Load Specifications
Load data in caliber .25-35 Win. with .257 | 85gr | Lehigh Defense Controlled Chaos 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 Reloder-10x, Norma 200 and ADI AR 2207.
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 1680 | <<locked>> | 84% | 38,029 psi | 86% | 2415 fps | 96.1% |
| ADI AR 2207 | <<locked>> | 90% | 39,566 psi | 89% | 2623 fps | 99.9% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 35,810 psi | 81% | 2611 fps | 97.9% |
| Alliant Reloder-10x | <<locked>> | 96% | 39,059 psi | 88% | 2637 fps | 97.7% |
| Alliant Reloder-7 | <<locked>> | 88% | 39,102 psi | 88% | 2568 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,705 psi | 69% | 1648 fps | 100% |
| IMR 4198 | <<locked>> | 94% | 39,929 psi | 90% | 2592 fps | 98.5% |
| IMR 4227 | <<locked>> | 82% | 38,580 psi | 87% | 2507 fps | 99.3% |
| Lovex S053 | <<locked>> | 82% | 37,927 psi | 86% | 2487 fps | 100% |
| Norma 200 | <<locked>> | 92% | 39,392 psi | 89% | 2630 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,806 psi | 70% | 1691 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 82% | 37,492 psi | 85% | 2528 fps | 99% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 39,639 psi | 90% | 2386 fps | 100% |
| Vihtavuori N120 | <<locked>> | 92% | 38,856 psi | 88% | 2568 fps | 100% |
| Vihtavuori N130 | <<locked>> | 98% | 39,276 psi | 89% | 2575 fps | 97.4% |
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 1680 | <<locked>> | 82% | 35,621 psi | 81% | 2365 fps | 95.3% |
| ADI AR 2207 | 17.8 gr | 80% | 29,066 psi | 66% | 2392 fps | 98.4% |
| Alliant AR-Comp | <<locked>> | 94% | 29,660 psi | 67% | 2455 fps | 95.5% |
| Alliant Reloder-10x | 19.7 gr | 88% | 30,516 psi | 69% | 2444 fps | 95% |
| Alliant Reloder-7 | <<locked>> | 80% | 30,748 psi | 70% | 2381 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,089 psi | 50% | 1471 fps | 100% |
| IMR 4198 | <<locked>> | 84% | 30,226 psi | 68% | 2367 fps | 95.6% |
| IMR 4227 | <<locked>> | 80% | 36,521 psi | 83% | 2464 fps | 98.9% |
| Lovex S053 | <<locked>> | 80% | 35,389 psi | 80% | 2437 fps | 100% |
| Norma 200 | 19 gr | 82% | 28,500 psi | 64% | 2380 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 21,640 psi | 49% | 1503 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 35,520 psi | 80% | 2486 fps | 98.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 33,576 psi | 76% | 2279 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 27,151 psi | 61% | 2307 fps | 98.7% |
| Vihtavuori N130 | <<locked>> | 92% | 32,953 psi | 74% | 2441 fps | 95.5% |
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 | 85gr | Lehigh Defense Controlled Chaos. Alliant Reloder-10x delivers the highest muzzle velocity at 2,637 fps; across all powders the maximum-charge window runs from 1,648 fps to 2,637 fps. Alliant AR-Comp 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 69–90 %, leaving at least 10 % headroom. The 85.0 gr projectile in 0.257" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Alliant AR-Comp, 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 Reloder-10x, Norma 200, ADI AR 2207 rank at the top here: for .25-35 Win. with the .257 | 85gr | Lehigh Defense Controlled Chaos 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.