Load Specifications
Load data in caliber 9 mm Steyr with .355 | 115gr | Geco FMJ bullet and 16 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% | 15,998 psi | 82% | 1007 fps | 98.6% |
| Alliant BE-86² | <<locked>> | 64% | 16,621 psi | 85% | 1027 fps | 99.9% |
| Alliant Herco*² | <<locked>> | 76% | 16,027 psi | 82% | 1040 fps | 93.8% |
| Alliant UNIQUE*² | <<locked>> | 64% | 16,244 psi | 83% | 1047 fps | 93.9% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 17,187 psi | 88% | 1030 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 11,487 psi | 59% | 850 fps | 100% |
| Maxam CSB 1² | <<locked>> | 68% | 17,419 psi | 89% | 1037 fps | 99.2% |
| Maxam CSB 2² | <<locked>> | 68% | 17,463 psi | 89% | 1073 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 10,443 psi | 53% | 843 fps | 98.6% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 16,273 psi | 83% | 1070 fps | 96.2% |
| SNPE Vectan A0*² | <<locked>> | 68% | 17,216 psi | 88% | 1033 fps | 94.4% |
| Somchem MS200² | <<locked>> | 64% | 17,129 psi | 87% | 1043 fps | 95.6% |
| Vihtavuori N32C Tin Star | <<locked>> | 88% | 17,405 psi | 89% | 974 fps | 100% |
| Vihtavuori N340*² | <<locked>> | 64% | 16,491 psi | 84% | 1037 fps | 94.5% |
| Vihtavuori N350*² | <<locked>> | 76% | 17,172 psi | 88% | 1083 fps | 87.7% |
| Winchester AutoComp ² | <<locked>> | 68% | 17,651 psi | 90% | 1056 fps | 98.6% |
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% | 14,649 psi | 75% | 974 fps | 97.8% |
| Alliant BE-86² | <<locked>> | 60% | 14,779 psi | 75% | 981 fps | 99.4% |
| Alliant Herco*² | <<locked>> | 60% | 10,689 psi | 55% | 873 fps | 86.6% |
| Alliant UNIQUE*² | <<locked>> | 60% | 14,402 psi | 74% | 997 fps | 91.9% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,008 psi | 51% | 843 fps | 98.7% |
| Hodgdon TrailBoss*² | 2.2 gr | 60% | 5,439 psi | 28% | 614 fps | 94.2% |
| Maxam CSB 1² | <<locked>> | 60% | 13,474 psi | 69% | 938 fps | 96.9% |
| Maxam CSB 2² | <<locked>> | 60% | 13,343 psi | 68% | 974 fps | 99.8% |
| ReloadSwiss RS 14*² | 2.3 gr | 60% | 5,279 psi | 27% | 610 fps | 88.7% |
| ReloadSwiss RS 20*² | <<locked>> | 60% | 12,807 psi | 65% | 971 fps | 92.4% |
| SNPE Vectan A0*² | <<locked>> | 60% | 14,127 psi | 72% | 951 fps | 91.3% |
| Somchem MS200*² | <<locked>> | 60% | 15,229 psi | 78% | 994 fps | 94% |
| Vihtavuori N32C Tin Star² | 3 gr | 60% | 8,644 psi | 44% | 761 fps | 100% |
| Vihtavuori N340*² | <<locked>> | 60% | 14,562 psi | 74% | 984 fps | 92.5% |
| Vihtavuori N350*² | <<locked>> | 72% | 15,418 psi | 79% | 1037 fps | 85.6% |
| Winchester AutoComp ² | <<locked>> | 60% | 14,141 psi | 72% | 968 fps | 96.4% |
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 .355 | 115gr | Geco FMJ. Vihtavuori N350 delivers the highest muzzle velocity at 1,083 fps; across all powders the maximum-charge window runs from 843 fps to 1,083 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 53–90 %, 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. Vihtavuori N32C Tin Star, Hodgdon TrailBoss, ReloadSwiss RS 14 rank at the top here: for 9 mm Steyr with the .355 | 115gr | Geco FMJ they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Herco, Alliant UNIQUE, SNPE Vectan A0 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.