Load Specifications
Load data in caliber 9 mm Steyr with .356 | 115gr | H&N HP HS bullet and 32 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% | 17,361 psi | 89% | 1053 fps | 99.4% |
| Accurate Solo 1250² | <<locked>> | 64% | 16,926 psi | 86% | 1040 fps | 99.2% |
| Alliant BE-86² | <<locked>> | 64% | 17,695 psi | 90% | 1063 fps | 100% |
| Alliant BE-86² | <<locked>> | 64% | 17,303 psi | 88% | 1050 fps | 100% |
| Alliant Herco² | <<locked>> | 76% | 16,868 psi | 86% | 1076 fps | 95.1% |
| Alliant Herco*² | <<locked>> | 76% | 16,563 psi | 85% | 1066 fps | 94.8% |
| Alliant UNIQUE² | <<locked>> | 64% | 16,839 psi | 86% | 1076 fps | 95% |
| Alliant UNIQUE² | <<locked>> | 64% | 17,056 psi | 87% | 1079 fps | 95% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 76% | 16,331 psi | 83% | 1024 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 76% | 16,549 psi | 85% | 1027 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,183 psi | 62% | 879 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,343 psi | 63% | 883 fps | 100% |
| Maxam CSB 1² | <<locked>> | 64% | 16,012 psi | 82% | 1017 fps | 98.9% |
| Maxam CSB 1² | <<locked>> | 64% | 16,230 psi | 83% | 1020 fps | 99% |
| Maxam CSB 2² | <<locked>> | 64% | 16,810 psi | 86% | 1070 fps | 100% |
| Maxam CSB 2² | <<locked>> | 64% | 16,346 psi | 83% | 1056 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,081 psi | 57% | 873 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,226 psi | 57% | 876 fps | 99.3% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 17,260 psi | 88% | 1112 fps | 97.5% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 16,940 psi | 87% | 1099 fps | 97.2% |
| SNPE Vectan A0*² | <<locked>> | 64% | 16,375 psi | 84% | 1027 fps | 94.3% |
| SNPE Vectan A0*² | <<locked>> | 64% | 16,607 psi | 85% | 1030 fps | 94.4% |
| Vihtavuori 3N37*² | <<locked>> | 68% | 17,260 psi | 88% | 1102 fps | 88.2% |
| Vihtavuori 3N37*² | <<locked>> | 68% | 16,984 psi | 87% | 1093 fps | 87.8% |
| Vihtavuori N32C Tin Star | <<locked>> | 84% | 16,679 psi | 85% | 971 fps | 100% |
| Vihtavuori N32C Tin Star | <<locked>> | 88% | 17,637 psi | 90% | 988 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 17,579 psi | 90% | 1079 fps | 95.9% |
| Vihtavuori N340² | <<locked>> | 64% | 17,187 psi | 88% | 1066 fps | 95.5% |
| Vihtavuori N350*² | <<locked>> | 72% | 16,694 psi | 85% | 1086 fps | 88% |
| Vihtavuori N350*² | <<locked>> | 72% | 16,389 psi | 84% | 1076 fps | 87.5% |
| Winchester AutoComp ² | <<locked>> | 64% | 16,766 psi | 86% | 1050 fps | 98.6% |
| Winchester AutoComp ² | <<locked>> | 64% | 16,418 psi | 84% | 1040 fps | 98.3% |
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% | 15,360 psi | 78% | 1004 fps | 98.6% |
| Accurate Solo 1250² | <<locked>> | 60% | 14,895 psi | 76% | 991 fps | 98.2% |
| Alliant BE-86² | <<locked>> | 60% | 15,853 psi | 81% | 1020 fps | 99.8% |
| Alliant BE-86² | <<locked>> | 60% | 15,476 psi | 79% | 1010 fps | 99.7% |
| Alliant Herco*² | <<locked>> | 60% | 11,153 psi | 57% | 902 fps | 88.1% |
| Alliant Herco*² | <<locked>> | 60% | 10,878 psi | 56% | 889 fps | 87.5% |
| Alliant UNIQUE*² | <<locked>> | 60% | 15,026 psi | 77% | 1027 fps | 93.2% |
| Alliant UNIQUE*² | <<locked>> | 60% | 15,214 psi | 78% | 1030 fps | 93.3% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,602 psi | 54% | 873 fps | 99.3% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,718 psi | 55% | 873 fps | 99.4% |
| Hodgdon TrailBoss² | 2.4 gr | 60% | 5,773 psi | 29% | 640 fps | 95.6% |
| Hodgdon TrailBoss² | 2.4 gr | 60% | 5,831 psi | 30% | 640 fps | 95.7% |
| Maxam CSB 1² | <<locked>> | 60% | 14,750 psi | 75% | 984 fps | 98.3% |
| Maxam CSB 1² | <<locked>> | 60% | 14,373 psi | 73% | 971 fps | 97.9% |
| Maxam CSB 2² | <<locked>> | 60% | 14,852 psi | 76% | 1020 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 14,359 psi | 73% | 1007 fps | 100% |
| ReloadSwiss RS 14*² | 2.4 gr | 60% | 5,584 psi | 29% | 636 fps | 90.5% |
| ReloadSwiss RS 14*² | 2.4 gr | 60% | 5,352 psi | 27% | 620 fps | 89.6% |
| ReloadSwiss RS 20*² | <<locked>> | 60% | 13,300 psi | 68% | 997 fps | 93.8% |
| ReloadSwiss RS 20*² | <<locked>> | 60% | 13,445 psi | 69% | 1001 fps | 93.8% |
| SNPE Vectan A0*² | <<locked>> | 60% | 14,620 psi | 75% | 981 fps | 92.6% |
| SNPE Vectan A0*² | <<locked>> | 60% | 14,286 psi | 73% | 968 fps | 92% |
| Vihtavuori 3N37*² | <<locked>> | 64% | 15,098 psi | 77% | 1043 fps | 85.6% |
| Vihtavuori 3N37*² | <<locked>> | 64% | 14,823 psi | 76% | 1033 fps | 85.1% |
| Vihtavuori N32C Tin Star² | 3.2 gr | 60% | 9,456 psi | 48% | 797 fps | 100% |
| Vihtavuori N32C Tin Star² | 3.2 gr | 60% | 9,123 psi | 47% | 784 fps | 100% |
| Vihtavuori N340*² | <<locked>> | 60% | 15,084 psi | 77% | 1014 fps | 93.7% |
| Vihtavuori N340*² | <<locked>> | 60% | 15,331 psi | 78% | 1017 fps | 93.9% |
| Vihtavuori N350*² | <<locked>> | 68% | 14,533 psi | 74% | 1027 fps | 85.3% |
| Vihtavuori N350*² | <<locked>> | 68% | 14,779 psi | 75% | 1030 fps | 85.5% |
| Winchester AutoComp ² | <<locked>> | 60% | 15,127 psi | 77% | 1007 fps | 97.6% |
| Winchester AutoComp ² | <<locked>> | 60% | 14,765 psi | 75% | 997 fps | 97.3% |
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 32 powders for 9 mm Steyr loaded with the .356 | 115gr | H&N HP HS. ReloadSwiss RS 20 delivers the highest muzzle velocity at 1,112 fps; across all powders the maximum-charge window runs from 873 fps to 1,112 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 6 of the 32 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (135 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. Hodgdon TrailBoss, 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 | 115gr | H&N HP HS they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Herco, SNPE Vectan A0, SNPE Vectan A0 burn incompletely and react more sensitively to barrel length and temperature. Accurate Solo 1250, Accurate Solo 1250, Alliant BE-86 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.