Load Specifications
Load data in caliber .25-35 Win. with .257 | 52gr | Peregrine VRG-3 bullet and 13 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2207, Vihtavuori N120 and SNPE Vectan BA6 1/2.
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 |
|---|---|---|---|---|---|---|
| ADI AR 2207 | <<locked>> | 92% | 38,725 psi | 88% | 3274 fps | 97.1% |
| ADI AR 2207 | <<locked>> | 92% | 37,753 psi | 85% | 3258 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 29,037 psi | 66% | 2201 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,616 psi | 65% | 2198 fps | 100% |
| IMR 4227 | <<locked>> | 86% | 39,740 psi | 90% | 3209 fps | 96% |
| Lovex S053 | <<locked>> | 86% | 39,175 psi | 89% | 3199 fps | 98.8% |
| Lovex S053 | <<locked>> | 86% | 38,290 psi | 87% | 3186 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,427 psi | 64% | 2247 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 27,920 psi | 63% | 2244 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 88% | 38,421 psi | 87% | 3068 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 90% | 39,653 psi | 90% | 3100 fps | 100% |
| Vihtavuori N120 | <<locked>> | 92% | 38,943 psi | 88% | 3248 fps | 98.3% |
| Vihtavuori N120 | <<locked>> | 92% | 38,029 psi | 86% | 3228 fps | 98.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 20"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2207 | 26.6 gr | 88% | 34,098 psi | 77% | 3153 fps | 95.6% |
| ADI AR 2207 | 26.6 gr | 88% | 33,127 psi | 75% | 3130 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,060 psi | 48% | 1972 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,624 psi | 47% | 1965 fps | 100% |
| IMR 4227 | <<locked>> | 84% | 37,318 psi | 84% | 3146 fps | 95.2% |
| Lovex S053 | <<locked>> | 80% | 32,851 psi | 74% | 3028 fps | 97.2% |
| Lovex S053 | <<locked>> | 80% | 31,995 psi | 72% | 3012 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,726 psi | 47% | 2014 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,233 psi | 46% | 2011 fps | 100% |
| SNPE Vectan BA6 1/2 | 21.2 gr | 80% | 30,835 psi | 70% | 2884 fps | 100% |
| SNPE Vectan BA6 1/2 | 21.2 gr | 80% | 30,008 psi | 68% | 2867 fps | 100% |
| Vihtavuori N120 | 25.4 gr | 84% | 30,342 psi | 69% | 3005 fps | 95.4% |
| Vihtavuori N120 | 25.4 gr | 84% | 29,486 psi | 67% | 2982 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 28 powders for .25-35 Win. loaded with the .257 | 52gr | Peregrine VRG-3. Alliant Reloder-10x delivers the highest muzzle velocity at 3,307 fps; across all powders the maximum-charge window runs from 2,198 fps to 3,307 fps. Alliant Reloder-10x gives the best case fill at 100 %, and 28 of the 28 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 63–90 %, leaving at least 10 % headroom. Alliant Reloder-10x, 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. ADI AR 2207, Vihtavuori N120, SNPE Vectan BA6 1/2 rank at the top here: for .25-35 Win. with the .257 | 52gr | Peregrine VRG-3 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 1680, Accurate 1680, Alliant Reloder-10x burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.