Load Specifications
Load data in caliber 9 mm Steyr with .357 | 147gr | H&N HP HS bullet and 18 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N32C Tin Star, Hodgdon TrailBoss and ReloadSwiss RS 14.
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 |
|---|---|---|---|---|---|---|
| Accurate Solo 1250² | <<locked>> | 64% | 17,274 psi | 88% | 876 fps | 99.9% |
| Alliant BE-86² | <<locked>> | 64% | 17,216 psi | 88% | 876 fps | 100% |
| Alliant Herco² | <<locked>> | 76% | 17,013 psi | 87% | 906 fps | 96.9% |
| Alliant UNIQUE² | <<locked>> | 64% | 17,274 psi | 88% | 909 fps | 97% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 76% | 16,607 psi | 85% | 856 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,589 psi | 64% | 738 fps | 100% |
| Maxam CSB 1² | <<locked>> | 64% | 15,780 psi | 81% | 840 fps | 99.6% |
| Maxam CSB 2² | <<locked>> | 64% | 16,041 psi | 82% | 873 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 10,994 psi | 56% | 725 fps | 99.9% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 17,143 psi | 88% | 925 fps | 98.7% |
| Rottweil P 806* | <<locked>> | 80% | 16,041 psi | 82% | 991 fps | 87.9% |
| SNPE Vectan A0² | <<locked>> | 64% | 16,041 psi | 82% | 850 fps | 95.8% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 72% | 16,650 psi | 85% | 886 fps | 88.4% |
| Vihtavuori 3N37*² | <<locked>> | 68% | 17,042 psi | 87% | 922 fps | 90.4% |
| Vihtavuori N32C Tin Star | <<locked>> | 84% | 16,636 psi | 85% | 801 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 16,897 psi | 86% | 886 fps | 97% |
| Vihtavuori N350*² | <<locked>> | 72% | 16,201 psi | 83% | 902 fps | 90% |
| Winchester AutoComp ² | <<locked>> | 64% | 16,462 psi | 84% | 869 fps | 99.4% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate Solo 1250² | <<locked>> | 60% | 15,577 psi | 80% | 843 fps | 99.5% |
| Alliant BE-86² | <<locked>> | 60% | 15,650 psi | 80% | 846 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 10,979 psi | 56% | 751 fps | 90.5% |
| Alliant UNIQUE² | <<locked>> | 60% | 14,939 psi | 76% | 860 fps | 95.2% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,617 psi | 54% | 728 fps | 99.9% |
| Hodgdon TrailBoss² | 1.9 gr | 60% | 5,845 psi | 30% | 535 fps | 97.5% |
| Maxam CSB 1² | <<locked>> | 60% | 14,199 psi | 73% | 807 fps | 99% |
| Maxam CSB 2² | <<locked>> | 60% | 14,417 psi | 74% | 843 fps | 100% |
| ReloadSwiss RS 14*² | 1.9 gr | 60% | 5,381 psi | 27% | 522 fps | 92.2% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 13,489 psi | 69% | 843 fps | 96.1% |
| Rottweil P 806*² | <<locked>> | 76% | 13,953 psi | 71% | 938 fps | 85.1% |
| SNPE Vectan A0*² | <<locked>> | 60% | 14,562 psi | 74% | 817 fps | 94.5% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 15,389 psi | 79% | 856 fps | 87% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 13,169 psi | 67% | 830 fps | 85.7% |
| Vihtavuori N32C Tin Star² | 2.6 gr | 60% | 9,514 psi | 49% | 663 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 15,345 psi | 78% | 853 fps | 95.9% |
| Vihtavuori N350*² | <<locked>> | 64% | 12,981 psi | 66% | 823 fps | 85.8% |
| Winchester AutoComp ² | <<locked>> | 60% | 15,098 psi | 77% | 843 fps | 98.8% |
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 18 powders for 9 mm Steyr loaded with the .357 | 147gr | H&N HP HS. Rottweil P 806 delivers the highest muzzle velocity at 991 fps; across all powders the maximum-charge window runs from 725 fps to 991 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 4 of the 18 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (135 MPa), the top charges use 56–88 %, leaving at least 12 % 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. Vihtavuori N32C Tin Star, Hodgdon TrailBoss, ReloadSwiss RS 14 rank at the top here: for 9 mm Steyr with the .357 | 147gr | H&N HP 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. Accurate Solo 1250, Alliant BE-86, Alliant Herco 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.