Load Specifications
Load data in caliber .32 Win. SL. with .321 | 170gr | H&N KS KB bullet and 3 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 14 and Hodgdon TrailBoss.
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: 22"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Hodgdon TrailBoss | <<locked>> | 96% | 19,870 psi | 88% | 951 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 20,160 psi | 90% | 994 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 90% | 19,740 psi | 88% | 1342 fps | 96.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 22"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Hodgdon TrailBoss | 3.6 gr | 80% | 15,084 psi | 67% | 866 fps | 100% |
| ReloadSwiss RS 14 | 3.7 gr | 80% | 14,359 psi | 64% | 889 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 17,477 psi | 78% | 1286 fps | 95.4% |
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 3 powders for .32 Win. SL. loaded with the .321 | 170gr | H&N KS KB. SNPE Vectan BA6 1/2 delivers the highest muzzle velocity at 1,342 fps; across all powders the maximum-charge window runs from 951 fps to 1,342 fps. ReloadSwiss RS 14 gives the best case fill at 100 %, and 3 of the 3 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (155 MPa), the top charges use 88–90 %, leaving at least 10 % headroom. 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. ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for .32 Win. SL. with the .321 | 170gr | H&N KS KB they combine a high case fill with complete burn and sit in the upper velocity band. Hodgdon TrailBoss, ReloadSwiss RS 14 stay subsonic at start load. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.