Load Specifications
Load data in caliber .32 S&W with .312 | 71gr | Berry's Round Nose bullet and 6 powders. The key underlying parameters are shown in the table above.
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 ≥ 60% and propellant combustion ≥ 80%. 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: 3"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AS 30*² | <<locked>> | 64% | 10,544 psi | 81% | 630 fps | 88.1% |
| Alliant RED DOT*² | <<locked>> | 72% | 11,545 psi | 88% | 676 fps | 88.9% |
| Hodgdon Clays² | <<locked>> | 68% | 11,385 psi | 87% | 633 fps | 95.2% |
| Maxam CSB 5*² | <<locked>> | 68% | 11,052 psi | 85% | 669 fps | 92.2% |
| Rottweil P 801*² | <<locked>> | 68% | 11,052 psi | 85% | 722 fps | 88.2% |
| Vihtavuori N32C Tin Star*ᴾ | <<locked>> | 100% | 9,790 psi | 75% | 656 fps | 90.3% |
Start Load - Barrel Length: 3"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AS 30*² | <<locked>> | 60% | 10,544 psi | 81% | 630 fps | 88.1% |
| Alliant RED DOT*² | <<locked>> | 64% | 10,153 psi | 78% | 633 fps | 86.4% |
| Hodgdon Clays*² | <<locked>> | 60% | 9,921 psi | 76% | 594 fps | 93.2% |
| Maxam CSB 5*² | <<locked>> | 60% | 9,703 psi | 74% | 627 fps | 89.7% |
| Rottweil P 801*² | <<locked>> | 64% | 9,964 psi | 76% | 686 fps | 85.9% |
| Vihtavuori N32C Tin Star* | <<locked>> | 84% | 8,050 psi | 62% | 591 fps | 85.7% |
* not dangerous but load has suboptimal powder burnt with possible characteristics such as extensive muzzle flash or inaccurate loads.
² fill rate low - you might want to consider using a filler to ensure proper ignition.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 1 powders for .32 S&W loaded with the .312 | 71gr | Berry's Round Nose. Vihtavuori N32C Tin Star delivers the highest muzzle velocity at 656 fps; across all powders the maximum-charge window runs from 656 fps to 656 fps. Vihtavuori N32C Tin Star gives the best case fill at 100 %, and 1 of the 1 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (90 MPa), the top charges use 75–75 %, leaving at least 25 % headroom. Vihtavuori N32C Tin Star 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. As outliers, Vihtavuori N32C Tin Star burn incompletely and react more sensitively to barrel length and temperature. Vihtavuori N32C Tin Star 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.