Load Specifications
Load data in caliber 9 x 57 Mauser with .355 | 147gr | Winchester FMJ HB bullet and 10 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, 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>> | 84% | 36,550 psi | 90% | 2776 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 96% | 35,099 psi | 86% | 2818 fps | 97.8% |
| Alliant Reloder-10x | <<locked>> | 90% | 36,608 psi | 90% | 2799 fps | 97.1% |
| Alliant Reloder-7 | <<locked>> | 82% | 35,911 psi | 88% | 2717 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,893 psi | 76% | 1844 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 34,882 psi | 86% | 2703 fps | 97.4% |
| Norma 200 | <<locked>> | 86% | 36,448 psi | 90% | 2782 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,443 psi | 75% | 1883 fps | 100% |
| Vihtavuori N120 | <<locked>> | 82% | 34,432 psi | 85% | 2690 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 90% | 35,462 psi | 87% | 2703 fps | 96.4% |
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% | 32,184 psi | 79% | 2674 fps | 99% |
| Alliant AR-Comp | 48.8 gr | 90% | 29,269 psi | 72% | 2651 fps | 95.4% |
| Alliant Reloder-10x | <<locked>> | 86% | 32,155 psi | 79% | 2687 fps | 95.6% |
| Alliant Reloder-7 | <<locked>> | 80% | 33,736 psi | 83% | 2661 fps | 96.6% |
| Hodgdon TrailBoss | 15.1 gr | 80% | 22,626 psi | 56% | 1647 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 29,327 psi | 72% | 2549 fps | 95.2% |
| Norma 200 | <<locked>> | 80% | 30,110 psi | 74% | 2618 fps | 95.6% |
| ReloadSwiss RS 14 | 15.4 gr | 80% | 22,379 psi | 55% | 1686 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 32,416 psi | 80% | 2644 fps | 99.7% |
| Vihtavuori N130 | <<locked>> | 88% | 33,286 psi | 82% | 2651 fps | 95.6% |
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 29 powders for 9 x 57 Mauser loaded with the .355 | 147gr | Winchester FMJ HB. Alliant AR-Comp delivers the highest muzzle velocity at 2,818 fps; across all powders the maximum-charge window runs from 1,844 fps to 2,818 fps. Accurate 2495 gives the best case fill at 100 %, and 29 of the 29 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 75–90 %, leaving at least 10 % headroom. Accurate 2495, Hodgdon TrailBoss, IMR 3031 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, ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 9 x 57 Mauser with the .355 | 147gr | Winchester FMJ HB they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2460, Accurate 2495, 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.