Load Specifications
Load data in caliber .25-35 Win. with .257 | 117gr | Sierra SPT Pro-Hunter bullet and 26 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Lovex D073.6, Shooters World Match Rifle and Accurate 4064.
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>> | 86% | 39,711 psi | 90% | 2231 fps | 99.6% |
| Accurate 2460 | <<locked>> | 82% | 37,434 psi | 85% | 2211 fps | 97% |
| Accurate 2495 | <<locked>> | 92% | 37,420 psi | 85% | 2254 fps | 99.5% |
| Accurate 2520 | <<locked>> | 86% | 37,637 psi | 85% | 2254 fps | 96.7% |
| Accurate 4064 | <<locked>> | 96% | 39,914 psi | 90% | 2316 fps | 98.4% |
| Alliant AR-Comp | <<locked>> | 88% | 39,001 psi | 88% | 2297 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 84% | 38,841 psi | 88% | 2195 fps | 95.7% |
| Hodgdon H322 | <<locked>> | 82% | 38,711 psi | 88% | 2254 fps | 98.5% |
| Hodgdon H335 | <<locked>> | 82% | 39,204 psi | 89% | 2267 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,475 psi | 76% | 1460 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 39,552 psi | 89% | 2323 fps | 99.3% |
| Lovex D073.6 | <<locked>> | 90% | 38,682 psi | 87% | 2283 fps | 96.9% |
| Norma 202 | <<locked>> | 88% | 37,826 psi | 86% | 2241 fps | 97.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,649 psi | 76% | 1496 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 38,609 psi | 87% | 2231 fps | 96.5% |
| Rottweil R 901 | <<locked>> | 86% | 39,247 psi | 89% | 2231 fps | 97.5% |
| Shooters World Match Rifle | <<locked>> | 90% | 38,682 psi | 87% | 2283 fps | 96.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 37,898 psi | 86% | 2162 fps | 97.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 39,044 psi | 88% | 2201 fps | 98.5% |
| Somchem S335 | <<locked>> | 88% | 39,189 psi | 89% | 2205 fps | 98.4% |
| Vihtavuori N130 | <<locked>> | 82% | 38,348 psi | 87% | 2172 fps | 99.8% |
| Vihtavuori N133 | <<locked>> | 88% | 39,871 psi | 90% | 2211 fps | 99.6% |
| Vihtavuori N135 | <<locked>> | 92% | 38,638 psi | 87% | 2264 fps | 99.6% |
| Vihtavuori N140 | <<locked>> | 90% | 38,159 psi | 86% | 2228 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 92% | 38,696 psi | 87% | 2254 fps | 97.4% |
| Winchester 748 | <<locked>> | 88% | 39,363 psi | 89% | 2300 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% | 32,938 psi | 74% | 2106 fps | 98.5% |
| Accurate 2460 | <<locked>> | 80% | 35,331 psi | 80% | 2172 fps | 96.4% |
| Accurate 2495 | <<locked>> | 80% | 25,411 psi | 57% | 1991 fps | 96.3% |
| Accurate 2520 | <<locked>> | 82% | 32,750 psi | 74% | 2156 fps | 95% |
| Accurate 4064 | 23.9 gr | 88% | 30,922 psi | 70% | 2136 fps | 95.7% |
| Alliant AR-Comp | <<locked>> | 80% | 30,023 psi | 68% | 2116 fps | 99.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 36,782 psi | 83% | 2156 fps | 95% |
| Hodgdon H322 | <<locked>> | 80% | 36,071 psi | 82% | 2201 fps | 97.9% |
| Hodgdon H335 | <<locked>> | 80% | 36,622 psi | 83% | 2218 fps | 97% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,656 psi | 56% | 1299 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 28,805 psi | 65% | 2090 fps | 96.3% |
| Lovex D073.6 | 24.6 gr | 86% | 33,547 psi | 76% | 2182 fps | 95.3% |
| Norma 202 | <<locked>> | 82% | 31,067 psi | 70% | 2100 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,497 psi | 55% | 1329 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 36,042 psi | 81% | 2182 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 32,822 psi | 74% | 2100 fps | 95.5% |
| Shooters World Match Rifle | 24.6 gr | 86% | 33,547 psi | 76% | 2182 fps | 95.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 31,444 psi | 71% | 2031 fps | 95.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 28,892 psi | 65% | 1998 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 30,995 psi | 70% | 2041 fps | 96.1% |
| Vihtavuori N130 | <<locked>> | 80% | 35,824 psi | 81% | 2126 fps | 99.5% |
| Vihtavuori N133 | <<locked>> | 80% | 31,241 psi | 71% | 2047 fps | 97.9% |
| Vihtavuori N135 | <<locked>> | 80% | 26,281 psi | 59% | 1998 fps | 96.4% |
| Vihtavuori N140 | <<locked>> | 84% | 31,415 psi | 71% | 2093 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 86% | 32,010 psi | 72% | 2116 fps | 95.2% |
| Winchester 748 | <<locked>> | 86% | 36,811 psi | 83% | 2251 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 26 powders for .25-35 Win. loaded with the .257 | 117gr | Sierra SPT Pro-Hunter. IMR 3031 delivers the highest muzzle velocity at 2,323 fps; across all powders the maximum-charge window runs from 1,460 fps to 2,323 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 26 of the 26 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 76–90 %, leaving at least 10 % headroom. The 117.0 gr projectile in 0.257" calls for a 1:11.5 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. Lovex D073.6, Shooters World Match Rifle, Accurate 4064 rank at the top here: for .25-35 Win. with the .257 | 117gr | Sierra SPT Pro-Hunter 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.