | <<locked>> | 88% | 39,958 psi | 90% | 2625 fps | 98.6% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 38,508 psi | 87% | 2507 fps | 96% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,039 psi | 72% | 1709 fps | 100% |
| IMR 3031 | <<locked>> | 96% | 39,030 psi | 88% | 2677 fps | 96.4% |
| IMR 4198 | <<locked>> | 86% | 39,320 psi | 89% | 2569 fps | 99.1% |
| Norma 200 | <<locked>> | 84% | 39,769 psi | 90% | 2605 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,923 psi | 72% | 1749 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 38,305 psi | 87% | 2579 fps | 96.4% |
| Vihtavuori N120 | <<locked>> | 82% | 39,740 psi | 90% | 2552 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 38,159 psi | 86% | 2530 fps | 98% |
| Vihtavuori N133 | <<locked>> | 94% | 39,813 psi | 90% | 2572 fps | 97.4% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 39,813 psi | 90% | 2657 fps | 97.8% |
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 | 24.4 gr | 86% | 32,576 psi | 74% | 2441 fps | 95.3% |
| Accurate 2495 | <<locked>> | 94% | 31,096 psi | 70% | 2480 fps | 95.2% |
| ADI AR 2207 | <<locked>> | 80% | 37,434 psi | 85% | 2543 fps | 99.9% |
| Alliant AR-Comp | 23.5 gr | 82% | 26,411 psi | 60% | 2339 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 31,285 psi | 71% | 2425 fps | 96.1% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 35,897 psi | 81% | 2451 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,569 psi | 53% | 1526 fps | 100% |
| IMR 3031 | <<locked>> | 94% | 36,550 psi | 83% | 2621 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 32,967 psi | 75% | 2425 fps | 97.7% |
| Norma 200 | <<locked>> | 80% | 35,302 psi | 80% | 2507 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,235 psi | 53% | 1555 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 35,810 psi | 81% | 2523 fps | 95.5% |
| Vihtavuori N120 | <<locked>> | 80% | 37,608 psi | 85% | 2513 fps | 100% |
| Vihtavuori N130 | 22.4 gr | 80% | 30,052 psi | 68% | 2339 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 88% | 33,127 psi | 75% | 2428 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 94% | 32,953 psi | 74% | 2503 fps | 95.6% |
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 43 powders for .25-35 Win. loaded with the .257 | 87gr | Speer MHP. IMR 3031 delivers the highest muzzle velocity at 2,677 fps; across all powders the maximum-charge window runs from 1,709 fps to 2,677 fps. Accurate 2495 gives the best case fill at 100 %, and 43 of the 43 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 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 2495, Accurate 4064, Hodgdon TrailBoss 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 N130 rank at the top here: for .25-35 Win. with the .257 | 87gr | Speer MHP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2460, Accurate 2520, Accurate 4064 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.