Load Specifications
Load data in caliber .25-35 Win. with .257 | 70gr | Sierra Tipped VarmintKing bullet and 36 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma 200, IMR 4198 and ReloadSwiss RS 14.
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 1680 | <<locked>> | 82% | 38,624 psi | 87% | 2759 fps | 95.9% |
| Accurate 1680 | <<locked>> | 82% | 38,624 psi | 87% | 2759 fps | 95.9% |
| Accurate 1680 | <<locked>> | 82% | 39,363 psi | 89% | 2785 fps | 96.3% |
| ADI AR 2207 | <<locked>> | 86% | 38,334 psi | 87% | 2851 fps | 99.2% |
| ADI AR 2207 | <<locked>> | 86% | 38,319 psi | 87% | 2851 fps | 99.2% |
| ADI AR 2207 | <<locked>> | 86% | 38,841 psi | 88% | 2871 fps | 99.3% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 39,233 psi | 89% | 2940 fps | 97.5% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 39,218 psi | 89% | 2940 fps | 97.5% |
| Alliant AR-Comp | <<locked>> | 98% | 37,797 psi | 85% | 2913 fps | 97.2% |
| Alliant Reloder-10x | <<locked>> | 92% | 38,174 psi | 86% | 2861 fps | 95.9% |
| Alliant Reloder-10x | <<locked>> | 92% | 38,159 psi | 86% | 2861 fps | 95.9% |
| Alliant Reloder-10x | <<locked>> | 92% | 39,001 psi | 88% | 2887 fps | 96.3% |
| Alliant Reloder-7 | <<locked>> | 84% | 37,594 psi | 85% | 2782 fps | 96.3% |
| Alliant Reloder-7 | <<locked>> | 84% | 37,594 psi | 85% | 2785 fps | 96.3% |
| Alliant Reloder-7 | <<locked>> | 84% | 38,479 psi | 87% | 2812 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,777 psi | 70% | 1896 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,777 psi | 70% | 1896 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,951 psi | 70% | 1906 fps | 100% |
| IMR 4198 | <<locked>> | 90% | 38,667 psi | 87% | 2825 fps | 97% |
| IMR 4198 | <<locked>> | 90% | 38,667 psi | 87% | 2825 fps | 97% |
| IMR 4198 | <<locked>> | 90% | 39,131 psi | 88% | 2844 fps | 97.3% |
| Norma 200 | <<locked>> | 88% | 38,305 psi | 87% | 2851 fps | 96.8% |
| Norma 200 | <<locked>> | 88% | 38,290 psi | 87% | 2851 fps | 96.8% |
| Norma 200 | <<locked>> | 88% | 39,175 psi | 89% | 2877 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,443 psi | 69% | 1939 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,443 psi | 69% | 1939 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,618 psi | 69% | 1949 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 39,813 psi | 90% | 2661 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 39,813 psi | 90% | 2661 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 38,363 psi | 87% | 2638 fps | 100% |
| Vihtavuori N120 | <<locked>> | 86% | 38,522 psi | 87% | 2818 fps | 99.8% |
| Vihtavuori N120 | <<locked>> | 86% | 38,508 psi | 87% | 2818 fps | 99.8% |
| Vihtavuori N120 | <<locked>> | 86% | 39,073 psi | 88% | 2838 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 94% | 39,262 psi | 89% | 2818 fps | 95.9% |
| Vihtavuori N130 | <<locked>> | 94% | 39,262 psi | 89% | 2818 fps | 95.9% |
| Vihtavuori N130 | <<locked>> | 94% | 40,016 psi | 90% | 2841 fps | 96.3% |
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 1680 | <<locked>> | 80% | 36,260 psi | 82% | 2707 fps | 95.1% |
| Accurate 1680 | <<locked>> | 80% | 36,260 psi | 82% | 2707 fps | 95.1% |
| Accurate 1680 | <<locked>> | 80% | 36,956 psi | 84% | 2730 fps | 95.5% |
| ADI AR 2207 | <<locked>> | 80% | 31,705 psi | 72% | 2687 fps | 97.6% |
| ADI AR 2207 | <<locked>> | 80% | 31,691 psi | 72% | 2687 fps | 97.6% |
| ADI AR 2207 | <<locked>> | 80% | 32,198 psi | 73% | 2707 fps | 97.9% |
| Alliant AR-Comp | <<locked>> | 96% | 34,505 psi | 78% | 2818 fps | 95.7% |
| Alliant AR-Comp | <<locked>> | 96% | 34,505 psi | 78% | 2818 fps | 95.7% |
| Alliant AR-Comp | <<locked>> | 94% | 33,330 psi | 75% | 2795 fps | 95.4% |
| Alliant Reloder-10x | <<locked>> | 90% | 35,766 psi | 81% | 2802 fps | 95.1% |
| Alliant Reloder-10x | <<locked>> | 90% | 35,766 psi | 81% | 2802 fps | 95.1% |
| Alliant Reloder-10x | <<locked>> | 90% | 36,593 psi | 83% | 2831 fps | 95.5% |
| Alliant Reloder-7 | <<locked>> | 82% | 35,244 psi | 80% | 2726 fps | 95.5% |
| Alliant Reloder-7 | <<locked>> | 82% | 35,244 psi | 80% | 2726 fps | 95.5% |
| Alliant Reloder-7 | <<locked>> | 80% | 33,895 psi | 77% | 2700 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,307 psi | 50% | 1690 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,307 psi | 50% | 1690 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,597 psi | 51% | 1703 fps | 100% |
| IMR 4198 | 23.7 gr | 86% | 34,418 psi | 78% | 2720 fps | 95.6% |
| IMR 4198 | 23.7 gr | 86% | 34,418 psi | 78% | 2720 fps | 95.5% |
| IMR 4198 | 23.2 gr | 84% | 33,069 psi | 75% | 2690 fps | 95.2% |
| Norma 200 | 25.3 gr | 84% | 33,663 psi | 76% | 2736 fps | 95.2% |
| Norma 200 | 25.3 gr | 84% | 33,663 psi | 76% | 2736 fps | 95.2% |
| Norma 200 | 25.3 gr | 84% | 34,461 psi | 78% | 2762 fps | 95.7% |
| ReloadSwiss RS 14 | 8.5 gr | 80% | 22,191 psi | 50% | 1732 fps | 100% |
| ReloadSwiss RS 14 | 8.5 gr | 80% | 22,191 psi | 50% | 1732 fps | 100% |
| ReloadSwiss RS 14 | 8.5 gr | 80% | 22,466 psi | 51% | 1745 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 35,665 psi | 81% | 2579 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 35,650 psi | 81% | 2579 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 36,347 psi | 82% | 2598 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 31,865 psi | 72% | 2664 fps | 98.7% |
| Vihtavuori N120 | <<locked>> | 80% | 31,850 psi | 72% | 2664 fps | 98.7% |
| Vihtavuori N120 | <<locked>> | 80% | 32,416 psi | 73% | 2684 fps | 98.9% |
| Vihtavuori N130 | <<locked>> | 92% | 37,217 psi | 84% | 2772 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 92% | 37,217 psi | 84% | 2772 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 92% | 37,956 psi | 86% | 2799 fps | 95.7% |
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 36 powders for .25-35 Win. loaded with the .257 | 70gr | Sierra Tipped VarmintKing. Alliant AR-Comp delivers the highest muzzle velocity at 2,940 fps; across all powders the maximum-charge window runs from 1,896 fps to 2,940 fps. Alliant AR-Comp gives the best case fill at 100 %, and 36 of the 36 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 69–90 %, leaving at least 10 % headroom. The 70.0 gr projectile in 0.257" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Alliant AR-Comp, Alliant AR-Comp, 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. Norma 200, IMR 4198, ReloadSwiss RS 14 rank at the top here: for .25-35 Win. with the .257 | 70gr | Sierra Tipped VarmintKing 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.