Load Specifications
Load data in caliber 9 mm Steyr with .355 | 147gr | Winchester FMJ HB 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>> | 72% | 17,347 psi | 89% | 889 fps | 96.9% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 72% | 16,578 psi | 85% | 833 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 14,112 psi | 72% | 741 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 13,387 psi | 68% | 751 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 64% | 16,157 psi | 83% | 886 fps | 98% |
| Rottweil P 806*² | <<locked>> | 76% | 16,346 psi | 83% | 974 fps | 87.9% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 16,723 psi | 85% | 866 fps | 88.2% |
| Vihtavuori 3N37*² | <<locked>> | 64% | 16,534 psi | 84% | 889 fps | 89.6% |
| Vihtavuori N32C Tin Star | <<locked>> | 80% | 17,419 psi | 89% | 791 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 68% | 16,259 psi | 83% | 883 fps | 89.7% |
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% | 13,097 psi | 67% | 784 fps | 93.1% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 12,053 psi | 62% | 738 fps | 100% |
| Hodgdon TrailBoss² | 1.9 gr | 60% | 7,702 psi | 39% | 564 fps | 99.6% |
| ReloadSwiss RS 14² | 1.9 gr | 60% | 7,324 psi | 37% | 558 fps | 96.7% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 14,794 psi | 76% | 853 fps | 97.1% |
| Rottweil P 806*² | <<locked>> | 72% | 14,431 psi | 74% | 925 fps | 85.3% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 64% | 14,953 psi | 76% | 823 fps | 86.1% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 14,634 psi | 75% | 843 fps | 87.3% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 11,153 psi | 57% | 666 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 60% | 13,213 psi | 67% | 804 fps | 85.8% |
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 .355 | 147gr | Winchester FMJ HB. Rottweil P 806 delivers the highest muzzle velocity at 974 fps; across all powders the maximum-charge window runs from 741 fps to 974 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 3 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 68–89 %, 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 .355 | 147gr | Winchester FMJ HB 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.