Load Specifications
Load data in caliber .357 Auto Mag. with .356 | 147gr | Rim Rock FP bullet and 43 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. 9*² | <<locked>> | 68% | 30,182 psi | 82% | 1526 fps | 89.7% |
| Accurate Solo 1000² | <<locked>> | 64% | 33,373 psi | 90% | 1312 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 64% | 30,139 psi | 81% | 1325 fps | 100% |
| Accurate TCM*² | <<locked>> | 68% | 30,124 psi | 81% | 1522 fps | 91% |
| ADI AP 100 | <<locked>> | 80% | 32,430 psi | 88% | 1509 fps | 99.9% |
| ADI APS 350² | <<locked>> | 64% | 33,315 psi | 90% | 1211 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 32,619 psi | 88% | 1234 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 32,605 psi | 88% | 1270 fps | 100% |
| Alliant BE-86² | <<locked>> | 64% | 31,154 psi | 84% | 1325 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 80% | 31,473 psi | 85% | 1545 fps | 94.4% |
| Alliant Green Dot² | <<locked>> | 64% | 32,750 psi | 89% | 1319 fps | 100% |
| Alliant Herco² | <<locked>> | 76% | 30,560 psi | 83% | 1401 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 64% | 31,285 psi | 85% | 1529 fps | 99.6% |
| Alliant RED DOT² | <<locked>> | 64% | 31,502 psi | 85% | 1273 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 64% | 30,835 psi | 83% | 1407 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 32,648 psi | 88% | 1306 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 32,880 psi | 89% | 1319 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 32,561 psi | 88% | 1230 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 21,277 psi | 58% | 1093 fps | 100% |
| Lovex D037.2*² | <<locked>> | 68% | 31,038 psi | 84% | 1542 fps | 90.2% |
| Maxam CSB 1² | <<locked>> | 68% | 31,531 psi | 85% | 1339 fps | 100% |
| Maxam CSB 2² | <<locked>> | 64% | 31,749 psi | 86% | 1335 fps | 100% |
| Maxam CSB 3² | <<locked>> | 64% | 31,633 psi | 86% | 1316 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 33,199 psi | 90% | 1316 fps | 100% |
| Ramshot Enforcer* | <<locked>> | 80% | 32,953 psi | 89% | 1608 fps | 89.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 20,160 psi | 55% | 1109 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 33,388 psi | 90% | 1434 fps | 100% |
| ReloadSwiss RS 24² | <<locked>> | 68% | 32,895 psi | 89% | 1565 fps | 97.5% |
| Rottweil P 806² | <<locked>> | 68% | 29,762 psi | 80% | 1503 fps | 100% |
| Shooters World Heavy Pistol*² | <<locked>> | 68% | 31,038 psi | 84% | 1542 fps | 90.2% |
| SNPE Vectan A0² | <<locked>> | 68% | 31,865 psi | 86% | 1385 fps | 100% |
| SNPE Vectan BA6 1/2*ᴾ | <<locked>> | 100% | 26,092 psi | 71% | 1467 fps | 87.6% |
| SNPE Vectan BA7 1/2² | <<locked>> | 72% | 31,285 psi | 85% | 1444 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 32,895 psi | 89% | 1368 fps | 100% |
| Somchem MS200² | <<locked>> | 64% | 31,415 psi | 85% | 1388 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 64% | 29,950 psi | 81% | 1437 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 80% | 33,127 psi | 90% | 1555 fps | 98.2% |
| Vihtavuori N105 | <<locked>> | 80% | 29,878 psi | 81% | 1542 fps | 99.4% |
| Vihtavuori N110*ᴾ | <<locked>> | 100% | 32,909 psi | 89% | 1621 fps | 88.9% |
| Vihtavuori N32C Tin Star | <<locked>> | 92% | 33,272 psi | 90% | 1243 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 31,865 psi | 86% | 1398 fps | 100% |
| Vihtavuori N350² | <<locked>> | 72% | 33,272 psi | 90% | 1483 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 33,315 psi | 90% | 1385 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. 9*² | <<locked>> | 64% | 26,049 psi | 70% | 1444 fps | 86.9% |
| Accurate Solo 1000² | <<locked>> | 60% | 29,646 psi | 80% | 1260 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 26,701 psi | 72% | 1273 fps | 100% |
| Accurate TCM*² | <<locked>> | 60% | 22,713 psi | 61% | 1362 fps | 85.7% |
| ADI AP 100² | <<locked>> | 60% | 18,681 psi | 51% | 1224 fps | 95.5% |
| ADI APS 350² | <<locked>> | 60% | 30,705 psi | 83% | 1175 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 29,602 psi | 80% | 1191 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 29,428 psi | 80% | 1224 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 27,978 psi | 76% | 1280 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 64% | 19,899 psi | 54% | 1286 fps | 86.4% |
| Alliant Green Dot² | <<locked>> | 60% | 29,718 psi | 80% | 1276 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 20,349 psi | 55% | 1214 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 27,282 psi | 74% | 1453 fps | 98.8% |
| Alliant RED DOT² | <<locked>> | 60% | 28,355 psi | 77% | 1227 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 27,557 psi | 75% | 1355 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 28,979 psi | 78% | 1257 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 19,566 psi | 53% | 1109 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 25,092 psi | 68% | 1119 fps | 100% |
| Hodgdon TrailBoss² | 4.8 gr | 60% | 10,022 psi | 27% | 827 fps | 100% |
| Lovex D037.2*² | <<locked>> | 64% | 26,847 psi | 73% | 1460 fps | 87.5% |
| Maxam CSB 1² | <<locked>> | 60% | 25,498 psi | 69% | 1247 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 28,239 psi | 76% | 1283 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 28,094 psi | 76% | 1263 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 30,095 psi | 81% | 1273 fps | 100% |
| Ramshot Enforcer*² | <<locked>> | 76% | 28,514 psi | 77% | 1526 fps | 86.9% |
| ReloadSwiss RS 14² | 4.9 gr | 60% | 9,514 psi | 26% | 837 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 26,629 psi | 72% | 1332 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 25,135 psi | 68% | 1414 fps | 94.1% |
| Rottweil P 806² | <<locked>> | 60% | 22,365 psi | 60% | 1362 fps | 99.8% |
| Shooters World Heavy Pistol*² | <<locked>> | 64% | 26,847 psi | 73% | 1460 fps | 87.5% |
| SNPE Vectan A0² | <<locked>> | 60% | 25,599 psi | 69% | 1286 fps | 100% |
| SNPE Vectan BA6 1/2* | <<locked>> | 96% | 23,670 psi | 64% | 1411 fps | 85.6% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 22,350 psi | 60% | 1280 fps | 99.9% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 29,443 psi | 80% | 1319 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 28,108 psi | 76% | 1335 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 26,527 psi | 72% | 1378 fps | 100% |
| Vihtavuori 3N38*² | <<locked>> | 60% | 17,985 psi | 49% | 1230 fps | 89.4% |
| Vihtavuori N105*² | <<locked>> | 60% | 15,374 psi | 42% | 1204 fps | 90.8% |
| Vihtavuori N110* | <<locked>> | 96% | 29,153 psi | 79% | 1552 fps | 86.6% |
| Vihtavuori N32C Tin Star² | 6.5 gr | 60% | 16,911 psi | 46% | 984 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 27,905 psi | 75% | 1335 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 22,756 psi | 62% | 1302 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 26,745 psi | 72% | 1286 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 43 powders for .357 Auto Mag. loaded with the .356 | 147gr | Rim Rock FP. Vihtavuori N110 delivers the highest muzzle velocity at 1,621 fps; across all powders the maximum-charge window runs from 1,093 fps to 1,621 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 11 of the 43 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. Hodgdon TrailBoss, ReloadSwiss RS 14, SNPE Vectan BA6 1/2 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 | 147gr | Rim Rock FP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 9, Accurate TCM, Alliant BLUE DOT burn incompletely and react more sensitively to barrel length and temperature. Baschieri & Pellagri 102 Pistol, Hodgdon Clays, Hodgdon TrailBoss 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.