Load Specifications
Load data in caliber .25-35 Win. with .257 | 100gr | Nosler Partition bullet and 47 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 3031, Alliant AR-Comp and Vihtavuori N135.
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% | 39,581 psi | 89% | 2418 fps | 98.6% |
| Accurate 2015 | <<locked>> | 88% | 38,725 psi | 88% | 2415 fps | 98.6% |
| Accurate 2460 | <<locked>> | 86% | 39,392 psi | 89% | 2444 fps | 96% |
| Accurate 2495 | <<locked>> | 98% | 39,363 psi | 89% | 2480 fps | 98.9% |
| Accurate 2495 | <<locked>> | 96% | 38,812 psi | 88% | 2480 fps | 98.9% |
| Accurate 4064ᴾ | <<locked>> | 100% | 38,943 psi | 88% | 2487 fps | 96.5% |
| Accurate 4064 | <<locked>> | 98% | 38,783 psi | 88% | 2497 fps | 96.7% |
| ADI AR 2219 | <<locked>> | 82% | 37,478 psi | 85% | 2408 fps | 96.5% |
| ADI AR 2219 | <<locked>> | 82% | 39,131 psi | 88% | 2461 fps | 97.3% |
| Alliant AR-Comp | <<locked>> | 92% | 38,682 psi | 87% | 2480 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 90% | 38,159 psi | 86% | 2487 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 84% | 38,000 psi | 86% | 2398 fps | 99.1% |
| Alliant Reloder-10x | <<locked>> | 84% | 39,523 psi | 89% | 2441 fps | 99.5% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 38,232 psi | 86% | 2333 fps | 97.3% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 39,595 psi | 90% | 2372 fps | 97.9% |
| Hodgdon H322 | <<locked>> | 86% | 39,189 psi | 89% | 2444 fps | 97% |
| Hodgdon H322 | <<locked>> | 84% | 37,869 psi | 86% | 2434 fps | 96.9% |
| Hodgdon H335 | <<locked>> | 86% | 39,334 psi | 89% | 2448 fps | 95.9% |
| Hodgdon H335 | <<locked>> | 84% | 38,711 psi | 88% | 2451 fps | 96% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,430 psi | 73% | 1575 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,764 psi | 74% | 1598 fps | 100% |
| IMR 3031 | <<locked>> | 94% | 39,102 psi | 88% | 2500 fps | 97.9% |
| IMR 3031 | <<locked>> | 92% | 38,537 psi | 87% | 2507 fps | 98% |
| IMR 4198 | <<locked>> | 82% | 38,638 psi | 87% | 2385 fps | 99.8% |
| IMR 4198 | <<locked>> | 84% | 39,755 psi | 90% | 2392 fps | 99.8% |
| Norma 200 | <<locked>> | 82% | 40,016 psi | 90% | 2421 fps | 99.7% |
| Norma 202 | <<locked>> | 94% | 39,987 psi | 90% | 2461 fps | 96.2% |
| Norma 202 | <<locked>> | 92% | 39,392 psi | 89% | 2467 fps | 96.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,460 psi | 73% | 1614 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,779 psi | 74% | 1634 fps | 100% |
| Rottweil R 901 | <<locked>> | 88% | 38,783 psi | 88% | 2418 fps | 95.8% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 39,378 psi | 89% | 2457 fps | 96.1% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 39,929 psi | 90% | 2444 fps | 98.3% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 38,363 psi | 87% | 2398 fps | 97.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 39,856 psi | 90% | 2392 fps | 96.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 39,465 psi | 89% | 2382 fps | 97% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 38,595 psi | 87% | 2385 fps | 97.1% |
| Somchem S335 | <<locked>> | 92% | 39,508 psi | 89% | 2388 fps | 96.9% |
| Somchem S335 | <<locked>> | 90% | 38,943 psi | 88% | 2395 fps | 97.1% |
| Vihtavuori N130 | <<locked>> | 86% | 38,740 psi | 88% | 2362 fps | 99% |
| Vihtavuori N130 | <<locked>> | 84% | 37,579 psi | 85% | 2356 fps | 99% |
| Vihtavuori N133 | <<locked>> | 90% | 37,739 psi | 85% | 2352 fps | 98.1% |
| Vihtavuori N133 | <<locked>> | 90% | 39,378 psi | 89% | 2402 fps | 98.7% |
| Vihtavuori N135 | <<locked>> | 96% | 37,898 psi | 86% | 2438 fps | 98.5% |
| Vihtavuori N135 | <<locked>> | 94% | 37,420 psi | 85% | 2444 fps | 98.6% |
| Vihtavuori N140 | <<locked>> | 94% | 38,174 psi | 86% | 2405 fps | 96% |
| Vihtavuori N140 | <<locked>> | 94% | 39,566 psi | 89% | 2451 fps | 96.7% |
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% | 28,935 psi | 65% | 2185 fps | 95.4% |
| Accurate 2015 | <<locked>> | 80% | 30,284 psi | 68% | 2231 fps | 96.2% |
| Accurate 2460 | <<locked>> | 84% | 36,883 psi | 83% | 2392 fps | 95.2% |
| Accurate 2495 | <<locked>> | 88% | 28,094 psi | 64% | 2234 fps | 95.5% |
| Accurate 2495 | <<locked>> | 86% | 27,760 psi | 63% | 2234 fps | 95.6% |
| Accurate 4064 | <<locked>> | 98% | 36,709 psi | 83% | 2441 fps | 95.8% |
| Accurate 4064 | <<locked>> | 94% | 33,910 psi | 77% | 2392 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 34,983 psi | 79% | 2356 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 36,637 psi | 83% | 2408 fps | 96.5% |
| Alliant AR-Comp | 22.7 gr | 80% | 26,426 psi | 60% | 2185 fps | 96.9% |
| Alliant AR-Comp | 22.7 gr | 80% | 27,572 psi | 62% | 2234 fps | 97.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 33,402 psi | 76% | 2300 fps | 98.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 34,940 psi | 79% | 2349 fps | 98.7% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 35,868 psi | 81% | 2283 fps | 96.6% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 37,289 psi | 84% | 2329 fps | 97.3% |
| Hodgdon H322 | <<locked>> | 82% | 34,185 psi | 77% | 2336 fps | 95.3% |
| Hodgdon H322 | <<locked>> | 80% | 33,504 psi | 76% | 2336 fps | 95.4% |
| Hodgdon H335 | <<locked>> | 84% | 36,782 psi | 83% | 2395 fps | 95% |
| Hodgdon H335 | <<locked>> | 82% | 35,911 psi | 81% | 2392 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,917 psi | 54% | 1404 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,105 psi | 54% | 1424 fps | 100% |
| IMR 3031 | 25 gr | 88% | 32,590 psi | 74% | 2352 fps | 95.7% |
| IMR 3031 | 24.4 gr | 86% | 31,952 psi | 72% | 2352 fps | 95.8% |
| IMR 4198 | <<locked>> | 80% | 36,535 psi | 83% | 2346 fps | 99.5% |
| IMR 4198 | <<locked>> | 80% | 35,375 psi | 80% | 2306 fps | 99.2% |
| Norma 200 | <<locked>> | 80% | 37,797 psi | 85% | 2379 fps | 99.5% |
| Norma 202 | <<locked>> | 92% | 37,797 psi | 85% | 2418 fps | 95.5% |
| Norma 202 | <<locked>> | 90% | 36,927 psi | 83% | 2415 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,076 psi | 54% | 1444 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,250 psi | 55% | 1460 fps | 100% |
| Rottweil R 901 | <<locked>> | 86% | 36,434 psi | 82% | 2369 fps | 95.1% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 36,941 psi | 84% | 2405 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 35,215 psi | 80% | 2349 fps | 97.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 34,142 psi | 77% | 2310 fps | 96.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 37,318 psi | 84% | 2339 fps | 95.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 34,853 psi | 79% | 2293 fps | 95.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 34,243 psi | 77% | 2297 fps | 95.7% |
| Somchem S335 | <<locked>> | 88% | 35,027 psi | 79% | 2300 fps | 95.5% |
| Somchem S335 | <<locked>> | 86% | 34,301 psi | 78% | 2297 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 32,285 psi | 73% | 2228 fps | 97.6% |
| Vihtavuori N130 | <<locked>> | 80% | 33,301 psi | 75% | 2264 fps | 98.1% |
| Vihtavuori N133 | <<locked>> | 82% | 29,718 psi | 67% | 2175 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 28,964 psi | 65% | 2172 fps | 95.5% |
| Vihtavuori N135 | 23.9 gr | 86% | 28,036 psi | 63% | 2211 fps | 95.1% |
| Vihtavuori N135 | 23.3 gr | 84% | 27,311 psi | 62% | 2201 fps | 95% |
| Vihtavuori N140 | <<locked>> | 92% | 35,694 psi | 81% | 2352 fps | 95.1% |
| Vihtavuori N140 | <<locked>> | 90% | 35,114 psi | 79% | 2359 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 47 powders for .25-35 Win. loaded with the .257 | 100gr | Nosler Partition. IMR 3031 delivers the highest muzzle velocity at 2,507 fps; across all powders the maximum-charge window runs from 1,575 fps to 2,507 fps. Accurate 4064 gives the best case fill at 100 %, and 47 of the 47 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 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 4064, Hodgdon TrailBoss, 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. IMR 3031, Alliant AR-Comp, Vihtavuori N135 rank at the top here: for .25-35 Win. with the .257 | 100gr | Nosler Partition 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.