Load Specifications
Load data in caliber 9 mm Steyr with .358 | 158gr | LEE Mold TL358-158-SWC bullet and 20 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% | 16,491 psi | 84% | 833 fps | 100% |
| Alliant BE-86² | <<locked>> | 64% | 16,375 psi | 84% | 833 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 17,550 psi | 90% | 889 fps | 98% |
| Alliant UNIQUE² | <<locked>> | 64% | 16,186 psi | 83% | 863 fps | 97.1% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 17,448 psi | 89% | 840 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 64% | 17,593 psi | 90% | 860 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 11,327 psi | 58% | 692 fps | 100% |
| Maxam CSB 1² | <<locked>> | 68% | 17,521 psi | 89% | 846 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 17,593 psi | 90% | 873 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 9,427 psi | 48% | 673 fps | 99.6% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 16,520 psi | 84% | 886 fps | 99% |
| Rottweil P 806* | <<locked>> | 84% | 16,708 psi | 85% | 978 fps | 90.1% |
| SNPE Vectan A0² | <<locked>> | 64% | 15,360 psi | 78% | 807 fps | 96.1% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 72% | 16,070 psi | 82% | 850 fps | 89.1% |
| Somchem MS200² | <<locked>> | 64% | 17,260 psi | 88% | 860 fps | 98.4% |
| Vihtavuori 3N37*² | <<locked>> | 68% | 15,722 psi | 80% | 866 fps | 90.4% |
| Vihtavuori N32C Tin Star | <<locked>> | 88% | 17,231 psi | 88% | 784 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 16,099 psi | 82% | 843 fps | 97.3% |
| Vihtavuori N350*² | <<locked>> | 72% | 15,606 psi | 80% | 863 fps | 90.7% |
| Winchester AutoComp ² | <<locked>> | 64% | 15,548 psi | 79% | 827 fps | 99.5% |
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% | 14,678 psi | 75% | 797 fps | 99.6% |
| Alliant BE-86² | <<locked>> | 60% | 14,736 psi | 75% | 804 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 9,718 psi | 50% | 702 fps | 89.6% |
| Alliant UNIQUE² | <<locked>> | 60% | 13,779 psi | 70% | 810 fps | 95.1% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 9,485 psi | 48% | 682 fps | 99.8% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 15,896 psi | 81% | 830 fps | 99.8% |
| Hodgdon TrailBoss*² | 1.8 gr | 60% | 4,409 psi | 23% | 479 fps | 94.8% |
| Maxam CSB 1² | <<locked>> | 60% | 13,242 psi | 68% | 764 fps | 99% |
| Maxam CSB 2² | <<locked>> | 60% | 13,082 psi | 67% | 791 fps | 100% |
| ReloadSwiss RS 14*² | 1.9 gr | 60% | 4,134 psi | 21% | 476 fps | 88.7% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 12,662 psi | 65% | 801 fps | 96.3% |
| Rottweil P 806* | <<locked>> | 80% | 14,794 psi | 76% | 935 fps | 87.9% |
| SNPE Vectan A0*² | <<locked>> | 60% | 13,822 psi | 71% | 774 fps | 94.7% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 14,069 psi | 72% | 804 fps | 86.7% |
| Somchem MS200² | <<locked>> | 60% | 15,563 psi | 79% | 823 fps | 97.4% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 12,343 psi | 63% | 787 fps | 85.9% |
| Vihtavuori N32C Tin Star² | 2.5 gr | 60% | 8,050 psi | 41% | 614 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 14,446 psi | 74% | 810 fps | 96.1% |
| Vihtavuori N350*² | <<locked>> | 64% | 12,227 psi | 62% | 781 fps | 86.1% |
| Winchester AutoComp ² | <<locked>> | 60% | 13,387 psi | 68% | 781 fps | 98.4% |
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 3 powders for 9 mm Steyr loaded with the .358 | 158gr | LEE Mold TL358-158-SWC. Vihtavuori N32C Tin Star delivers the highest muzzle velocity at 784 fps; across all powders the maximum-charge window runs from 673 fps to 784 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 3 of the 3 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (135 MPa), the top charges use 48–88 %, leaving at least 12 % 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 | LEE Mold TL358-158-SWC they combine a high case fill with complete burn and sit in the upper velocity band. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori N32C Tin Star 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.