Load Specifications
Load data in caliber .25-35 Win. with .257 | 100gr | Swift A-Frame bullet and 21 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, IMR 3031 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% | 39,900 psi | 90% | 2428 fps | 98.7% |
| Accurate 2495 | <<locked>> | 98% | 39,682 psi | 90% | 2487 fps | 98.9% |
| Accurate 4064ᴾ | <<locked>> | 100% | 39,682 psi | 90% | 2503 fps | 96.7% |
| ADI AR 2219 | <<locked>> | 82% | 37,768 psi | 85% | 2418 fps | 96.7% |
| Alliant AR-Comp | <<locked>> | 92% | 38,943 psi | 88% | 2490 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 84% | 38,334 psi | 87% | 2408 fps | 99.2% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 38,464 psi | 87% | 2339 fps | 97.4% |
| Hodgdon H322 | <<locked>> | 88% | 38,638 psi | 87% | 2434 fps | 96.9% |
| Hodgdon H335 | <<locked>> | 84% | 39,595 psi | 90% | 2457 fps | 96% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,590 psi | 74% | 1581 fps | 100% |
| IMR 3031 | <<locked>> | 96% | 38,522 psi | 87% | 2493 fps | 97.8% |
| IMR 4198 | <<locked>> | 84% | 39,653 psi | 90% | 2395 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,590 psi | 74% | 1617 fps | 100% |
| Rottweil R 901 | <<locked>> | 90% | 39,479 psi | 89% | 2418 fps | 95.8% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 38,769 psi | 88% | 2408 fps | 97.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 39,711 psi | 90% | 2392 fps | 97.2% |
| Somchem S335 | <<locked>> | 92% | 39,784 psi | 90% | 2398 fps | 97.1% |
| Vihtavuori N130 | <<locked>> | 86% | 39,073 psi | 88% | 2372 fps | 99.1% |
| Vihtavuori N133 | <<locked>> | 90% | 38,043 psi | 86% | 2365 fps | 98.2% |
| Vihtavuori N135 | <<locked>> | 96% | 38,189 psi | 86% | 2448 fps | 98.6% |
| Vihtavuori N140 | <<locked>> | 94% | 38,392 psi | 87% | 2415 fps | 96.1% |
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% | 29,254 psi | 66% | 2195 fps | 95.6% |
| Accurate 2495 | <<locked>> | 88% | 28,384 psi | 64% | 2244 fps | 95.7% |
| Accurate 4064 | <<locked>> | 96% | 34,563 psi | 78% | 2398 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 35,288 psi | 80% | 2365 fps | 95.8% |
| Alliant AR-Comp | 22 gr | 80% | 26,731 psi | 60% | 2198 fps | 97.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 33,779 psi | 76% | 2313 fps | 98.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 36,158 psi | 82% | 2293 fps | 96.8% |
| Hodgdon H322 | <<locked>> | 84% | 34,127 psi | 77% | 2336 fps | 95.4% |
| Hodgdon H335 | <<locked>> | 82% | 37,072 psi | 84% | 2405 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,105 psi | 54% | 1414 fps | 100% |
| IMR 3031 | 24 gr | 90% | 32,126 psi | 73% | 2346 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 35,346 psi | 80% | 2306 fps | 99.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,844 psi | 54% | 1440 fps | 100% |
| Rottweil R 901 | <<locked>> | 88% | 37,362 psi | 84% | 2375 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 34,084 psi | 77% | 2310 fps | 96.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 33,156 psi | 75% | 2257 fps | 95% |
| Somchem S335 | <<locked>> | 86% | 33,431 psi | 76% | 2267 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 32,271 psi | 73% | 2228 fps | 97.6% |
| Vihtavuori N133 | <<locked>> | 82% | 29,979 psi | 68% | 2188 fps | 95.7% |
| Vihtavuori N135 | 23.2 gr | 86% | 28,326 psi | 64% | 2221 fps | 95.3% |
| Vihtavuori N140 | <<locked>> | 92% | 35,940 psi | 81% | 2362 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 21 powders for .25-35 Win. loaded with the .257 | 100gr | Swift A-Frame. Accurate 4064 delivers the highest muzzle velocity at 2,503 fps; across all powders the maximum-charge window runs from 1,581 fps to 2,503 fps. Accurate 4064 gives the best case fill at 100 %, and 21 of the 21 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 1:11.5 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. Alliant AR-Comp, IMR 3031, Vihtavuori N135 rank at the top here: for .25-35 Win. with the .257 | 100gr | Swift A-Frame 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.