Load Specifications
Load data in caliber 9 mm Steyr with .358 | 158gr | Speer LSWC bullet and 18 powders. The key underlying parameters are shown in the table above.
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% | 16,230 psi | 83% | 830 fps | 99.9% |
| Alliant BE-86² | <<locked>> | 64% | 16,940 psi | 87% | 843 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 17,274 psi | 88% | 886 fps | 98% |
| Alliant UNIQUE² | <<locked>> | 68% | 17,637 psi | 90% | 896 fps | 98.1% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 17,158 psi | 88% | 840 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 11,182 psi | 57% | 692 fps | 100% |
| Maxam CSB 1² | <<locked>> | 68% | 17,274 psi | 88% | 843 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 17,347 psi | 89% | 869 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 9,877 psi | 50% | 686 fps | 99.8% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 16,273 psi | 83% | 883 fps | 99% |
| Rottweil P 806* | <<locked>> | 84% | 17,042 psi | 87% | 984 fps | 90.6% |
| SNPE Vectan A0² | <<locked>> | 68% | 17,550 psi | 90% | 853 fps | 97.7% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 72% | 16,520 psi | 84% | 860 fps | 89.7% |
| Vihtavuori 3N37*² | <<locked>> | 68% | 16,172 psi | 83% | 879 fps | 91% |
| Vihtavuori N32C Tin Star | <<locked>> | 88% | 16,940 psi | 87% | 784 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 16,708 psi | 85% | 860 fps | 97.8% |
| Vihtavuori N350*² | <<locked>> | 76% | 17,666 psi | 90% | 906 fps | 92.8% |
| Winchester AutoComp ² | <<locked>> | 68% | 17,666 psi | 90% | 866 fps | 99.9% |
Start Load - Barrel Length: 5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate Solo 1250² | <<locked>> | 60% | 14,460 psi | 74% | 794 fps | 99.6% |
| Alliant BE-86² | <<locked>> | 60% | 14,518 psi | 74% | 801 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 10,124 psi | 52% | 715 fps | 90.5% |
| Alliant UNIQUE² | <<locked>> | 60% | 14,344 psi | 73% | 823 fps | 95.8% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 9,355 psi | 48% | 682 fps | 99.8% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 4,757 psi | 24% | 495 fps | 95.9% |
| Maxam CSB 1² | <<locked>> | 60% | 13,837 psi | 71% | 778 fps | 99.4% |
| Maxam CSB 2² | <<locked>> | 60% | 13,735 psi | 70% | 807 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 60% | 4,105 psi | 21% | 476 fps | 88.7% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 12,488 psi | 64% | 797 fps | 96.2% |
| Rottweil P 806*² | <<locked>> | 76% | 12,850 psi | 66% | 889 fps | 85.2% |
| SNPE Vectan A0*² | <<locked>> | 60% | 13,605 psi | 69% | 771 fps | 94.6% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 14,489 psi | 74% | 814 fps | 87.4% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 12,154 psi | 62% | 784 fps | 85.7% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 7,948 psi | 41% | 610 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 14,243 psi | 73% | 807 fps | 96% |
| Vihtavuori N350*² | <<locked>> | 64% | 12,009 psi | 61% | 778 fps | 85.9% |
| Winchester AutoComp ² | <<locked>> | 60% | 13,866 psi | 71% | 794 fps | 98.8% |
* 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 18 powders for 9 mm Steyr loaded with the .358 | 158gr | Speer LSWC. Rottweil P 806 delivers the highest muzzle velocity at 984 fps; across all powders the maximum-charge window runs from 686 fps to 984 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 6 of the 18 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (135 MPa), the top charges use 50–90 %, 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. 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.