Load Specifications
Load data in caliber 9 x 57 Mauser with .358 | 158gr | Rim Rock FP?TC bullet and 12 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma 200, Alliant AR-Comp and Alliant Reloder-10x.
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 1680 | <<locked>> | 82% | 35,737 psi | 88% | 2552 fps | 96.7% |
| ADI AR 2207 | <<locked>> | 86% | 34,751 psi | 86% | 2621 fps | 99.5% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 35,578 psi | 88% | 2713 fps | 98.1% |
| Alliant Reloder-10x | <<locked>> | 92% | 34,563 psi | 85% | 2638 fps | 96.7% |
| Alliant Reloder-7 | <<locked>> | 84% | 34,403 psi | 85% | 2569 fps | 97% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 29,617 psi | 73% | 1722 fps | 100% |
| IMR 4198 | <<locked>> | 90% | 35,795 psi | 88% | 2605 fps | 97.7% |
| Norma 200 | <<locked>> | 90% | 36,347 psi | 90% | 2671 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,935 psi | 71% | 1759 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 35,201 psi | 87% | 2408 fps | 100% |
| Vihtavuori N120 | <<locked>> | 86% | 35,056 psi | 86% | 2592 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 94% | 36,100 psi | 89% | 2605 fps | 96.7% |
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 1680 | <<locked>> | 80% | 33,257 psi | 82% | 2493 fps | 95.9% |
| ADI AR 2207 | <<locked>> | 80% | 28,558 psi | 70% | 2470 fps | 98.2% |
| Alliant AR-Comp | 46.2 gr | 94% | 29,399 psi | 72% | 2546 fps | 95.7% |
| Alliant Reloder-10x | 42.2 gr | 88% | 30,342 psi | 75% | 2536 fps | 95.1% |
| Alliant Reloder-7 | <<locked>> | 80% | 30,066 psi | 74% | 2461 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,451 psi | 53% | 1539 fps | 100% |
| IMR 4198 | <<locked>> | 84% | 30,008 psi | 74% | 2461 fps | 95.7% |
| Norma 200 | 40.8 gr | 82% | 27,833 psi | 69% | 2457 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 21,060 psi | 52% | 1575 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 33,301 psi | 82% | 2369 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 28,863 psi | 71% | 2448 fps | 99.2% |
| Vihtavuori N130 | <<locked>> | 90% | 31,589 psi | 78% | 2503 fps | 95.2% |
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 12 powders for 9 x 57 Mauser loaded with the .358 | 158gr | Rim Rock FP?TC. Alliant AR-Comp delivers the highest muzzle velocity at 2,713 fps; across all powders the maximum-charge window runs from 1,722 fps to 2,713 fps. Alliant AR-Comp gives the best case fill at 100 %, and 12 of the 12 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 71–90 %, 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. Norma 200, Alliant AR-Comp, Alliant Reloder-10x rank at the top here: for 9 x 57 Mauser with the .358 | 158gr | Rim Rock FP?TC they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.