Load Specifications
Load data in caliber 9 mm Steyr with .355 | 115gr | Norma HP bullet and 11 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 Herco*² | <<locked>> | 72% | 16,186 psi | 83% | 1070 fps | 94.9% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 76% | 17,376 psi | 89% | 1056 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,894 psi | 66% | 906 fps | 100% |
| Maxam CSB 1² | <<locked>> | 64% | 17,303 psi | 88% | 1060 fps | 99.6% |
| Maxam CSB 2² | <<locked>> | 64% | 17,651 psi | 90% | 1093 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,719 psi | 60% | 899 fps | 99.7% |
| ReloadSwiss RS 20² | <<locked>> | 64% | 15,983 psi | 82% | 1089 fps | 97% |
| SNPE Vectan A0² | <<locked>> | 64% | 17,434 psi | 89% | 1066 fps | 95.7% |
| Vihtavuori N32C Tin Star | <<locked>> | 84% | 17,419 psi | 89% | 994 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 72% | 17,477 psi | 89% | 1122 fps | 89.5% |
| Winchester AutoComp ² | <<locked>> | 64% | 17,695 psi | 90% | 1083 fps | 99.2% |
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% | 11,661 psi | 60% | 928 fps | 89.6% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 11,182 psi | 57% | 899 fps | 99.8% |
| Hodgdon TrailBoss² | 2.6 gr | 60% | 6,121 psi | 31% | 663 fps | 96.8% |
| Maxam CSB 1² | <<locked>> | 60% | 15,476 psi | 79% | 1014 fps | 98.9% |
| Maxam CSB 2² | <<locked>> | 60% | 15,679 psi | 80% | 1050 fps | 100% |
| ReloadSwiss RS 14*² | 2.6 gr | 60% | 5,642 psi | 29% | 643 fps | 91.2% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 14,330 psi | 73% | 1043 fps | 95.4% |
| SNPE Vectan A0*² | <<locked>> | 60% | 15,171 psi | 77% | 1007 fps | 93.7% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 9,848 psi | 50% | 814 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 68% | 15,853 psi | 81% | 1076 fps | 87.7% |
| Winchester AutoComp ² | <<locked>> | 60% | 15,548 psi | 79% | 1030 fps | 98.2% |
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 11 powders for 9 mm Steyr loaded with the .355 | 115gr | Norma HP. Vihtavuori N350 delivers the highest muzzle velocity at 1,122 fps; across all powders the maximum-charge window runs from 899 fps to 1,122 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 3 of the 11 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 .355 | 115gr | Norma HP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Herco, 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.