Load Specifications
Load data in caliber .357 Auto Mag. with .358 | 148gr | Rim Rock WC bullet and 40 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% | 30,966 psi | 84% | 1542 fps | 90.5% |
| Accurate Solo 1000² | <<locked>> | 64% | 33,431 psi | 90% | 1316 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 64% | 30,792 psi | 83% | 1335 fps | 100% |
| Accurate TCM*² | <<locked>> | 68% | 31,386 psi | 85% | 1545 fps | 92% |
| ADI AP 100 | <<locked>> | 80% | 33,141 psi | 90% | 1519 fps | 100% |
| ADI APS 350² | <<locked>> | 64% | 33,431 psi | 90% | 1214 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 32,619 psi | 88% | 1237 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 32,692 psi | 88% | 1273 fps | 100% |
| Alliant BE-86² | <<locked>> | 64% | 32,068 psi | 87% | 1339 fps | 100% |
| Alliant BLUE DOT | <<locked>> | 80% | 32,416 psi | 88% | 1565 fps | 95.1% |
| Alliant Green Dot² | <<locked>> | 64% | 33,431 psi | 90% | 1329 fps | 100% |
| Alliant Herco² | <<locked>> | 76% | 31,401 psi | 85% | 1414 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 64% | 32,169 psi | 87% | 1545 fps | 99.8% |
| Alliant RED DOT² | <<locked>> | 64% | 32,343 psi | 87% | 1286 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 64% | 31,415 psi | 85% | 1417 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 33,272 psi | 90% | 1316 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 33,156 psi | 90% | 1322 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 21,857 psi | 59% | 1102 fps | 100% |
| Lovex D037.2*² | <<locked>> | 68% | 31,821 psi | 86% | 1558 fps | 91% |
| Maxam CSB 1² | <<locked>> | 68% | 32,126 psi | 87% | 1348 fps | 100% |
| Maxam CSB 2² | <<locked>> | 64% | 32,430 psi | 88% | 1345 fps | 100% |
| Maxam CSB 3² | <<locked>> | 64% | 32,271 psi | 87% | 1325 fps | 100% |
| Ramshot Enforcer*² | <<locked>> | 76% | 29,718 psi | 80% | 1549 fps | 88% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 20,711 psi | 56% | 1119 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 64% | 30,458 psi | 82% | 1391 fps | 100% |
| ReloadSwiss RS 24² | <<locked>> | 64% | 29,704 psi | 80% | 1506 fps | 96.6% |
| Rottweil P 806² | <<locked>> | 68% | 30,777 psi | 83% | 1516 fps | 100% |
| Shooters World Heavy Pistol*² | <<locked>> | 68% | 31,821 psi | 86% | 1558 fps | 91% |
| SNPE Vectan A0² | <<locked>> | 68% | 32,314 psi | 87% | 1391 fps | 100% |
| SNPE Vectan BA6 1/2*ᴾ | <<locked>> | 100% | 27,340 psi | 74% | 1493 fps | 89% |
| SNPE Vectan BA7 1/2² | <<locked>> | 72% | 32,532 psi | 88% | 1463 fps | 100% |
| Somchem MS200² | <<locked>> | 64% | 32,503 psi | 88% | 1404 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 64% | 30,835 psi | 83% | 1450 fps | 100% |
| Vihtavuori 3N38² | <<locked>> | 76% | 30,835 psi | 83% | 1516 fps | 97.7% |
| Vihtavuori N105 | <<locked>> | 80% | 31,183 psi | 84% | 1562 fps | 99.7% |
| Vihtavuori N110* | <<locked>> | 96% | 30,327 psi | 82% | 1578 fps | 87.8% |
| Vihtavuori N32C Tin Star | <<locked>> | 88% | 31,517 psi | 85% | 1224 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 32,401 psi | 88% | 1404 fps | 100% |
| Vihtavuori N350² | <<locked>> | 68% | 30,400 psi | 82% | 1437 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 64% | 30,560 psi | 83% | 1345 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>> | 60% | 23,235 psi | 63% | 1381 fps | 85.1% |
| Accurate Solo 1000² | <<locked>> | 60% | 30,371 psi | 82% | 1270 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 27,412 psi | 74% | 1283 fps | 100% |
| Accurate TCM*² | <<locked>> | 60% | 23,540 psi | 64% | 1385 fps | 86.8% |
| ADI AP 100² | <<locked>> | 60% | 19,116 psi | 52% | 1237 fps | 96.1% |
| ADI APS 350² | <<locked>> | 60% | 30,864 psi | 83% | 1178 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 29,675 psi | 80% | 1194 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 29,646 psi | 80% | 1230 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 28,485 psi | 77% | 1286 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 64% | 20,479 psi | 55% | 1306 fps | 87.4% |
| Alliant Green Dot² | <<locked>> | 60% | 29,878 psi | 81% | 1280 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 20,871 psi | 56% | 1224 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 28,210 psi | 76% | 1473 fps | 99.2% |
| Alliant RED DOT² | <<locked>> | 60% | 29,240 psi | 79% | 1240 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 28,195 psi | 76% | 1365 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 29,675 psi | 80% | 1266 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 20,102 psi | 54% | 1119 fps | 100% |
| Hodgdon TrailBoss² | 4.9 gr | 60% | 10,066 psi | 27% | 827 fps | 100% |
| Lovex D037.2*² | <<locked>> | 60% | 23,598 psi | 64% | 1388 fps | 85.4% |
| Maxam CSB 1² | <<locked>> | 60% | 25,657 psi | 69% | 1250 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 28,993 psi | 78% | 1293 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 28,805 psi | 78% | 1276 fps | 100% |
| Ramshot Enforcer*² | <<locked>> | 72% | 25,802 psi | 70% | 1470 fps | 85.3% |
| ReloadSwiss RS 14² | 5 gr | 60% | 9,573 psi | 26% | 837 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 27,238 psi | 74% | 1342 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 25,846 psi | 70% | 1430 fps | 94.8% |
| Rottweil P 806² | <<locked>> | 60% | 23,308 psi | 63% | 1381 fps | 99.9% |
| Shooters World Heavy Pistol*² | <<locked>> | 60% | 23,598 psi | 64% | 1388 fps | 85.4% |
| SNPE Vectan A0² | <<locked>> | 60% | 26,150 psi | 71% | 1296 fps | 100% |
| SNPE Vectan BA6 1/2* | <<locked>> | 96% | 24,540 psi | 66% | 1434 fps | 86.8% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 22,756 psi | 62% | 1289 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 28,689 psi | 78% | 1345 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 26,934 psi | 73% | 1385 fps | 100% |
| Vihtavuori 3N38*² | <<locked>> | 60% | 18,652 psi | 50% | 1247 fps | 90.4% |
| Vihtavuori N105*² | <<locked>> | 60% | 15,780 psi | 43% | 1214 fps | 91.5% |
| Vihtavuori N110* | <<locked>> | 92% | 26,977 psi | 73% | 1509 fps | 85.5% |
| Vihtavuori N32C Tin Star² | 6.7 gr | 60% | 17,202 psi | 47% | 991 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 28,514 psi | 77% | 1345 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 23,685 psi | 64% | 1319 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 27,195 psi | 74% | 1296 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 40 powders for .357 Auto Mag. loaded with the .358 | 148gr | Rim Rock WC. Vihtavuori N110 delivers the highest muzzle velocity at 1,578 fps; across all powders the maximum-charge window runs from 1,102 fps to 1,578 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 9 of the 40 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 56–90 %, 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 .358 | 148gr | Rim Rock WC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 9, Accurate TCM, Lovex D037.2 burn incompletely and react more sensitively to barrel length and temperature. Baschieri & Pellagri 102 Pistol, 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.