Load Specifications
Load data in caliber 9 mm Steyr with .355 | 154gr | Geco FMJ FLAT NOSE 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% | 17,013 psi | 87% | 840 fps | 99.9% |
| Alliant BE-86² | <<locked>> | 64% | 17,129 psi | 87% | 843 fps | 100% |
| Alliant Herco² | <<locked>> | 76% | 16,360 psi | 84% | 860 fps | 96.7% |
| Alliant UNIQUE² | <<locked>> | 64% | 17,071 psi | 87% | 873 fps | 97.1% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 76% | 16,592 psi | 85% | 827 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,256 psi | 63% | 705 fps | 100% |
| Maxam CSB 1² | <<locked>> | 64% | 16,302 psi | 83% | 820 fps | 99.8% |
| Maxam CSB 2² | <<locked>> | 64% | 16,621 psi | 85% | 853 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,269 psi | 58% | 705 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 17,143 psi | 88% | 892 fps | 98.9% |
| Rottweil P 806* | <<locked>> | 80% | 15,679 psi | 80% | 951 fps | 88% |
| SNPE Vectan A0² | <<locked>> | 64% | 16,679 psi | 85% | 830 fps | 96.5% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 72% | 16,868 psi | 86% | 860 fps | 89% |
| Vihtavuori 3N37*² | <<locked>> | 68% | 16,549 psi | 85% | 879 fps | 90.3% |
| Vihtavuori N32C Tin Star | <<locked>> | 84% | 16,331 psi | 83% | 768 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 16,810 psi | 86% | 853 fps | 97.2% |
| Vihtavuori N350*² | <<locked>> | 72% | 16,331 psi | 83% | 873 fps | 90.6% |
| Winchester AutoComp ² | <<locked>> | 64% | 16,462 psi | 84% | 840 fps | 99.5% |
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% | 15,200 psi | 78% | 804 fps | 99.5% |
| Alliant BE-86² | <<locked>> | 60% | 15,519 psi | 79% | 814 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 10,805 psi | 55% | 722 fps | 90.6% |
| Alliant UNIQUE² | <<locked>> | 60% | 14,721 psi | 75% | 823 fps | 95.3% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,341 psi | 53% | 696 fps | 99.9% |
| Hodgdon TrailBoss² | 1.8 gr | 60% | 5,802 psi | 30% | 515 fps | 97.7% |
| Maxam CSB 1² | <<locked>> | 60% | 14,634 psi | 75% | 787 fps | 99.3% |
| Maxam CSB 2² | <<locked>> | 60% | 14,881 psi | 76% | 820 fps | 100% |
| ReloadSwiss RS 14*² | 1.8 gr | 60% | 5,352 psi | 27% | 502 fps | 92.5% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 13,329 psi | 68% | 810 fps | 96.3% |
| Rottweil P 806*² | <<locked>> | 76% | 14,025 psi | 72% | 912 fps | 85.8% |
| SNPE Vectan A0*² | <<locked>> | 60% | 14,344 psi | 73% | 781 fps | 94.5% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 64% | 13,648 psi | 70% | 787 fps | 85.1% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 13,184 psi | 67% | 801 fps | 86.2% |
| Vihtavuori N32C Tin Star² | 2.4 gr | 60% | 9,065 psi | 46% | 623 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 15,185 psi | 78% | 820 fps | 96% |
| Vihtavuori N350*² | <<locked>> | 64% | 12,995 psi | 66% | 794 fps | 86.3% |
| Winchester AutoComp ² | <<locked>> | 60% | 14,968 psi | 76% | 810 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 3 powders for 9 mm Steyr loaded with the .355 | 154gr | Geco FMJ FLAT NOSE. Vihtavuori N32C Tin Star delivers the highest muzzle velocity at 768 fps; across all powders the maximum-charge window runs from 705 fps to 768 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 3 of the 3 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (135 MPa), the top charges use 58–83 %, leaving at least 17 % 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 .355 | 154gr | Geco FMJ FLAT NOSE they combine a high case fill with complete burn and sit in the upper velocity band. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori N32C Tin Star 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.