Load Specifications
Load data in caliber 9 mm Steyr with .355 | 124gr | CamPro RN bullet and 14 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% | 17,593 psi | 90% | 1010 fps | 99.7% |
| Alliant Herco² | <<locked>> | 76% | 17,376 psi | 89% | 1040 fps | 96.3% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 76% | 16,752 psi | 86% | 981 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,778 psi | 65% | 850 fps | 100% |
| Maxam CSB 1² | <<locked>> | 64% | 16,853 psi | 86% | 988 fps | 99.6% |
| Maxam CSB 2² | <<locked>> | 64% | 17,143 psi | 88% | 1024 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,618 psi | 59% | 846 fps | 99.8% |
| ReloadSwiss RS 20² | <<locked>> | 64% | 15,273 psi | 78% | 1010 fps | 96.7% |
| SNPE Vectan A0² | <<locked>> | 64% | 16,621 psi | 85% | 984 fps | 95.4% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 72% | 17,593 psi | 90% | 1033 fps | 88.2% |
| Vihtavuori 3N37*² | <<locked>> | 68% | 17,361 psi | 89% | 1056 fps | 89.5% |
| Vihtavuori N32C Tin Star | <<locked>> | 84% | 16,969 psi | 87% | 928 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 72% | 17,347 psi | 89% | 1053 fps | 89.9% |
| Winchester AutoComp ² | <<locked>> | 64% | 17,202 psi | 88% | 1010 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% | 15,461 psi | 79% | 961 fps | 99.1% |
| Alliant Herco*² | <<locked>> | 60% | 11,313 psi | 58% | 866 fps | 89.6% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 11,168 psi | 57% | 846 fps | 99.9% |
| Hodgdon TrailBoss² | 2.3 gr | 60% | 5,889 psi | 30% | 614 fps | 96.7% |
| Maxam CSB 1² | <<locked>> | 60% | 14,910 psi | 76% | 942 fps | 98.9% |
| Maxam CSB 2² | <<locked>> | 60% | 15,055 psi | 77% | 974 fps | 100% |
| ReloadSwiss RS 14*² | 2.4 gr | 60% | 5,685 psi | 29% | 610 fps | 91.9% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 13,547 psi | 69% | 961 fps | 95.1% |
| SNPE Vectan A0*² | <<locked>> | 60% | 14,794 psi | 76% | 938 fps | 93.7% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 15,432 psi | 79% | 978 fps | 85.7% |
| Vihtavuori 3N37*² | <<locked>> | 64% | 15,679 psi | 80% | 1014 fps | 87.6% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 9,834 psi | 50% | 768 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 68% | 15,040 psi | 77% | 994 fps | 87.2% |
| Winchester AutoComp ² | <<locked>> | 60% | 15,432 psi | 79% | 968 fps | 98.4% |
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 14 powders for 9 mm Steyr loaded with the .355 | 124gr | CamPro RN. Vihtavuori 3N37 delivers the highest muzzle velocity at 1,056 fps; across all powders the maximum-charge window runs from 846 fps to 1,056 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 3 of the 14 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (135 MPa), the top charges use 59–90 %, 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 .355 | 124gr | CamPro RN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, SNPE Vectan BA7 1/2, Vihtavuori 3N37, Vihtavuori N350 burn incompletely and react more sensitively to barrel length and temperature. Accurate Solo 1250, Alliant Herco, Baschieri & Pellagri 102 Pistol 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.