Load Specifications
Load data in caliber 9 mm Steyr with .358 | 130gr | Rim Rock RNFP Cowboy bullet and 12 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are 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 |
|---|---|---|---|---|---|---|
| Alliant Herco² | <<locked>> | 76% | 17,550 psi | 90% | 1014 fps | 97% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 76% | 17,492 psi | 89% | 968 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,749 psi | 65% | 823 fps | 100% |
| Maxam CSB 1² | <<locked>> | 64% | 16,897 psi | 86% | 961 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,661 psi | 60% | 823 fps | 99.9% |
| ReloadSwiss RS 20² | <<locked>> | 64% | 16,012 psi | 82% | 1001 fps | 97.8% |
| Rottweil P 806* | <<locked>> | 80% | 17,709 psi | 90% | 1125 fps | 88.9% |
| SNPE Vectan A0² | <<locked>> | 64% | 17,332 psi | 89% | 974 fps | 96.5% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 16,114 psi | 82% | 971 fps | 87.5% |
| Vihtavuori 3N37*² | <<locked>> | 64% | 15,867 psi | 81% | 991 fps | 88.6% |
| Vihtavuori N32C Tin Star | <<locked>> | 80% | 16,302 psi | 83% | 886 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 72% | 17,593 psi | 90% | 1033 fps | 91% |
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% | 11,748 psi | 60% | 860 fps | 91.1% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 11,168 psi | 57% | 823 fps | 100% |
| Hodgdon TrailBoss² | 2.3 gr | 60% | 6,092 psi | 31% | 604 fps | 97.6% |
| Maxam CSB 1² | <<locked>> | 60% | 15,490 psi | 79% | 928 fps | 99.4% |
| ReloadSwiss RS 14*² | 2.4 gr | 60% | 5,889 psi | 30% | 604 fps | 93.2% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 14,185 psi | 72% | 955 fps | 96.4% |
| Rottweil P 806*² | <<locked>> | 76% | 15,708 psi | 80% | 1076 fps | 86.5% |
| SNPE Vectan A0*² | <<locked>> | 60% | 15,389 psi | 79% | 928 fps | 94.9% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 64% | 14,547 psi | 74% | 928 fps | 85.5% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 14,228 psi | 73% | 948 fps | 86.6% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 9,776 psi | 50% | 741 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 64% | 13,605 psi | 69% | 928 fps | 86.2% |
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 12 powders for 9 mm Steyr loaded with the .358 | 130gr | Rim Rock RNFP Cowboy. Rottweil P 806 delivers the highest muzzle velocity at 1,125 fps; across all powders the maximum-charge window runs from 823 fps to 1,125 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 4 of the 12 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (135 MPa), the top charges use 60–90 %, 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. Hodgdon TrailBoss, ReloadSwiss RS 14 rank at the top here: for 9 mm Steyr with the .358 | 130gr | Rim Rock RNFP Cowboy 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. Alliant Herco, Baschieri & Pellagri 102 Pistol, Hodgdon TrailBoss 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.