Load Specifications
Load data in caliber 9 x 57 Mauser with .358 | 140gr | Hammer Stone Hammer bullet and 10 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N120, 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% | 36,724 psi | 90% | 2828 fps | 99.2% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 36,390 psi | 90% | 2851 fps | 96.6% |
| Alliant Reloder-10x | <<locked>> | 94% | 36,564 psi | 90% | 2840 fps | 96% |
| Alliant Reloder-7 | <<locked>> | 86% | 36,564 psi | 90% | 2768 fps | 96.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,429 psi | 75% | 1847 fps | 100% |
| IMR 4198 | <<locked>> | 90% | 35,462 psi | 87% | 2748 fps | 96.4% |
| Norma 200 | <<locked>> | 90% | 36,463 psi | 90% | 2824 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,646 psi | 73% | 1892 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 35,099 psi | 86% | 2564 fps | 100% |
| Vihtavuori N120 | <<locked>> | 90% | 36,608 psi | 90% | 2785 fps | 99.8% |
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% | 28,558 psi | 70% | 2618 fps | 97.2% |
| Alliant AR-Comp | <<locked>> | 98% | 33,402 psi | 82% | 2794 fps | 95.8% |
| Alliant Reloder-10x | <<locked>> | 92% | 34,330 psi | 85% | 2785 fps | 95.2% |
| Alliant Reloder-7 | <<locked>> | 82% | 32,372 psi | 80% | 2663 fps | 95% |
| Hodgdon TrailBoss | 14.1 gr | 80% | 21,915 psi | 54% | 1652 fps | 100% |
| IMR 4198 | <<locked>> | 88% | 33,591 psi | 83% | 2700 fps | 95.7% |
| Norma 200 | <<locked>> | 86% | 32,227 psi | 79% | 2718 fps | 95.4% |
| ReloadSwiss RS 14 | 14.4 gr | 80% | 21,640 psi | 53% | 1692 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 33,083 psi | 81% | 2522 fps | 100% |
| Vihtavuori N120 | 38.2 gr | 80% | 26,992 psi | 66% | 2537 fps | 97.7% |
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 19 powders for 9 x 57 Mauser loaded with the .358 | 140gr | Hammer Stone Hammer. Alliant AR-Comp delivers the highest muzzle velocity at 2,851 fps; across all powders the maximum-charge window runs from 1,847 fps to 2,851 fps. Accurate 2015 gives the best case fill at 100 %, and 19 of the 19 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 73–90 %, 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. Vihtavuori N120, ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 9 x 57 Mauser with the .358 | 140gr | Hammer Stone Hammer they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 1680, Accurate 2015, Accurate LT-30 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.