Load Specifications
Load data in caliber .32 Win. Spec. with .321 | 170gr | Winchester Silvertip bullet and 17 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-10x, Norma 200 and ADI AR 2207.
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>> | 84% | 39,610 psi | 90% | 2096 fps | 97.9% |
| Accurate 2015ᴾ | <<locked>> | 100% | 39,508 psi | 89% | 2175 fps | 96.9% |
| ADI AR 2207 | <<locked>> | 88% | 38,972 psi | 88% | 2156 fps | 100% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 37,086 psi | 84% | 2195 fps | 98.6% |
| Alliant Reloder-10x | <<locked>> | 94% | 38,479 psi | 87% | 2172 fps | 97.9% |
| Alliant Reloder-7 | <<locked>> | 86% | 38,537 psi | 87% | 2113 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,545 psi | 69% | 1352 fps | 100% |
| IMR 4198 | <<locked>> | 92% | 39,059 psi | 88% | 2129 fps | 98.7% |
| Lovex S053 | <<locked>> | 82% | 39,262 psi | 89% | 2070 fps | 100% |
| Norma 200 | <<locked>> | 90% | 38,537 psi | 87% | 2162 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,168 psi | 68% | 1385 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 82% | 39,392 psi | 89% | 2119 fps | 99.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 38,682 psi | 87% | 1949 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 94% | 39,943 psi | 90% | 2175 fps | 96.1% |
| Vihtavuori N120 | <<locked>> | 88% | 39,218 psi | 89% | 2126 fps | 100% |
| Vihtavuori N130 | <<locked>> | 96% | 39,827 psi | 90% | 2139 fps | 97.8% |
| Vihtavuori N133ᴾ | <<locked>> | 100% | 38,885 psi | 88% | 2126 fps | 96.4% |
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% | 34,911 psi | 79% | 2014 fps | 96.7% |
| Accurate 2015 | <<locked>> | 96% | 35,012 psi | 79% | 2096 fps | 95.6% |
| ADI AR 2207 | 23.8 gr | 80% | 30,356 psi | 69% | 1995 fps | 98.9% |
| Alliant AR-Comp | <<locked>> | 92% | 29,051 psi | 66% | 2021 fps | 95.7% |
| Alliant Reloder-10x | 25.8 gr | 86% | 30,110 psi | 68% | 2008 fps | 95.3% |
| Alliant Reloder-7 | <<locked>> | 80% | 31,966 psi | 72% | 1988 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,568 psi | 51% | 1207 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 27,934 psi | 63% | 1900 fps | 95.1% |
| Lovex S053 | <<locked>> | 80% | 36,970 psi | 84% | 2034 fps | 100% |
| Norma 200 | 24.9 gr | 80% | 28,326 psi | 64% | 1959 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,060 psi | 50% | 1230 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 37,086 psi | 84% | 2080 fps | 99.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 34,896 psi | 79% | 1893 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 92% | 37,608 psi | 85% | 2133 fps | 95.4% |
| Vihtavuori N120 | <<locked>> | 80% | 30,632 psi | 69% | 1975 fps | 99.6% |
| Vihtavuori N130 | <<locked>> | 88% | 31,415 psi | 71% | 1985 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 96% | 34,635 psi | 78% | 2051 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 17 powders for .32 Win. Spec. loaded with the .321 | 170gr | Winchester Silvertip. Alliant AR-Comp delivers the highest muzzle velocity at 2,195 fps; across all powders the maximum-charge window runs from 1,352 fps to 2,195 fps. Accurate 2015 gives the best case fill at 100 %, and 17 of the 17 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 68–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.321" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 2015, 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. Alliant Reloder-10x, Norma 200, ADI AR 2207 rank at the top here: for .32 Win. Spec. with the .321 | 170gr | Winchester Silvertip 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.