Load Specifications
Load data in caliber 9 x 57 Mauser with .358 | 148gr | Rim Rock SWC bullet and 11 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, IMR 4198 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>> | 86% | 36,695 psi | 90% | 2789 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 98% | 35,143 psi | 87% | 2828 fps | 98% |
| Alliant Reloder-10x | <<locked>> | 92% | 36,506 psi | 90% | 2808 fps | 97.2% |
| Alliant Reloder-7 | <<locked>> | 84% | 36,042 psi | 89% | 2730 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,052 psi | 74% | 1834 fps | 100% |
| IMR 4198 | <<locked>> | 88% | 35,259 psi | 87% | 2720 fps | 97.6% |
| Norma 200 | <<locked>> | 88% | 36,042 psi | 89% | 2785 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,356 psi | 72% | 1870 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 36,550 psi | 90% | 2552 fps | 100% |
| Vihtavuori N120 | <<locked>> | 84% | 34,505 psi | 85% | 2703 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 92% | 35,520 psi | 87% | 2717 fps | 96.6% |
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% | 29,878 psi | 74% | 2625 fps | 98.5% |
| Alliant AR-Comp | 49.8 gr | 92% | 28,993 psi | 71% | 2654 fps | 95.5% |
| Alliant Reloder-10x | <<locked>> | 88% | 32,024 psi | 79% | 2697 fps | 95.7% |
| Alliant Reloder-7 | <<locked>> | 80% | 31,517 psi | 78% | 2618 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,712 psi | 53% | 1637 fps | 100% |
| IMR 4198 | 41.1 gr | 82% | 29,240 psi | 72% | 2556 fps | 95.3% |
| Norma 200 | <<locked>> | 82% | 29,327 psi | 72% | 2615 fps | 95.6% |
| ReloadSwiss RS 14 | 15.4 gr | 80% | 21,292 psi | 52% | 1673 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 34,345 psi | 85% | 2510 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 30,182 psi | 74% | 2598 fps | 99.4% |
| Vihtavuori N130 | <<locked>> | 88% | 31,256 psi | 77% | 2612 fps | 95% |
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 31 powders for 9 x 57 Mauser loaded with the .358 | 148gr | Rim Rock SWC. Alliant AR-Comp delivers the highest muzzle velocity at 2,828 fps; across all powders the maximum-charge window runs from 1,834 fps to 2,828 fps. Accurate 2495 gives the best case fill at 100 %, and 31 of the 31 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 69–90 %, 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, IMR 4198, ReloadSwiss RS 14 rank at the top here: for 9 x 57 Mauser with the .358 | 148gr | Rim Rock SWC 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.