Load Specifications
Load data in caliber 9 mm Steyr with .358 | 158gr | Rim Rock SWC Top Shelf bullet and 18 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% | 17,274 psi | 88% | 823 fps | 99.9% |
| Alliant BE-86² | <<locked>> | 64% | 17,535 psi | 90% | 830 fps | 100% |
| Alliant Herco² | <<locked>> | 76% | 16,795 psi | 86% | 850 fps | 97% |
| Alliant UNIQUE² | <<locked>> | 64% | 16,534 psi | 84% | 843 fps | 96.8% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 76% | 16,114 psi | 82% | 797 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,314 psi | 63% | 689 fps | 100% |
| Maxam CSB 1² | <<locked>> | 68% | 17,463 psi | 89% | 820 fps | 100% |
| Maxam CSB 2² | <<locked>> | 64% | 15,940 psi | 81% | 820 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 10,733 psi | 55% | 676 fps | 99.9% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 16,737 psi | 85% | 866 fps | 98.8% |
| Rottweil P 806* | <<locked>> | 84% | 17,260 psi | 88% | 965 fps | 89.9% |
| SNPE Vectan A0² | <<locked>> | 64% | 16,128 psi | 82% | 801 fps | 96.1% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 72% | 16,679 psi | 85% | 833 fps | 88.8% |
| Vihtavuori 3N37*² | <<locked>> | 68% | 16,331 psi | 83% | 856 fps | 90.1% |
| Vihtavuori N32C Tin Star | <<locked>> | 88% | 17,463 psi | 89% | 764 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 17,158 psi | 88% | 840 fps | 97.4% |
| Vihtavuori N350*² | <<locked>> | 72% | 16,143 psi | 82% | 850 fps | 90.3% |
| Winchester AutoComp ² | <<locked>> | 64% | 16,041 psi | 82% | 810 fps | 99.4% |
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% | 14,475 psi | 74% | 771 fps | 99.3% |
| Alliant BE-86² | <<locked>> | 60% | 15,040 psi | 77% | 784 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 10,907 psi | 56% | 709 fps | 90.8% |
| Alliant UNIQUE² | <<locked>> | 60% | 14,881 psi | 76% | 807 fps | 95.5% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,414 psi | 53% | 682 fps | 100% |
| Hodgdon TrailBoss² | 1.7 gr | 60% | 5,642 psi | 29% | 495 fps | 97.3% |
| Maxam CSB 1² | <<locked>> | 60% | 13,953 psi | 71% | 755 fps | 99.1% |
| Maxam CSB 2² | <<locked>> | 60% | 14,170 psi | 72% | 787 fps | 100% |
| ReloadSwiss RS 14*² | 1.8 gr | 60% | 5,569 psi | 28% | 499 fps | 93.2% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 12,865 psi | 66% | 778 fps | 95.8% |
| Rottweil P 806*² | <<locked>> | 76% | 13,706 psi | 70% | 883 fps | 85.3% |
| SNPE Vectan A0*² | <<locked>> | 60% | 14,576 psi | 74% | 768 fps | 94.7% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 14,634 psi | 75% | 791 fps | 86.4% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 12,908 psi | 66% | 778 fps | 85.8% |
| Vihtavuori N32C Tin Star² | 2.3 gr | 60% | 8,963 psi | 46% | 607 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 14,605 psi | 75% | 787 fps | 95.6% |
| Vihtavuori N350*² | <<locked>> | 64% | 12,691 psi | 65% | 768 fps | 85.8% |
| Winchester AutoComp ² | <<locked>> | 60% | 14,562 psi | 74% | 781 fps | 98.7% |
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 18 powders for 9 mm Steyr loaded with the .358 | 158gr | Rim Rock SWC Top Shelf. Rottweil P 806 delivers the highest muzzle velocity at 965 fps; across all powders the maximum-charge window runs from 676 fps to 965 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 4 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 55–90 %, 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 | Rim Rock SWC Top Shelf 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.