Load Specifications
Load data in caliber 9 x 57 Mauser with .356 | 125gr | SNS Coated Bullets RN bullet and 7 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 ≥ 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>> | 88% | 36,042 psi | 89% | 2982 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 29,733 psi | 73% | 1985 fps | 100% |
| Lovex S053 | <<locked>> | 82% | 36,666 psi | 90% | 2894 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,124 psi | 72% | 2024 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 82% | 36,709 psi | 90% | 2936 fps | 97.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 36,260 psi | 89% | 2762 fps | 100% |
| Vihtavuori N120 | <<locked>> | 88% | 36,289 psi | 89% | 2949 fps | 99.4% |
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 | <<locked>> | 80% | 27,963 psi | 69% | 2753 fps | 95.9% |
| Hodgdon TrailBoss | 15.1 gr | 80% | 21,669 psi | 53% | 1775 fps | 100% |
| Lovex S053 | <<locked>> | 80% | 34,563 psi | 85% | 2844 fps | 99.4% |
| ReloadSwiss RS 14 | 15.4 gr | 80% | 21,350 psi | 53% | 1814 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 34,403 psi | 85% | 2877 fps | 96.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 32,547 psi | 80% | 2680 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 28,253 psi | 70% | 2733 fps | 97.4% |
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 18 powders for 9 x 57 Mauser loaded with the .356 | 125gr | SNS Coated Bullets RN. Alliant AR-Comp delivers the highest muzzle velocity at 2,986 fps; across all powders the maximum-charge window runs from 1,985 fps to 2,986 fps. Alliant AR-Comp gives the best case fill at 100 %, and 18 of the 18 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 72–90 %, leaving at least 10 % headroom. Alliant AR-Comp, 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 x 57 Mauser with the .356 | 125gr | SNS Coated Bullets RN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 1680, Accurate 2015, Alliant Reloder-10x 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.