Load Specifications
Load data in caliber 9 mm Steyr with .356 | 148gr | Rim Rock TC bullet and 16 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 |
|---|---|---|---|---|---|---|
| Accurate Solo 1250² | <<locked>> | 64% | 17,521 psi | 89% | 883 fps | 100% |
| Alliant Herco² | <<locked>> | 76% | 17,100 psi | 87% | 909 fps | 97.3% |
| Alliant UNIQUE² | <<locked>> | 64% | 17,434 psi | 89% | 915 fps | 97.4% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 76% | 16,737 psi | 85% | 860 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,865 psi | 66% | 745 fps | 100% |
| Maxam CSB 1² | <<locked>> | 64% | 16,781 psi | 86% | 863 fps | 99.9% |
| Maxam CSB 2² | <<locked>> | 64% | 17,202 psi | 88% | 896 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,240 psi | 57% | 732 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 17,231 psi | 88% | 932 fps | 99% |
| Rottweil P 806* | <<locked>> | 80% | 17,071 psi | 87% | 1014 fps | 89.5% |
| SNPE Vectan A0² | <<locked>> | 64% | 16,911 psi | 86% | 869 fps | 96.8% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 72% | 17,274 psi | 88% | 902 fps | 89.6% |
| Vihtavuori 3N37*² | <<locked>> | 64% | 15,708 psi | 80% | 896 fps | 89.5% |
| Vihtavuori N32C Tin Star | <<locked>> | 84% | 16,882 psi | 86% | 807 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 72% | 16,897 psi | 86% | 922 fps | 91.2% |
| Winchester AutoComp ² | <<locked>> | 64% | 17,289 psi | 88% | 889 fps | 99.7% |
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% | 15,809 psi | 81% | 850 fps | 99.7% |
| Alliant Herco*² | <<locked>> | 60% | 11,676 psi | 60% | 774 fps | 92% |
| Alliant UNIQUE² | <<locked>> | 60% | 15,882 psi | 81% | 883 fps | 96.4% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,834 psi | 55% | 735 fps | 100% |
| Hodgdon TrailBoss² | 2 gr | 60% | 6,121 psi | 31% | 548 fps | 98.2% |
| Maxam CSB 1² | <<locked>> | 60% | 15,229 psi | 78% | 833 fps | 99.6% |
| Maxam CSB 2² | <<locked>> | 60% | 14,721 psi | 75% | 850 fps | 100% |
| ReloadSwiss RS 14*² | 2 gr | 60% | 5,627 psi | 29% | 535 fps | 93.4% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 13,663 psi | 70% | 850 fps | 96.7% |
| Rottweil P 806*² | <<locked>> | 76% | 14,823 psi | 76% | 961 fps | 86.8% |
| SNPE Vectan A0² | <<locked>> | 60% | 14,736 psi | 75% | 823 fps | 95% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 64% | 14,214 psi | 73% | 833 fps | 86.1% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 13,866 psi | 71% | 850 fps | 87.2% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 9,877 psi | 50% | 669 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 64% | 13,634 psi | 70% | 843 fps | 87.3% |
| Winchester AutoComp ² | <<locked>> | 60% | 15,214 psi | 78% | 846 fps | 99.1% |
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 16 powders for 9 mm Steyr loaded with the .356 | 148gr | Rim Rock TC. Rottweil P 806 delivers the highest muzzle velocity at 1,014 fps; across all powders the maximum-charge window runs from 732 fps to 1,014 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 4 of the 16 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (135 MPa), the top charges use 57–89 %, leaving at least 11 % 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 .356 | 148gr | Rim Rock TC 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 Herco, Alliant UNIQUE 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.