Load Specifications
Load data in caliber .25-35 Win. with .257 | 100gr | Winchester Silvertip bullet and 24 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 3031, Vihtavuori N135 and Alliant AR-Comp.
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>> | 88% | 37,710 psi | 85% | 2385 fps | 98.3% |
| Accurate 2495 | <<locked>> | 96% | 37,376 psi | 84% | 2448 fps | 98.5% |
| Accurate 4064ᴾ | <<locked>> | 100% | 39,682 psi | 90% | 2507 fps | 96.8% |
| ADI AR 2219 | <<locked>> | 82% | 38,232 psi | 86% | 2431 fps | 96.8% |
| Alliant AR-Comp | <<locked>> | 92% | 39,392 psi | 89% | 2503 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 38,435 psi | 87% | 2411 fps | 99.2% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 38,899 psi | 88% | 2349 fps | 97.5% |
| Hodgdon H322 | <<locked>> | 86% | 39,523 psi | 89% | 2457 fps | 97.2% |
| Hodgdon H335 | <<locked>> | 86% | 39,987 psi | 90% | 2467 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,808 psi | 74% | 1588 fps | 100% |
| IMR 3031 | <<locked>> | 94% | 39,885 psi | 90% | 2523 fps | 98.1% |
| IMR 4198 | <<locked>> | 82% | 37,971 psi | 86% | 2362 fps | 99.6% |
| Norma 202 | <<locked>> | 92% | 38,087 psi | 86% | 2431 fps | 95.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,358 psi | 73% | 1617 fps | 100% |
| Rottweil R 901 | <<locked>> | 90% | 39,943 psi | 90% | 2431 fps | 96% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 39,233 psi | 89% | 2421 fps | 98% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 39,001 psi | 88% | 2362 fps | 95.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 37,463 psi | 85% | 2352 fps | 96.6% |
| Somchem S335 | <<locked>> | 90% | 37,681 psi | 85% | 2359 fps | 96.5% |
| Vihtavuori N130 | <<locked>> | 86% | 39,088 psi | 88% | 2375 fps | 99.2% |
| Vihtavuori N133 | <<locked>> | 90% | 38,493 psi | 87% | 2375 fps | 98.3% |
| Vihtavuori N135 | <<locked>> | 96% | 38,638 psi | 87% | 2457 fps | 98.7% |
| Vihtavuori N140 | <<locked>> | 94% | 38,377 psi | 87% | 2415 fps | 96.2% |
| Vihtavuori N540 | <<locked>> | 96% | 39,523 psi | 89% | 2451 fps | 95.9% |
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>> | 80% | 29,298 psi | 66% | 2198 fps | 95.6% |
| Accurate 2495 | <<locked>> | 88% | 28,790 psi | 65% | 2254 fps | 95.9% |
| Accurate 4064 | <<locked>> | 96% | 34,983 psi | 79% | 2408 fps | 95.3% |
| ADI AR 2219 | <<locked>> | 80% | 35,708 psi | 81% | 2375 fps | 96% |
| Alliant AR-Comp | 22.2 gr | 80% | 27,079 psi | 61% | 2211 fps | 97.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 33,852 psi | 77% | 2316 fps | 98.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 36,521 psi | 83% | 2303 fps | 96.9% |
| Hodgdon H322 | <<locked>> | 82% | 34,911 psi | 79% | 2359 fps | 95.7% |
| Hodgdon H335 | <<locked>> | 84% | 37,463 psi | 85% | 2418 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,931 psi | 54% | 1411 fps | 100% |
| IMR 3031 | 23.8 gr | 86% | 31,096 psi | 70% | 2323 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 35,810 psi | 81% | 2320 fps | 99.4% |
| Norma 202 | <<locked>> | 90% | 36,056 psi | 82% | 2388 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,091 psi | 54% | 1450 fps | 100% |
| Rottweil R 901 | <<locked>> | 88% | 37,826 psi | 86% | 2388 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 34,548 psi | 78% | 2323 fps | 96.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 36,405 psi | 82% | 2310 fps | 95% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 33,170 psi | 75% | 2260 fps | 95.1% |
| Somchem S335 | <<locked>> | 86% | 33,417 psi | 76% | 2270 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 32,692 psi | 74% | 2241 fps | 97.8% |
| Vihtavuori N133 | <<locked>> | 80% | 28,413 psi | 64% | 2149 fps | 95% |
| Vihtavuori N135 | 23.3 gr | 86% | 28,369 psi | 64% | 2224 fps | 95.3% |
| Vihtavuori N140 | <<locked>> | 92% | 36,303 psi | 82% | 2372 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 94% | 37,043 psi | 84% | 2398 fps | 95% |
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 24 powders for .25-35 Win. loaded with the .257 | 100gr | Winchester Silvertip. IMR 3031 delivers the highest muzzle velocity at 2,523 fps; across all powders the maximum-charge window runs from 1,588 fps to 2,523 fps. Accurate 4064 gives the best case fill at 100 %, and 24 of the 24 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 100.0 gr projectile in 0.257" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 4064, 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. IMR 3031, Vihtavuori N135, Alliant AR-Comp rank at the top here: for .25-35 Win. with the .257 | 100gr | Winchester Silvertip 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.