Load Specifications
Load data in caliber .25-35 Win. with .257 | 100gr | Speer Varmint Hollow Point bullet and 23 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 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>> | 88% | 38,392 psi | 87% | 2405 fps | 98.5% |
| Accurate 2460 | <<locked>> | 86% | 39,102 psi | 88% | 2438 fps | 95.9% |
| Accurate 2495 | <<locked>> | 96% | 38,450 psi | 87% | 2474 fps | 98.8% |
| Accurate 4064 | <<locked>> | 98% | 38,043 psi | 86% | 2477 fps | 96.4% |
| ADI AR 2219 | <<locked>> | 82% | 38,827 psi | 88% | 2451 fps | 97.1% |
| Alliant AR-Comp | <<locked>> | 90% | 37,797 psi | 85% | 2477 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 84% | 39,160 psi | 89% | 2431 fps | 99.4% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 39,363 psi | 89% | 2365 fps | 97.8% |
| Hodgdon H322 | <<locked>> | 84% | 37,565 psi | 85% | 2425 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,634 psi | 74% | 1591 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 38,232 psi | 86% | 2497 fps | 97.8% |
| IMR 4198 | <<locked>> | 82% | 38,261 psi | 86% | 2375 fps | 99.7% |
| Norma 202 | <<locked>> | 92% | 39,102 psi | 88% | 2457 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,634 psi | 74% | 1627 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 39,102 psi | 88% | 2448 fps | 96% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 39,537 psi | 89% | 2434 fps | 98.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 39,581 psi | 89% | 2382 fps | 96.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 38,363 psi | 87% | 2379 fps | 97% |
| Somchem S335 | <<locked>> | 90% | 38,624 psi | 87% | 2385 fps | 96.9% |
| Vihtavuori N130 | <<locked>> | 86% | 39,769 psi | 90% | 2395 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 90% | 39,088 psi | 88% | 2392 fps | 98.6% |
| Vihtavuori N135 | <<locked>> | 96% | 39,740 psi | 90% | 2484 fps | 99% |
| Vihtavuori N140 | <<locked>> | 94% | 39,320 psi | 89% | 2441 fps | 96.6% |
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% | 29,936 psi | 68% | 2218 fps | 96% |
| Accurate 2460 | <<locked>> | 84% | 36,622 psi | 83% | 2385 fps | 95% |
| Accurate 2495 | 24.5 gr | 86% | 27,412 psi | 62% | 2224 fps | 95.4% |
| Accurate 4064 | <<locked>> | 96% | 35,955 psi | 81% | 2438 fps | 95.8% |
| ADI AR 2219 | <<locked>> | 80% | 36,318 psi | 82% | 2395 fps | 96.4% |
| Alliant AR-Comp | 22.6 gr | 80% | 27,615 psi | 62% | 2231 fps | 97.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 34,592 psi | 78% | 2336 fps | 98.6% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 36,999 psi | 84% | 2320 fps | 97.2% |
| Hodgdon H322 | <<locked>> | 80% | 33,243 psi | 75% | 2326 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,323 psi | 55% | 1424 fps | 100% |
| IMR 3031 | 24.2 gr | 86% | 31,662 psi | 72% | 2343 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 36,187 psi | 82% | 2333 fps | 99.5% |
| Norma 202 | <<locked>> | 90% | 36,593 psi | 83% | 2405 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,062 psi | 54% | 1453 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 36,651 psi | 83% | 2395 fps | 95.2% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 34,867 psi | 79% | 2336 fps | 96.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 37,014 psi | 84% | 2329 fps | 95.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 33,634 psi | 76% | 2277 fps | 95.4% |
| Somchem S335 | <<locked>> | 86% | 34,011 psi | 77% | 2287 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 32,982 psi | 75% | 2254 fps | 98% |
| Vihtavuori N133 | <<locked>> | 80% | 28,674 psi | 65% | 2162 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 86% | 28,921 psi | 65% | 2244 fps | 95.8% |
| Vihtavuori N140 | <<locked>> | 90% | 34,534 psi | 78% | 2343 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 23 powders for .25-35 Win. loaded with the .257 | 100gr | Speer Varmint Hollow Point. IMR 3031 delivers the highest muzzle velocity at 2,497 fps; across all powders the maximum-charge window runs from 1,591 fps to 2,497 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 23 of the 23 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 74–90 %, leaving at least 10 % headroom. The 100.0 gr projectile in 0.257" calls for a 1:12.0 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. IMR 3031, Alliant AR-Comp, Accurate 2495 rank at the top here: for .25-35 Win. with the .257 | 100gr | Speer Varmint Hollow Point 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.