Load Specifications
Load data in caliber .357 Auto Mag. with .356 | 125gr | Rim Rock CN bullet and 47 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% | 32,489 psi | 88% | 1552 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 31,531 psi | 85% | 1690 fps | 93.1% |
| Accurate Solo 1000² | <<locked>> | 64% | 31,705 psi | 86% | 1424 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 31,459 psi | 85% | 1483 fps | 100% |
| Accurate TCM*² | <<locked>> | 72% | 31,894 psi | 86% | 1683 fps | 89.2% |
| ADI AP 100 | <<locked>> | 84% | 33,417 psi | 90% | 1667 fps | 99.5% |
| ADI APS 350² | <<locked>> | 64% | 32,430 psi | 88% | 1322 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 31,502 psi | 85% | 1342 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 31,183 psi | 84% | 1381 fps | 100% |
| Alliant BE-86² | <<locked>> | 68% | 32,895 psi | 89% | 1486 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 84% | 32,372 psi | 88% | 1696 fps | 92.5% |
| Alliant Green Dot² | <<locked>> | 64% | 31,009 psi | 84% | 1430 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 31,720 psi | 86% | 1562 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 32,518 psi | 88% | 1696 fps | 99% |
| Alliant RED DOT² | <<locked>> | 68% | 33,214 psi | 90% | 1430 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 32,155 psi | 87% | 1572 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 31,227 psi | 84% | 1421 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 30,864 psi | 83% | 1424 fps | 100% |
| Hodgdon Clays² | <<locked>> | 64% | 33,083 psi | 89% | 1345 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 20,030 psi | 54% | 1181 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 31,531 psi | 85% | 1690 fps | 93.1% |
| Lovex D037.2*² | <<locked>> | 72% | 32,619 psi | 88% | 1699 fps | 88.2% |
| Maxam CSB 1² | <<locked>> | 72% | 32,634 psi | 88% | 1493 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 32,808 psi | 89% | 1490 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 33,170 psi | 90% | 1476 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 31,386 psi | 85% | 1427 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 18,855 psi | 51% | 1198 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 31,488 psi | 85% | 1552 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 29,950 psi | 81% | 1644 fps | 94.4% |
| Rottweil P 806² | <<locked>> | 72% | 30,864 psi | 83% | 1663 fps | 100% |
| Shooters World Heavy Pistol*² | <<locked>> | 72% | 32,619 psi | 88% | 1699 fps | 88.2% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 31,531 psi | 85% | 1690 fps | 93.1% |
| SNPE Vectan A0² | <<locked>> | 72% | 33,112 psi | 90% | 1542 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 32,634 psi | 88% | 1480 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 31,879 psi | 86% | 1493 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 32,547 psi | 88% | 1604 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 31,169 psi | 84% | 1483 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 64% | 32,924 psi | 89% | 1703 fps | 99.8% |
| Somchem MP200² | <<locked>> | 64% | 33,170 psi | 90% | 1581 fps | 100% |
| Somchem MS200² | <<locked>> | 68% | 33,402 psi | 90% | 1558 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 31,270 psi | 85% | 1601 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 80% | 30,487 psi | 82% | 1644 fps | 95.5% |
| Vihtavuori N105 | <<locked>> | 84% | 30,618 psi | 83% | 1699 fps | 98.5% |
| Vihtavuori N32C Tin Star | <<locked>> | 92% | 31,691 psi | 86% | 1352 fps | 100% |
| Vihtavuori N340² | <<locked>> | 68% | 33,199 psi | 90% | 1558 fps | 100% |
| Vihtavuori N350² | <<locked>> | 72% | 30,443 psi | 82% | 1581 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 31,169 psi | 84% | 1493 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% | 28,268 psi | 76% | 1480 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 26,832 psi | 73% | 1591 fps | 90.4% |
| Accurate Solo 1000² | <<locked>> | 60% | 28,224 psi | 76% | 1368 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 25,440 psi | 69% | 1381 fps | 100% |
| Accurate TCM*² | <<locked>> | 68% | 27,731 psi | 75% | 1598 fps | 86.6% |
| ADI AP 100*² | <<locked>> | 60% | 17,027 psi | 46% | 1286 fps | 91.6% |
| ADI APS 350² | <<locked>> | 60% | 29,327 psi | 79% | 1273 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 28,616 psi | 77% | 1296 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 28,224 psi | 76% | 1332 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 25,933 psi | 70% | 1375 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 72% | 23,018 psi | 62% | 1483 fps | 86.2% |
| Alliant Green Dot² | <<locked>> | 60% | 28,166 psi | 76% | 1385 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 18,840 psi | 51% | 1299 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 25,106 psi | 68% | 1535 fps | 96.4% |
| Alliant RED DOT² | <<locked>> | 60% | 27,180 psi | 73% | 1335 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 25,976 psi | 70% | 1463 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 27,847 psi | 75% | 1368 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 18,217 psi | 49% | 1198 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 29,907 psi | 81% | 1296 fps | 100% |
| Hodgdon TrailBoss² | 4.9 gr | 60% | 9,181 psi | 25% | 886 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 26,832 psi | 73% | 1591 fps | 90.4% |
| Lovex D037.2*² | <<locked>> | 68% | 27,992 psi | 76% | 1608 fps | 85.3% |
| Maxam CSB 1² | <<locked>> | 60% | 23,844 psi | 64% | 1345 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 26,208 psi | 71% | 1385 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 27,006 psi | 73% | 1378 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 28,500 psi | 77% | 1381 fps | 100% |
| ReloadSwiss RS 14² | 5 gr | 60% | 8,702 psi | 24% | 889 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 24,337 psi | 66% | 1427 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 23,134 psi | 63% | 1486 fps | 90.1% |
| Rottweil P 806² | <<locked>> | 60% | 20,233 psi | 55% | 1434 fps | 98% |
| Shooters World Heavy Pistol*² | <<locked>> | 68% | 27,992 psi | 76% | 1608 fps | 85.3% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 26,832 psi | 73% | 1591 fps | 90.4% |
| SNPE Vectan A0² | <<locked>> | 60% | 23,757 psi | 64% | 1378 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 29,051 psi | 79% | 1424 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 28,297 psi | 77% | 1434 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 20,798 psi | 56% | 1365 fps | 98.6% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 27,978 psi | 76% | 1430 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 28,921 psi | 78% | 1624 fps | 99.1% |
| Somchem MP200² | <<locked>> | 60% | 29,486 psi | 80% | 1522 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 26,614 psi | 72% | 1444 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 24,381 psi | 66% | 1467 fps | 99.9% |
| Vihtavuori 3N38*² | <<locked>> | 64% | 18,695 psi | 51% | 1362 fps | 87.2% |
| Vihtavuori N105*² | <<locked>> | 64% | 15,838 psi | 43% | 1325 fps | 88.1% |
| Vihtavuori N32C Tin Star² | 6.7 gr | 60% | 15,737 psi | 43% | 1063 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 26,237 psi | 71% | 1444 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 21,045 psi | 57% | 1388 fps | 99.4% |
| Winchester AutoComp ² | <<locked>> | 60% | 24,743 psi | 67% | 1381 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 47 powders for .357 Auto Mag. loaded with the .356 | 125gr | Rim Rock CN. SNPE Vectan SP 2 delivers the highest muzzle velocity at 1,703 fps; across all powders the maximum-charge window runs from 1,181 fps to 1,703 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 9 of the 47 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 51–90 %, 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 | 125gr | Rim Rock CN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 7, Accurate TCM, Alliant BLUE DOT burn incompletely and react more sensitively to barrel length and temperature. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori N32C Tin Star 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.