Load Specifications
Load data in caliber .25-35 Win. with .257 | 100gr | Frontier PH HPBT 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 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% | 39,450 psi | 89% | 2415 fps | 98.6% |
| Accurate 2495 | <<locked>> | 98% | 38,798 psi | 88% | 2470 fps | 98.7% |
| Accurate 4064ᴾ | <<locked>> | 100% | 38,812 psi | 88% | 2484 fps | 96.4% |
| Accurate LT-30 | <<locked>> | 82% | 40,016 psi | 90% | 2343 fps | 97.4% |
| ADI AR 2219 | <<locked>> | 84% | 40,016 psi | 90% | 2461 fps | 97.2% |
| Alliant AR-Comp | <<locked>> | 92% | 38,566 psi | 87% | 2480 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 84% | 37,855 psi | 86% | 2395 fps | 99.1% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 38,203 psi | 86% | 2329 fps | 97.2% |
| Hodgdon H322 | <<locked>> | 86% | 38,682 psi | 87% | 2431 fps | 96.8% |
| Hodgdon H335 | <<locked>> | 86% | 39,262 psi | 89% | 2448 fps | 95.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,648 psi | 74% | 1578 fps | 100% |
| IMR 3031 | <<locked>> | 94% | 39,030 psi | 88% | 2500 fps | 97.8% |
| IMR 4198 | <<locked>> | 84% | 39,610 psi | 90% | 2388 fps | 99.8% |
| Norma 200 | <<locked>> | 82% | 39,900 psi | 90% | 2418 fps | 99.7% |
| Norma 202 | <<locked>> | 94% | 39,987 psi | 90% | 2461 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,169 psi | 73% | 1608 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 38,290 psi | 87% | 2395 fps | 97.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 38,972 psi | 88% | 2375 fps | 96.9% |
| Somchem S335 | <<locked>> | 92% | 39,421 psi | 89% | 2385 fps | 96.9% |
| Vihtavuori N130 | <<locked>> | 86% | 38,189 psi | 86% | 2352 fps | 98.9% |
| Vihtavuori N133 | <<locked>> | 92% | 39,842 psi | 90% | 2395 fps | 98.5% |
| Vihtavuori N135 | <<locked>> | 96% | 37,797 psi | 85% | 2438 fps | 98.4% |
| Vihtavuori N140 | <<locked>> | 94% | 37,681 psi | 85% | 2395 fps | 95.8% |
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 | <<locked>> | 80% | 28,805 psi | 65% | 2182 fps | 95.3% |
| Accurate 2495 | <<locked>> | 88% | 27,920 psi | 63% | 2231 fps | 95.4% |
| Accurate 4064 | <<locked>> | 98% | 36,230 psi | 82% | 2431 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 37,420 psi | 85% | 2293 fps | 96.7% |
| ADI AR 2219 | <<locked>> | 80% | 34,911 psi | 79% | 2352 fps | 95.6% |
| Alliant AR-Comp | 21.7 gr | 80% | 26,353 psi | 60% | 2182 fps | 96.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 33,272 psi | 75% | 2297 fps | 98.1% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 35,810 psi | 81% | 2283 fps | 96.6% |
| Hodgdon H322 | <<locked>> | 82% | 34,113 psi | 77% | 2333 fps | 95.3% |
| Hodgdon H335 | <<locked>> | 84% | 36,753 psi | 83% | 2395 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,062 psi | 54% | 1407 fps | 100% |
| IMR 3031 | 23.9 gr | 88% | 32,503 psi | 73% | 2352 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 34,853 psi | 79% | 2293 fps | 99.1% |
| Norma 200 | <<locked>> | 80% | 37,681 psi | 85% | 2375 fps | 99.4% |
| Norma 202 | <<locked>> | 92% | 37,304 psi | 84% | 2408 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,801 psi | 54% | 1437 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 33,591 psi | 76% | 2297 fps | 96.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 34,766 psi | 79% | 2287 fps | 95.5% |
| Somchem S335 | <<locked>> | 88% | 34,911 psi | 79% | 2297 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 31,807 psi | 72% | 2215 fps | 97.4% |
| Vihtavuori N133 | <<locked>> | 82% | 29,602 psi | 67% | 2172 fps | 95.4% |
| Vihtavuori N135 | 23.4 gr | 88% | 29,573 psi | 67% | 2251 fps | 95.8% |
| Vihtavuori N140 | <<locked>> | 92% | 35,621 psi | 81% | 2352 fps | 95.1% |
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 | Frontier PH HPBT. IMR 3031 delivers the highest muzzle velocity at 2,500 fps; across all powders the maximum-charge window runs from 1,578 fps to 2,500 fps. Accurate 4064 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 73–90 %, leaving at least 10 % headroom. The 100.0 gr projectile in 0.257" calls for a 1:10.0 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, Alliant AR-Comp, Vihtavuori N135 rank at the top here: for .25-35 Win. with the .257 | 100gr | Frontier PH HPBT 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.