Load Specifications
Load data in caliber 9 mm Steyr with .356 | 145gr | LOS HP bullet and 10 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 14 and Hodgdon TrailBoss.
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 Herco² | <<locked>> | 72% | 17,405 psi | 89% | 906 fps | 97.2% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 72% | 17,463 psi | 89% | 866 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 14,489 psi | 74% | 764 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 13,735 psi | 70% | 774 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 64% | 17,013 psi | 87% | 922 fps | 98.7% |
| Rottweil P 806*² | <<locked>> | 76% | 17,492 psi | 89% | 1017 fps | 89.5% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 17,216 psi | 88% | 899 fps | 89.2% |
| Vihtavuori 3N37*² | <<locked>> | 64% | 17,114 psi | 87% | 922 fps | 90.6% |
| Vihtavuori N32C Tin Star² | <<locked>> | 76% | 16,302 psi | 83% | 787 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 68% | 16,824 psi | 86% | 915 fps | 90.8% |
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% | 13,285 psi | 68% | 807 fps | 93.7% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 12,937 psi | 66% | 774 fps | 100% |
| Hodgdon TrailBoss² | 2 gr | 60% | 7,760 psi | 40% | 577 fps | 99.7% |
| ReloadSwiss RS 14² | 2 gr | 60% | 7,382 psi | 38% | 571 fps | 97.1% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 15,664 psi | 80% | 892 fps | 98% |
| Rottweil P 806*² | <<locked>> | 72% | 15,519 psi | 79% | 968 fps | 87.2% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 60% | 13,880 psi | 71% | 814 fps | 85.2% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 15,273 psi | 78% | 879 fps | 88.6% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 11,690 psi | 60% | 692 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 60% | 13,329 psi | 68% | 827 fps | 86.5% |
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 2 powders for 9 mm Steyr loaded with the .356 | 145gr | LOS HP. ReloadSwiss RS 14 delivers the highest muzzle velocity at 774 fps; across all powders the maximum-charge window runs from 764 fps to 774 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 2 of the 2 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (135 MPa), the top charges use 70–74 %, leaving at least 26 % 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. ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 9 mm Steyr with the .356 | 145gr | LOS HP they combine a high case fill with complete burn and sit in the upper velocity band. Hodgdon TrailBoss, ReloadSwiss RS 14 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.