Load Specifications
Load data in caliber 9 x 57 Mauser with .357 | 158gr | Geco HOLLOW POINT bullet and 13 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, Alliant Reloder-10x and Vihtavuori N130.
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 |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 94% | 35,186 psi | 87% | 2677 fps | 96.4% |
| ADI AR 2207 | <<locked>> | 84% | 36,492 psi | 90% | 2697 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 96% | 35,085 psi | 86% | 2753 fps | 98.7% |
| Alliant Reloder-10x | <<locked>> | 90% | 36,260 psi | 89% | 2720 fps | 97.8% |
| Alliant Reloder-7 | <<locked>> | 82% | 35,578 psi | 88% | 2641 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,545 psi | 75% | 1781 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 34,882 psi | 86% | 2631 fps | 98.2% |
| Norma 200 | <<locked>> | 86% | 35,824 psi | 88% | 2697 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,907 psi | 74% | 1818 fps | 100% |
| Vihtavuori N120 | <<locked>> | 82% | 34,345 psi | 85% | 2615 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 35,186 psi | 87% | 2631 fps | 97.2% |
| Vihtavuori N133 | <<locked>> | 94% | 34,708 psi | 85% | 2621 fps | 95.9% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 33,692 psi | 83% | 2690 fps | 96% |
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 |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 92% | 33,040 psi | 81% | 2625 fps | 95.6% |
| ADI AR 2207 | <<locked>> | 80% | 31,937 psi | 79% | 2595 fps | 99.4% |
| Alliant AR-Comp | 47.7 gr | 88% | 27,050 psi | 67% | 2526 fps | 95.5% |
| Alliant Reloder-10x | 44.4 gr | 84% | 29,878 psi | 74% | 2559 fps | 95.7% |
| Alliant Reloder-7 | <<locked>> | 80% | 33,272 psi | 82% | 2585 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,104 psi | 54% | 1588 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 29,066 psi | 72% | 2480 fps | 96.2% |
| Norma 200 | <<locked>> | 80% | 29,167 psi | 72% | 2533 fps | 96.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 21,727 psi | 54% | 1624 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 32,227 psi | 79% | 2566 fps | 99.9% |
| Vihtavuori N130 | 44.5 gr | 84% | 29,109 psi | 72% | 2477 fps | 95% |
| Vihtavuori N133 | <<locked>> | 92% | 32,503 psi | 80% | 2569 fps | 95% |
| Vihtavuori N135 | <<locked>> | 98% | 31,705 psi | 78% | 2638 fps | 95.1% |
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 35 powders for 9 x 57 Mauser loaded with the .357 | 158gr | Geco HOLLOW POINT. IMR 3031 delivers the highest muzzle velocity at 2,762 fps; across all powders the maximum-charge window runs from 1,781 fps to 2,762 fps. Accurate 2495 gives the best case fill at 100 %, and 35 of the 35 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 74–90 %, leaving at least 10 % headroom. Accurate 2495, Hodgdon TrailBoss, Lovex D073.6 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. Alliant AR-Comp, Alliant Reloder-10x, Vihtavuori N130 rank at the top here: for 9 x 57 Mauser with the .357 | 158gr | Geco HOLLOW POINT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2460, Accurate 2520, 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.