Load Specifications
Load data in caliber 9 mm Steyr with .357 | 158gr | Fiocchi SJSP bullet and 10 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 ≥ 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: 5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Alliant Herco² | <<locked>> | 68% | 15,780 psi | 81% | 817 fps | 96.6% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 72% | 17,027 psi | 87% | 804 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 14,330 psi | 73% | 709 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 13,663 psi | 70% | 719 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 64% | 17,434 psi | 89% | 873 fps | 99.2% |
| Rottweil P 806*² | <<locked>> | 76% | 16,998 psi | 87% | 948 fps | 89.9% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 17,303 psi | 88% | 843 fps | 90% |
| Vihtavuori 3N37*² | <<locked>> | 64% | 17,202 psi | 88% | 863 fps | 91.4% |
| Vihtavuori N32C Tin Star² | <<locked>> | 76% | 16,143 psi | 82% | 732 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 68% | 16,810 psi | 86% | 856 fps | 91.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Alliant Herco*² | <<locked>> | 60% | 13,373 psi | 68% | 758 fps | 94.4% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 12,908 psi | 66% | 722 fps | 100% |
| Hodgdon TrailBoss² | 1.8 gr | 60% | 7,644 psi | 39% | 535 fps | 99.8% |
| ReloadSwiss RS 14² | 1.9 gr | 60% | 7,658 psi | 39% | 545 fps | 97.8% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 15,200 psi | 78% | 823 fps | 98.1% |
| Rottweil P 806*² | <<locked>> | 68% | 13,518 psi | 69% | 863 fps | 85.4% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 60% | 14,228 psi | 73% | 771 fps | 86.4% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 15,156 psi | 77% | 820 fps | 89.2% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 11,835 psi | 60% | 650 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 60% | 13,619 psi | 70% | 781 fps | 87.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
* 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 10 powders for 9 mm Steyr loaded with the .357 | 158gr | Fiocchi SJSP. Rottweil P 806 delivers the highest muzzle velocity at 948 fps; across all powders the maximum-charge window runs from 709 fps to 948 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 2 of the 10 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (135 MPa), the top charges use 70–89 %, leaving at least 11 % headroom. 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. ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 9 mm Steyr with the .357 | 158gr | Fiocchi SJSP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Rottweil P 806, SNPE Vectan BA7 1/2, Vihtavuori 3N37 burn incompletely and react more sensitively to barrel length and temperature. Alliant Herco, Baschieri & Pellagri 102 Pistol, Hodgdon TrailBoss 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.