Load Specifications
Load data in caliber 9 mm Steyr with .356 | 147gr | Rim Rock FP 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% | 17,100 psi | 87% | 866 fps | 99.8% |
| Alliant BE-86² | <<locked>> | 64% | 17,129 psi | 87% | 869 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 17,695 psi | 90% | 912 fps | 97.1% |
| Alliant UNIQUE² | <<locked>> | 64% | 16,302 psi | 83% | 883 fps | 96.1% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 17,347 psi | 89% | 863 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 11,690 psi | 60% | 715 fps | 100% |
| Maxam CSB 1² | <<locked>> | 68% | 17,260 psi | 88% | 863 fps | 99.9% |
| Maxam CSB 2² | <<locked>> | 68% | 17,550 psi | 90% | 896 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 10,747 psi | 55% | 715 fps | 99.7% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 16,273 psi | 83% | 902 fps | 98.1% |
| Rottweil P 806* | <<locked>> | 84% | 17,521 psi | 89% | 1017 fps | 89.2% |
| SNPE Vectan A0² | <<locked>> | 68% | 17,492 psi | 89% | 873 fps | 96.6% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 72% | 16,723 psi | 85% | 879 fps | 88.1% |
| Vihtavuori 3N37*² | <<locked>> | 68% | 16,375 psi | 84% | 899 fps | 89.4% |
| Vihtavuori N32C Tin Star | <<locked>> | 88% | 17,260 psi | 88% | 807 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 16,795 psi | 86% | 876 fps | 96.7% |
| Vihtavuori N350*² | <<locked>> | 76% | 17,695 psi | 90% | 925 fps | 91.1% |
| Winchester AutoComp ² | <<locked>> | 64% | 16,418 psi | 84% | 863 fps | 99.2% |
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% | 14,489 psi | 74% | 814 fps | 99% |
| Alliant BE-86² | <<locked>> | 60% | 14,794 psi | 76% | 823 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 10,834 psi | 55% | 741 fps | 89.8% |
| Alliant UNIQUE*² | <<locked>> | 60% | 14,750 psi | 75% | 846 fps | 94.7% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,428 psi | 53% | 719 fps | 99.8% |
| Hodgdon TrailBoss² | 1.8 gr | 60% | 5,598 psi | 29% | 522 fps | 96.8% |
| Maxam CSB 1² | <<locked>> | 60% | 13,982 psi | 71% | 797 fps | 98.7% |
| Maxam CSB 2² | <<locked>> | 60% | 14,098 psi | 72% | 830 fps | 100% |
| ReloadSwiss RS 14*² | 1.9 gr | 60% | 5,482 psi | 28% | 522 fps | 92.2% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 12,691 psi | 65% | 817 fps | 95% |
| Rottweil P 806* | <<locked>> | 80% | 15,113 psi | 77% | 961 fps | 86.3% |
| SNPE Vectan A0*² | <<locked>> | 60% | 14,431 psi | 74% | 807 fps | 94% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 14,765 psi | 75% | 837 fps | 85.8% |
| Vihtavuori 3N37*² | <<locked>> | 64% | 14,330 psi | 73% | 853 fps | 86.9% |
| Vihtavuori N32C Tin Star² | 2.5 gr | 60% | 9,224 psi | 47% | 650 fps | 100% |
| Vihtavuori N340*² | <<locked>> | 60% | 14,417 psi | 74% | 827 fps | 94.8% |
| Vihtavuori N350*² | <<locked>> | 68% | 14,156 psi | 72% | 846 fps | 87.1% |
| Winchester AutoComp ² | <<locked>> | 60% | 14,301 psi | 73% | 817 fps | 98.2% |
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 18 powders for 9 mm Steyr loaded with the .356 | 147gr | Rim Rock FP. Rottweil P 806 delivers the highest muzzle velocity at 1,017 fps; across all powders the maximum-charge window runs from 715 fps to 1,017 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 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 .356 | 147gr | Rim Rock FP 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.