Load Specifications
Load data in caliber 9 mm Steyr with .355 | 140gr | 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% | 17,027 psi | 87% | 899 fps | 99.8% |
| Alliant BE-86² | <<locked>> | 64% | 17,651 psi | 90% | 912 fps | 100% |
| Alliant Herco² | <<locked>> | 76% | 16,592 psi | 85% | 925 fps | 96.2% |
| Alliant UNIQUE² | <<locked>> | 64% | 16,926 psi | 86% | 932 fps | 96.3% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 76% | 16,215 psi | 83% | 879 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 11,864 psi | 61% | 748 fps | 100% |
| Maxam CSB 1² | <<locked>> | 64% | 15,577 psi | 80% | 866 fps | 99.4% |
| Maxam CSB 2² | <<locked>> | 64% | 15,737 psi | 80% | 899 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 10,878 psi | 56% | 748 fps | 99.7% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 16,708 psi | 85% | 948 fps | 98.2% |
| SNPE Vectan A0² | <<locked>> | 64% | 15,751 psi | 80% | 869 fps | 95% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 72% | 16,810 psi | 86% | 919 fps | 87.9% |
| Vihtavuori 3N37*² | <<locked>> | 68% | 16,505 psi | 84% | 938 fps | 89.2% |
| Vihtavuori N32C Tin Star | <<locked>> | 84% | 16,360 psi | 84% | 827 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 16,563 psi | 85% | 909 fps | 96.3% |
| Vihtavuori N350*² | <<locked>> | 72% | 16,389 psi | 84% | 935 fps | 89.5% |
| Winchester AutoComp ² | <<locked>> | 64% | 16,128 psi | 82% | 892 fps | 99% |
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% | 14,605 psi | 75% | 850 fps | 98.9% |
| Alliant BE-86² | <<locked>> | 60% | 15,360 psi | 78% | 869 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 10,849 psi | 55% | 771 fps | 89.5% |
| Alliant UNIQUE*² | <<locked>> | 60% | 14,736 psi | 75% | 883 fps | 94.5% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,472 psi | 53% | 751 fps | 99.8% |
| Hodgdon TrailBoss² | 1.9 gr | 60% | 5,584 psi | 29% | 541 fps | 96.5% |
| Maxam CSB 1² | <<locked>> | 60% | 14,069 psi | 72% | 833 fps | 98.7% |
| Maxam CSB 2² | <<locked>> | 60% | 14,170 psi | 72% | 866 fps | 100% |
| ReloadSwiss RS 14*² | 2 gr | 60% | 5,453 psi | 28% | 541 fps | 91.8% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 13,256 psi | 68% | 863 fps | 95.3% |
| SNPE Vectan A0*² | <<locked>> | 60% | 14,359 psi | 73% | 837 fps | 93.7% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 14,997 psi | 77% | 876 fps | 85.8% |
| Vihtavuori 3N37*² | <<locked>> | 64% | 14,591 psi | 75% | 892 fps | 86.9% |
| Vihtavuori N32C Tin Star² | 2.6 gr | 60% | 8,978 psi | 46% | 669 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 15,069 psi | 77% | 876 fps | 95.1% |
| Vihtavuori N350*² | <<locked>> | 68% | 14,431 psi | 74% | 886 fps | 87.1% |
| Winchester AutoComp ² | <<locked>> | 60% | 14,779 psi | 75% | 863 fps | 98.3% |
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 | 140gr | ALSA PRO FMJ. ReloadSwiss RS 20 delivers the highest muzzle velocity at 948 fps; across all powders the maximum-charge window runs from 748 fps to 948 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 3 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 56–90 %, 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 | 140gr | ALSA PRO FMJ 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. 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.