Load Specifications
Load data in caliber 9 mm Steyr with .357 | 147gr | H&N KS HS bullet and 16 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>> | 76% | 17,492 psi | 89% | 922 fps | 97.5% |
| Alliant UNIQUE² | <<locked>> | 64% | 17,158 psi | 88% | 915 fps | 97.2% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 76% | 17,172 psi | 88% | 873 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,676 psi | 65% | 745 fps | 100% |
| Maxam CSB 1² | <<locked>> | 64% | 16,520 psi | 84% | 863 fps | 99.9% |
| Maxam CSB 2² | <<locked>> | 64% | 16,940 psi | 87% | 896 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,632 psi | 59% | 748 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 64% | 15,476 psi | 79% | 899 fps | 98.1% |
| Rottweil P 806* | <<locked>> | 80% | 17,289 psi | 88% | 1027 fps | 89.7% |
| SNPE Vectan A0² | <<locked>> | 64% | 16,665 psi | 85% | 869 fps | 96.6% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 72% | 17,637 psi | 90% | 915 fps | 90% |
| Vihtavuori 3N37*² | <<locked>> | 68% | 17,434 psi | 89% | 938 fps | 91.3% |
| Vihtavuori N32C Tin Star | <<locked>> | 84% | 17,419 psi | 89% | 820 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 17,550 psi | 90% | 909 fps | 97.7% |
| Vihtavuori N350*² | <<locked>> | 72% | 17,274 psi | 88% | 935 fps | 91.6% |
| Winchester AutoComp ² | <<locked>> | 64% | 17,042 psi | 87% | 889 fps | 99.7% |
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% | 11,516 psi | 59% | 774 fps | 91.7% |
| Alliant UNIQUE² | <<locked>> | 60% | 15,650 psi | 80% | 883 fps | 96.2% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 11,226 psi | 57% | 751 fps | 100% |
| Hodgdon TrailBoss² | 2 gr | 60% | 6,063 psi | 31% | 548 fps | 98.1% |
| Maxam CSB 1² | <<locked>> | 60% | 14,968 psi | 76% | 830 fps | 99.5% |
| Maxam CSB 2² | <<locked>> | 60% | 15,287 psi | 78% | 866 fps | 100% |
| ReloadSwiss RS 14*² | 2 gr | 60% | 5,569 psi | 28% | 535 fps | 93.2% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 14,112 psi | 72% | 866 fps | 97.1% |
| Rottweil P 806*² | <<locked>> | 76% | 15,026 psi | 77% | 971 fps | 87.1% |
| SNPE Vectan A0² | <<locked>> | 60% | 15,185 psi | 78% | 840 fps | 95.4% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 64% | 13,953 psi | 71% | 830 fps | 85.7% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 13,605 psi | 69% | 850 fps | 86.8% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 9,747 psi | 50% | 673 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 15,998 psi | 82% | 876 fps | 96.7% |
| Vihtavuori N350*² | <<locked>> | 64% | 13,402 psi | 68% | 843 fps | 87% |
| Winchester AutoComp ² | <<locked>> | 60% | 14,968 psi | 76% | 846 fps | 98.9% |
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 16 powders for 9 mm Steyr loaded with the .357 | 147gr | H&N KS HS. Rottweil P 806 delivers the highest muzzle velocity at 1,027 fps; across all powders the maximum-charge window runs from 745 fps to 1,027 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 4 of the 16 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (135 MPa), the top charges use 59–90 %, leaving at least 10 % 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 | 147gr | H&N KS HS 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, Alliant UNIQUE, Baschieri & Pellagri 102 Pistol 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.