Load Specifications
Load data in caliber 9 mm Steyr with .358 | 158gr | Speer LRN bullet and 19 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% | 15,809 psi | 81% | 817 fps | 99.8% |
| Alliant BE-86² | <<locked>> | 64% | 16,636 psi | 85% | 833 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 17,027 psi | 87% | 879 fps | 97.7% |
| Alliant UNIQUE² | <<locked>> | 68% | 17,289 psi | 88% | 883 fps | 97.7% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 16,882 psi | 86% | 830 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 10,805 psi | 55% | 682 fps | 100% |
| Maxam CSB 1² | <<locked>> | 68% | 16,853 psi | 86% | 833 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 16,868 psi | 86% | 860 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 9,558 psi | 49% | 676 fps | 99.6% |
| ReloadSwiss RS 20² | <<locked>> | 72% | 17,666 psi | 90% | 906 fps | 99.4% |
| Rottweil P 806* | <<locked>> | 84% | 17,042 psi | 87% | 981 fps | 90.4% |
| SNPE Vectan A0² | <<locked>> | 68% | 17,245 psi | 88% | 843 fps | 97.4% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 72% | 15,635 psi | 80% | 837 fps | 88.5% |
| Somchem MS200² | <<locked>> | 64% | 17,535 psi | 90% | 863 fps | 98.4% |
| Vihtavuori 3N37*² | <<locked>> | 68% | 15,983 psi | 82% | 869 fps | 90.5% |
| Vihtavuori N32C Tin Star | <<locked>> | 88% | 16,534 psi | 84% | 774 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 16,375 psi | 84% | 846 fps | 97.4% |
| Vihtavuori N350*² | <<locked>> | 76% | 17,492 psi | 89% | 899 fps | 92.4% |
| Winchester AutoComp ² | <<locked>> | 68% | 17,405 psi | 89% | 860 fps | 99.9% |
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% | 14,040 psi | 72% | 781 fps | 99.3% |
| Alliant BE-86² | <<locked>> | 60% | 14,185 psi | 72% | 791 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 9,848 psi | 50% | 705 fps | 89.8% |
| Alliant UNIQUE² | <<locked>> | 60% | 13,982 psi | 71% | 814 fps | 95.3% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 9,602 psi | 49% | 686 fps | 99.9% |
| Hodgdon TrailBoss*² | 1.8 gr | 60% | 4,453 psi | 23% | 482 fps | 94.8% |
| Maxam CSB 1² | <<locked>> | 60% | 13,431 psi | 69% | 764 fps | 99.1% |
| Maxam CSB 2² | <<locked>> | 60% | 13,256 psi | 68% | 794 fps | 100% |
| ReloadSwiss RS 14*² | 1.9 gr | 60% | 4,163 psi | 21% | 476 fps | 88.8% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 12,169 psi | 62% | 784 fps | 95.6% |
| Rottweil P 806* | <<locked>> | 80% | 14,460 psi | 74% | 925 fps | 87.4% |
| SNPE Vectan A0*² | <<locked>> | 60% | 14,011 psi | 72% | 778 fps | 94.8% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 14,286 psi | 73% | 807 fps | 86.9% |
| Somchem MS200² | <<locked>> | 60% | 14,982 psi | 77% | 810 fps | 96.9% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 11,922 psi | 61% | 774 fps | 85.1% |
| Vihtavuori N32C Tin Star² | 2.5 gr | 60% | 8,151 psi | 42% | 617 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 13,880 psi | 71% | 797 fps | 95.5% |
| Vihtavuori N350*² | <<locked>> | 64% | 11,792 psi | 60% | 768 fps | 85.2% |
| Winchester AutoComp ² | <<locked>> | 60% | 13,576 psi | 69% | 784 fps | 98.5% |
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 19 powders for 9 mm Steyr loaded with the .358 | 158gr | Speer LRN. Rottweil P 806 delivers the highest muzzle velocity at 981 fps; across all powders the maximum-charge window runs from 676 fps to 981 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 6 of the 19 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (135 MPa), the top charges use 49–90 %, 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 .358 | 158gr | Speer LRN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Rottweil P 806, SNPE Vectan BA7 1/2, Vihtavuori 3N37 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.