Load Specifications
Load data in caliber 9 mm Steyr with .355 | 124gr | ALSA PRO FMJ bullet and 17 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% | 16,375 psi | 84% | 968 fps | 99.1% |
| Alliant BE-86² | <<locked>> | 64% | 16,607 psi | 85% | 974 fps | 100% |
| Alliant Herco*² | <<locked>> | 76% | 16,157 psi | 83% | 994 fps | 94.7% |
| Alliant UNIQUE*² | <<locked>> | 64% | 16,114 psi | 82% | 994 fps | 94.5% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 17,274 psi | 88% | 978 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 11,632 psi | 59% | 810 fps | 100% |
| Maxam CSB 1² | <<locked>> | 68% | 17,202 psi | 88% | 981 fps | 99.5% |
| Maxam CSB 2² | <<locked>> | 68% | 17,318 psi | 88% | 1014 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 10,617 psi | 54% | 807 fps | 99.1% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 16,317 psi | 83% | 1020 fps | 97% |
| SNPE Vectan A0*² | <<locked>> | 64% | 15,751 psi | 80% | 945 fps | 93.8% |
| Somchem MS200² | <<locked>> | 64% | 17,695 psi | 90% | 1004 fps | 96.6% |
| Vihtavuori 3N37*² | <<locked>> | 68% | 16,317 psi | 83% | 1010 fps | 87.3% |
| Vihtavuori N32C Tin Star | <<locked>> | 88% | 17,187 psi | 88% | 919 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 16,404 psi | 84% | 984 fps | 95.1% |
| Vihtavuori N350*² | <<locked>> | 76% | 17,564 psi | 90% | 1040 fps | 89.1% |
| Winchester AutoComp ² | <<locked>> | 64% | 15,853 psi | 81% | 965 fps | 98.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate Solo 1250² | <<locked>> | 60% | 14,939 psi | 76% | 932 fps | 98.4% |
| Alliant BE-86² | <<locked>> | 60% | 15,258 psi | 78% | 945 fps | 99.8% |
| Alliant Herco*² | <<locked>> | 60% | 10,501 psi | 54% | 827 fps | 87.3% |
| Alliant UNIQUE*² | <<locked>> | 60% | 14,808 psi | 76% | 958 fps | 93.2% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,182 psi | 52% | 807 fps | 99.2% |
| Hodgdon TrailBoss² | 2.1 gr | 60% | 5,555 psi | 28% | 587 fps | 95.3% |
| Maxam CSB 1² | <<locked>> | 60% | 13,735 psi | 70% | 896 fps | 97.7% |
| Maxam CSB 2² | <<locked>> | 60% | 13,677 psi | 70% | 932 fps | 100% |
| ReloadSwiss RS 14*² | 2.2 gr | 60% | 5,410 psi | 28% | 587 fps | 90.1% |
| ReloadSwiss RS 20*² | <<locked>> | 60% | 12,633 psi | 65% | 919 fps | 93.2% |
| SNPE Vectan A0*² | <<locked>> | 60% | 13,851 psi | 71% | 896 fps | 91.8% |
| Somchem MS200² | <<locked>> | 60% | 15,621 psi | 80% | 955 fps | 95% |
| Vihtavuori 3N37*² | <<locked>> | 64% | 14,591 psi | 75% | 968 fps | 85.2% |
| Vihtavuori N32C Tin Star² | 2.9 gr | 60% | 9,079 psi | 46% | 735 fps | 100% |
| Vihtavuori N340*² | <<locked>> | 60% | 14,388 psi | 73% | 932 fps | 93.2% |
| Vihtavuori N350*² | <<locked>> | 72% | 15,635 psi | 80% | 994 fps | 87% |
| Winchester AutoComp ² | <<locked>> | 60% | 14,054 psi | 72% | 919 fps | 97% |
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 17 powders for 9 mm Steyr loaded with the .355 | 124gr | ALSA PRO FMJ. Vihtavuori N350 delivers the highest muzzle velocity at 1,040 fps; across all powders the maximum-charge window runs from 807 fps to 1,040 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 4 of the 17 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (135 MPa), the top charges use 54–90 %, 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 | 124gr | ALSA PRO 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.