Load Specifications
Load data in caliber 9 mm Steyr with .356 | 125gr | SNS Coated Bullets RN bullet and 9 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 14 and Hodgdon TrailBoss.
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>> | 72% | 17,042 psi | 87% | 994 fps | 95.7% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 72% | 16,592 psi | 85% | 948 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 14,373 psi | 73% | 850 fps | 100% |
| Maxam CSB 1² | <<locked>> | 64% | 17,579 psi | 90% | 971 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 13,532 psi | 69% | 856 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 64% | 16,795 psi | 86% | 1017 fps | 97.6% |
| Vihtavuori 3N37*² | <<locked>> | 64% | 16,969 psi | 87% | 1014 fps | 88.6% |
| Vihtavuori N32C Tin Star | <<locked>> | 80% | 17,361 psi | 89% | 899 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 68% | 16,201 psi | 83% | 994 fps | 88.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Alliant Herco*² | <<locked>> | 60% | 12,952 psi | 66% | 879 fps | 91.6% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 12,183 psi | 62% | 840 fps | 100% |
| Hodgdon TrailBoss² | 2.2 gr | 60% | 7,556 psi | 39% | 633 fps | 99.1% |
| Maxam CSB 1² | <<locked>> | 60% | 16,186 psi | 83% | 938 fps | 99.2% |
| ReloadSwiss RS 14² | 2.3 gr | 60% | 7,513 psi | 38% | 640 fps | 96.1% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 14,968 psi | 76% | 968 fps | 96.2% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 14,823 psi | 76% | 955 fps | 86% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 11,414 psi | 58% | 768 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 64% | 14,562 psi | 74% | 948 fps | 86.1% |
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 2 powders for 9 mm Steyr loaded with the .356 | 125gr | SNS Coated Bullets RN. ReloadSwiss RS 14 delivers the highest muzzle velocity at 856 fps; across all powders the maximum-charge window runs from 850 fps to 856 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 2 of the 2 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (135 MPa), the top charges use 69–73 %, leaving at least 27 % 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. ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 9 mm Steyr with the .356 | 125gr | SNS Coated Bullets RN they combine a high case fill with complete burn and sit in the upper velocity band. Hodgdon TrailBoss, ReloadSwiss RS 14 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.