Load Specifications
Load data in caliber 9 x 57 Mauser with .355 | 123gr | Geco SOFTPOINT bullet and 8 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2207, Vihtavuori N120 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 ≥ 80% and propellant combustion ≥ 95%. 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: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2207 | <<locked>> | 90% | 35,288 psi | 87% | 3005 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,587 psi | 70% | 1991 fps | 100% |
| IMR 4227 | <<locked>> | 82% | 35,201 psi | 87% | 2894 fps | 97% |
| Lovex S053 | <<locked>> | 84% | 36,201 psi | 89% | 2927 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 27,702 psi | 68% | 2031 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 84% | 36,434 psi | 90% | 2969 fps | 97.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 35,781 psi | 88% | 2792 fps | 100% |
| Vihtavuori N120 | <<locked>> | 90% | 35,636 psi | 88% | 2976 fps | 99.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2207 | 42.9 gr | 82% | 26,992 psi | 66% | 2766 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,523 psi | 51% | 1778 fps | 100% |
| IMR 4227 | <<locked>> | 80% | 33,083 psi | 81% | 2838 fps | 96.3% |
| Lovex S053 | <<locked>> | 80% | 31,952 psi | 79% | 2818 fps | 98.9% |
| ReloadSwiss RS 14 | 15.4 gr | 80% | 19,957 psi | 49% | 1818 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 31,807 psi | 78% | 2844 fps | 95.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 30,153 psi | 74% | 2664 fps | 100% |
| Vihtavuori N120 | 41.9 gr | 80% | 25,730 psi | 63% | 2690 fps | 96.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 17 powders for 9 x 57 Mauser loaded with the .355 | 123gr | Geco SOFTPOINT. ADI AR 2207 delivers the highest muzzle velocity at 3,005 fps; across all powders the maximum-charge window runs from 1,991 fps to 3,005 fps. Accurate 2015 gives the best case fill at 100 %, and 17 of the 17 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 68–90 %, leaving at least 10 % headroom. Accurate 2015, Alliant AR-Comp, Hodgdon TrailBoss 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. ADI AR 2207, Vihtavuori N120, ReloadSwiss RS 14 rank at the top here: for 9 x 57 Mauser with the .355 | 123gr | Geco SOFTPOINT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 1680, Accurate 2015, Alliant AR-Comp burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.