Load Specifications
Load data in caliber .357 Auto Mag. with .356 | 95gr | Rim Rock RN bullet and 48 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N32C Tin Star, 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 ≥ 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>> | 64% | 30,327 psi | 82% | 1785 fps | 100% |
| Accurate Solo 1000² | <<locked>> | 68% | 33,373 psi | 90% | 1716 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 72% | 33,344 psi | 90% | 1785 fps | 100% |
| ADI AP 100 | <<locked>> | 84% | 30,821 psi | 83% | 1880 fps | 97.1% |
| ADI APS 350² | <<locked>> | 64% | 31,343 psi | 85% | 1552 fps | 100% |
| ADI APS 450² | <<locked>> | 68% | 32,880 psi | 89% | 1614 fps | 100% |
| ADI AS 30² | <<locked>> | 68% | 32,358 psi | 87% | 1660 fps | 100% |
| ADI AS 50N² | <<locked>> | 64% | 32,430 psi | 88% | 1719 fps | 100% |
| Alliant BE-86² | <<locked>> | 68% | 31,067 psi | 84% | 1722 fps | 100% |
| Alliant Green Dot² | <<locked>> | 68% | 32,518 psi | 88% | 1726 fps | 100% |
| Alliant Herco | <<locked>> | 84% | 32,648 psi | 88% | 1850 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 30,052 psi | 81% | 1909 fps | 95.9% |
| Alliant RED DOT² | <<locked>> | 68% | 31,531 psi | 85% | 1670 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 30,269 psi | 82% | 1818 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 68% | 32,619 psi | 88% | 1709 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 84% | 31,763 psi | 86% | 1696 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 64% | 32,605 psi | 88% | 1713 fps | 100% |
| Hodgdon Clays² | <<locked>> | 76% | 32,996 psi | 89% | 1614 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 18,811 psi | 51% | 1375 fps | 100% |
| Hodgdon Universal² | <<locked>> | 64% | 31,357 psi | 85% | 1765 fps | 100% |
| Lovex S020² | <<locked>> | 64% | 32,053 psi | 87% | 1801 fps | 100% |
| Maxam CSB 1² | <<locked>> | 72% | 31,053 psi | 84% | 1739 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 30,792 psi | 83% | 1729 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 31,343 psi | 85% | 1716 fps | 100% |
| Maxam CSB 4² | <<locked>> | 68% | 33,388 psi | 90% | 1726 fps | 100% |
| Maxam CSB 5² | <<locked>> | 64% | 32,663 psi | 88% | 1654 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 17,521 psi | 47% | 1385 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 72% | 32,300 psi | 87% | 1844 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 72% | 31,589 psi | 85% | 1932 fps | 91.7% |
| Rottweil P 806² | <<locked>> | 76% | 32,227 psi | 87% | 1949 fps | 99.7% |
| SNPE Vectan A0² | <<locked>> | 72% | 30,864 psi | 83% | 1778 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 30,487 psi | 82% | 1709 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 68% | 33,315 psi | 90% | 1788 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 64% | 33,359 psi | 90% | 1624 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 30,472 psi | 82% | 1831 fps | 99.6% |
| SNPE Vectan BA9 1/2² | <<locked>> | 68% | 32,692 psi | 88% | 1781 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 64% | 30,197 psi | 82% | 1919 fps | 97.4% |
| Somchem MP200² | <<locked>> | 64% | 31,140 psi | 84% | 1824 fps | 100% |
| Somchem MS200² | <<locked>> | 68% | 31,444 psi | 85% | 1804 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 72% | 32,924 psi | 89% | 1903 fps | 100% |
| Vihtavuori 3N38* | <<locked>> | 84% | 31,720 psi | 86% | 1923 fps | 92.7% |
| Vihtavuori N105 | <<locked>> | 88% | 31,140 psi | 84% | 1969 fps | 96% |
| Vihtavuori N320² | <<locked>> | 64% | 32,184 psi | 87% | 1709 fps | 100% |
| Vihtavuori N32C Tin Star | <<locked>> | 96% | 32,300 psi | 87% | 1611 fps | 100% |
| Vihtavuori N330² | <<locked>> | 64% | 31,850 psi | 86% | 1775 fps | 100% |
| Vihtavuori N340² | <<locked>> | 68% | 30,879 psi | 83% | 1795 fps | 100% |
| Vihtavuori N350² | <<locked>> | 76% | 31,966 psi | 86% | 1877 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 72% | 32,561 psi | 88% | 1785 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% | 26,803 psi | 72% | 1713 fps | 100% |
| Accurate Solo 1000² | <<locked>> | 60% | 26,890 psi | 73% | 1598 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 23,859 psi | 65% | 1598 fps | 100% |
| ADI AP 100*² | <<locked>> | 60% | 15,838 psi | 43% | 1444 fps | 85.9% |
| ADI APS 350² | <<locked>> | 60% | 28,166 psi | 76% | 1496 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 27,398 psi | 74% | 1516 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 26,803 psi | 72% | 1555 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 28,877 psi | 78% | 1654 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 24,395 psi | 66% | 1594 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 26,672 psi | 72% | 1611 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 17,405 psi | 47% | 1473 fps | 99.2% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 23,235 psi | 63% | 1726 fps | 91.8% |
| Alliant RED DOT² | <<locked>> | 60% | 25,947 psi | 70% | 1562 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 23,873 psi | 65% | 1670 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 26,281 psi | 71% | 1591 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 17,129 psi | 46% | 1388 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 28,703 psi | 78% | 1647 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 22,698 psi | 61% | 1417 fps | 100% |
| Hodgdon TrailBoss² | 5.7 gr | 60% | 8,746 psi | 24% | 1033 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 28,094 psi | 76% | 1703 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 28,137 psi | 76% | 1729 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 22,423 psi | 61% | 1558 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 24,352 psi | 66% | 1604 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 25,237 psi | 68% | 1598 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 26,890 psi | 73% | 1608 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 29,472 psi | 80% | 1594 fps | 100% |
| ReloadSwiss RS 14² | 5.8 gr | 60% | 8,224 psi | 22% | 1030 fps | 99.5% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 22,698 psi | 61% | 1644 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 64% | 24,308 psi | 66% | 1745 fps | 86.7% |
| Rottweil P 806*² | <<locked>> | 60% | 18,115 psi | 49% | 1585 fps | 93.1% |
| SNPE Vectan A0² | <<locked>> | 60% | 22,321 psi | 60% | 1591 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 27,499 psi | 74% | 1654 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 26,672 psi | 72% | 1660 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 30,298 psi | 82% | 1572 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 19,116 psi | 52% | 1535 fps | 95.1% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 26,324 psi | 71% | 1660 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 26,179 psi | 71% | 1818 fps | 95.6% |
| Somchem MP200² | <<locked>> | 60% | 27,673 psi | 75% | 1752 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 24,932 psi | 67% | 1663 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 22,611 psi | 61% | 1663 fps | 97.9% |
| Vihtavuori 3N38*² | <<locked>> | 72% | 22,089 psi | 60% | 1673 fps | 85.9% |
| Vihtavuori N105*² | <<locked>> | 72% | 18,507 psi | 50% | 1621 fps | 86.3% |
| Vihtavuori N320² | <<locked>> | 60% | 29,008 psi | 78% | 1654 fps | 100% |
| Vihtavuori N32C Tin Star² | 7.7 gr | 60% | 14,750 psi | 40% | 1240 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 27,934 psi | 76% | 1699 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 24,236 psi | 66% | 1654 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 19,595 psi | 53% | 1575 fps | 96.6% |
| Winchester AutoComp ² | <<locked>> | 60% | 23,148 psi | 63% | 1591 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 48 powders for .357 Auto Mag. loaded with the .356 | 95gr | Rim Rock RN. Vihtavuori N105 delivers the highest muzzle velocity at 1,969 fps; across all powders the maximum-charge window runs from 1,375 fps to 1,969 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 8 of the 48 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 47–90 %, leaving at least 10 % headroom. 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. Vihtavuori N32C Tin Star, ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for .357 Auto Mag. with the .356 | 95gr | Rim Rock RN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ReloadSwiss RS 24, Vihtavuori 3N38 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.