Load Specifications
Load data in caliber .357 Auto Mag. with .358 | 80gr | Rim Rock DEWC bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Herco, Baschieri & Pellagri 102 Pistol and Vihtavuori N32C Tin Star.
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 ≥ 60% and propellant combustion ≥ 80%. 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: 6.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 68% | 32,053 psi | 87% | 1988 fps | 100% |
| Accurate Solo 1000² | <<locked>> | 68% | 31,227 psi | 84% | 1850 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 72% | 30,951 psi | 84% | 1919 fps | 100% |
| ADI AP 100 | <<locked>> | 88% | 31,575 psi | 85% | 2057 fps | 95.4% |
| ADI APS 350² | <<locked>> | 68% | 32,706 psi | 88% | 1736 fps | 100% |
| ADI APS 450² | <<locked>> | 68% | 31,749 psi | 86% | 1759 fps | 100% |
| ADI AS 30² | <<locked>> | 68% | 30,951 psi | 84% | 1801 fps | 100% |
| ADI AS 50N² | <<locked>> | 64% | 30,182 psi | 82% | 1850 fps | 100% |
| Alliant BE-86² | <<locked>> | 72% | 32,518 psi | 88% | 1919 fps | 100% |
| Alliant BULLSEYE² | <<locked>> | 64% | 31,691 psi | 86% | 2021 fps | 100% |
| Alliant Green Dot² | <<locked>> | 68% | 30,734 psi | 83% | 1864 fps | 100% |
| Alliant Herco | <<locked>> | 88% | 33,112 psi | 90% | 2031 fps | 100% |
| Alliant POWER PISTOL*² | <<locked>> | 72% | 31,401 psi | 85% | 2106 fps | 94.3% |
| Alliant RED DOT² | <<locked>> | 72% | 32,634 psi | 88% | 1864 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 72% | 31,343 psi | 85% | 2014 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 68% | 30,632 psi | 83% | 1844 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 88% | 32,735 psi | 89% | 1883 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 64% | 30,690 psi | 83% | 1844 fps | 100% |
| Hodgdon Clays² | <<locked>> | 76% | 31,807 psi | 86% | 1755 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 17,724 psi | 48% | 1486 fps | 100% |
| Hodgdon Universal² | <<locked>> | 68% | 32,909 psi | 89% | 1975 fps | 100% |
| Lovex S020² | <<locked>> | 68% | 33,373 psi | 90% | 2005 fps | 100% |
| Maxam CSB 1² | <<locked>> | 76% | 31,995 psi | 87% | 1929 fps | 100% |
| Maxam CSB 2² | <<locked>> | 72% | 31,647 psi | 86% | 1926 fps | 100% |
| Maxam CSB 3² | <<locked>> | 72% | 32,256 psi | 87% | 1906 fps | 100% |
| Maxam CSB 4² | <<locked>> | 68% | 31,546 psi | 85% | 1867 fps | 100% |
| Maxam CSB 5² | <<locked>> | 64% | 31,227 psi | 84% | 1798 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 64% | 33,170 psi | 90% | 1932 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 16,389 psi | 44% | 1490 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 72% | 29,805 psi | 81% | 1975 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 76% | 32,866 psi | 89% | 2116 fps | 89.7% |
| Rottweil P 806 | <<locked>> | 80% | 33,098 psi | 89% | 2129 fps | 99% |
| SNPE Vectan A0² | <<locked>> | 76% | 32,372 psi | 88% | 1978 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 68% | 32,271 psi | 87% | 1909 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 68% | 31,343 psi | 85% | 1926 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 64% | 32,227 psi | 87% | 1768 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 80% | 31,430 psi | 85% | 2011 fps | 98.9% |
| SNPE Vectan BA9 1/2² | <<locked>> | 68% | 30,879 psi | 83% | 1923 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 68% | 31,531 psi | 85% | 2113 fps | 96% |
| Somchem MP200² | <<locked>> | 68% | 32,460 psi | 88% | 2024 fps | 100% |
| Somchem MS200² | <<locked>> | 72% | 32,648 psi | 88% | 2005 fps | 100% |
| Somchem S221*² | <<locked>> | 64% | 33,185 psi | 90% | 2100 fps | 93.1% |
| Vihtavuori 3N37² | <<locked>> | 72% | 30,414 psi | 82% | 2018 fps | 99.2% |
| Vihtavuori 3N38* | <<locked>> | 88% | 32,416 psi | 88% | 2090 fps | 90.4% |
| Vihtavuori N105* | <<locked>> | 92% | 31,285 psi | 85% | 2133 fps | 93.8% |
| Vihtavuori N320² | <<locked>> | 64% | 30,139 psi | 81% | 1847 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 32,866 psi | 89% | 1781 fps | 100% |
| Vihtavuori N330² | <<locked>> | 68% | 33,199 psi | 90% | 1975 fps | 100% |
| Vihtavuori N340² | <<locked>> | 72% | 32,430 psi | 88% | 1998 fps | 100% |
| Vihtavuori N350 | <<locked>> | 80% | 33,054 psi | 89% | 2073 fps | 99.7% |
| Winchester AutoComp ² | <<locked>> | 72% | 30,429 psi | 82% | 1913 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 6.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 60% | 24,889 psi | 67% | 1824 fps | 99.4% |
| Accurate Solo 1000² | <<locked>> | 60% | 25,643 psi | 69% | 1732 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 21,915 psi | 59% | 1709 fps | 100% |
| ADI AP 100*² | <<locked>> | 68% | 18,449 psi | 50% | 1667 fps | 85.8% |
| ADI APS 350² | <<locked>> | 60% | 27,093 psi | 73% | 1627 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 26,136 psi | 71% | 1647 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 25,295 psi | 68% | 1686 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 27,412 psi | 74% | 1791 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 22,655 psi | 61% | 1706 fps | 100% |
| Alliant BULLSEYE² | <<locked>> | 60% | 28,442 psi | 77% | 1949 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 24,918 psi | 67% | 1736 fps | 100% |
| Alliant Herco² | 10.9 gr | 60% | 16,143 psi | 44% | 1565 fps | 97% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 21,422 psi | 58% | 1811 fps | 87.4% |
| Alliant RED DOT² | <<locked>> | 60% | 24,453 psi | 66% | 1690 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 22,118 psi | 60% | 1781 fps | 99.6% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 24,366 psi | 66% | 1713 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | 10.2 gr | 60% | 15,708 psi | 42% | 1483 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 27,050 psi | 73% | 1775 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 21,683 psi | 59% | 1542 fps | 100% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 8,108 psi | 22% | 1106 fps | 99.9% |
| Hodgdon Universal² | <<locked>> | 60% | 26,266 psi | 71% | 1831 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 25,947 psi | 70% | 1844 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 20,624 psi | 56% | 1667 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 22,553 psi | 61% | 1726 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 23,409 psi | 63% | 1716 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 25,063 psi | 68% | 1732 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 28,224 psi | 76% | 1736 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 29,849 psi | 81% | 1867 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 7,614 psi | 21% | 1096 fps | 97.5% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 20,726 psi | 56% | 1745 fps | 99.9% |
| ReloadSwiss RS 24*² | <<locked>> | 72% | 28,732 psi | 78% | 2014 fps | 87.1% |
| Rottweil P 806*² | <<locked>> | 60% | 16,041 psi | 43% | 1634 fps | 87.7% |
| SNPE Vectan A0² | <<locked>> | 60% | 20,784 psi | 56% | 1693 fps | 99.3% |
| SNPE Vectan A1² | <<locked>> | 60% | 25,730 psi | 70% | 1775 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 24,889 psi | 67% | 1778 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 29,356 psi | 79% | 1713 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 60% | 17,796 psi | 48% | 1621 fps | 91.3% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 24,598 psi | 67% | 1781 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 23,946 psi | 65% | 1906 fps | 91.6% |
| Somchem MP200² | <<locked>> | 60% | 25,541 psi | 69% | 1864 fps | 99.9% |
| Somchem MS200² | <<locked>> | 60% | 23,235 psi | 63% | 1781 fps | 100% |
| Somchem S221*² | <<locked>> | 60% | 28,819 psi | 78% | 1991 fps | 90.7% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 20,494 psi | 55% | 1745 fps | 94.7% |
| Vihtavuori 3N38* | <<locked>> | 80% | 25,512 psi | 69% | 1913 fps | 85.7% |
| Vihtavuori N105* | <<locked>> | 80% | 21,422 psi | 58% | 1854 fps | 86.1% |
| Vihtavuori N320² | <<locked>> | 60% | 26,774 psi | 72% | 1778 fps | 100% |
| Vihtavuori N32C Tin Star² | 8 gr | 60% | 13,750 psi | 37% | 1342 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 25,744 psi | 70% | 1821 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 22,437 psi | 61% | 1762 fps | 99.8% |
| Vihtavuori N350*² | <<locked>> | 60% | 17,811 psi | 48% | 1647 fps | 92.8% |
| Winchester AutoComp ² | <<locked>> | 60% | 21,741 psi | 59% | 1709 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
* not dangerous but load has suboptimal powder burnt with possible characteristics such as extensive muzzle flash or inaccurate loads.
² fill rate low - you might want to consider using a filler to ensure proper ignition.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 51 powders for .357 Auto Mag. loaded with the .358 | 80gr | Rim Rock DEWC. Vihtavuori N105 delivers the highest muzzle velocity at 2,133 fps; across all powders the maximum-charge window runs from 1,486 fps to 2,133 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 11 of the 51 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 44–90 %, leaving at least 10 % headroom. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori N32C Tin Star 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 Herco, Baschieri & Pellagri 102 Pistol, Vihtavuori N32C Tin Star rank at the top here: for .357 Auto Mag. with the .358 | 80gr | Rim Rock DEWC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant POWER PISTOL, ReloadSwiss RS 24, Somchem S221 burn incompletely and react more sensitively to barrel length and temperature. Hodgdon TrailBoss, ReloadSwiss RS 14 stay subsonic at start load. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.