Load Specifications
Load data in caliber 9 mm Steyr with .357 | 135gr | Speer HPSB GD bullet and 13 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are 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 |
|---|---|---|---|---|---|---|
| Alliant Herco² | <<locked>> | 72% | 16,085 psi | 82% | 958 fps | 96.3% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 72% | 15,867 psi | 81% | 912 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,836 psi | 66% | 804 fps | 100% |
| Maxam CSB 1² | <<locked>> | 64% | 17,085 psi | 87% | 938 fps | 99.9% |
| Maxam CSB 2² | <<locked>> | 64% | 17,535 psi | 90% | 974 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,763 psi | 60% | 804 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 64% | 16,302 psi | 83% | 981 fps | 98.3% |
| SNPE Vectan A0² | <<locked>> | 64% | 17,608 psi | 90% | 955 fps | 97% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 16,505 psi | 84% | 955 fps | 88.4% |
| Vihtavuori 3N37*² | <<locked>> | 64% | 16,302 psi | 83% | 978 fps | 89.7% |
| Vihtavuori N32C Tin Star | <<locked>> | 80% | 16,476 psi | 84% | 866 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 72% | 17,419 psi | 89% | 1004 fps | 91.3% |
| Winchester AutoComp ² | <<locked>> | 64% | 17,651 psi | 90% | 968 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% | 11,893 psi | 61% | 843 fps | 91.7% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 11,269 psi | 58% | 804 fps | 100% |
| Hodgdon TrailBoss² | 2.2 gr | 60% | 5,990 psi | 31% | 584 fps | 97.7% |
| Maxam CSB 1² | <<locked>> | 60% | 15,650 psi | 80% | 909 fps | 99.6% |
| Maxam CSB 2² | <<locked>> | 60% | 16,041 psi | 82% | 942 fps | 100% |
| ReloadSwiss RS 14*² | 2.3 gr | 60% | 5,816 psi | 30% | 584 fps | 93.4% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 14,388 psi | 73% | 935 fps | 96.9% |
| SNPE Vectan A0² | <<locked>> | 60% | 15,621 psi | 80% | 912 fps | 95.5% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 64% | 14,344 psi | 73% | 902 fps | 85.7% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 14,040 psi | 72% | 919 fps | 86.9% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 9,761 psi | 50% | 719 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 64% | 13,895 psi | 71% | 915 fps | 87.2% |
| Winchester AutoComp ² | <<locked>> | 60% | 15,795 psi | 81% | 925 fps | 99.1% |
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 13 powders for 9 mm Steyr loaded with the .357 | 135gr | Speer HPSB GD. Vihtavuori N350 delivers the highest muzzle velocity at 1,004 fps; across all powders the maximum-charge window runs from 804 fps to 1,004 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 3 of the 13 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (135 MPa), the top charges use 60–90 %, 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. Hodgdon TrailBoss, ReloadSwiss RS 14 rank at the top here: for 9 mm Steyr with the .357 | 135gr | Speer HPSB GD they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, SNPE Vectan BA7 1/2, Vihtavuori 3N37, Vihtavuori N350 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.