Load Specifications
Load data in caliber .357 Mag. with .358 | 148gr | Rim Rock SWC bullet and 66 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N105, Vihtavuori 3N38 and ADI AP 100.
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"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 72% | 36,999 psi | 85% | 1325 fps | 100% |
| Accurate No. 7*² | <<locked>> | 72% | 34,853 psi | 80% | 1453 fps | 93.3% |
| Accurate Solo 1000² | <<locked>> | 76% | 38,130 psi | 88% | 1237 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 80% | 38,638 psi | 89% | 1299 fps | 100% |
| Accurate TCM* | <<locked>> | 80% | 34,476 psi | 79% | 1434 fps | 88.9% |
| ADI AP 100 | <<locked>> | 96% | 38,435 psi | 88% | 1444 fps | 99.7% |
| ADI AP 70N² | <<locked>> | 64% | 35,853 psi | 82% | 1286 fps | 100% |
| ADI APS 350² | <<locked>> | 72% | 36,622 psi | 84% | 1122 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 37,985 psi | 87% | 1168 fps | 100% |
| ADI AS 30² | <<locked>> | 76% | 38,000 psi | 87% | 1207 fps | 100% |
| ADI AS 50N² | <<locked>> | 72% | 37,536 psi | 86% | 1247 fps | 100% |
| Alliant BE-86² | <<locked>> | 76% | 36,608 psi | 84% | 1266 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 96% | 37,768 psi | 87% | 1483 fps | 93.4% |
| Alliant BULLSEYE² | <<locked>> | 68% | 35,795 psi | 82% | 1339 fps | 100% |
| Alliant Green Dot² | <<locked>> | 76% | 37,913 psi | 87% | 1253 fps | 100% |
| Alliant Herco | <<locked>> | 92% | 36,405 psi | 84% | 1348 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 76% | 35,085 psi | 81% | 1440 fps | 99% |
| Alliant RED DOT² | <<locked>> | 76% | 35,926 psi | 83% | 1204 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 64% | 36,709 psi | 84% | 1355 fps | 100% |
| Alliant UNIQUE | <<locked>> | 80% | 38,667 psi | 89% | 1381 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 76% | 38,305 psi | 88% | 1243 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 92% | 36,085 psi | 83% | 1234 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 72% | 38,638 psi | 89% | 1266 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 76% | 38,827 psi | 89% | 1312 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 37,289 psi | 86% | 1138 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 64% | 36,622 psi | 84% | 1394 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 18,347 psi | 42% | 945 fps | 100% |
| Hodgdon Universal² | <<locked>> | 72% | 36,753 psi | 84% | 1296 fps | 100% |
| Lovex D037.1*² | <<locked>> | 72% | 34,853 psi | 80% | 1453 fps | 93.3% |
| Lovex D037.2* | <<locked>> | 80% | 35,157 psi | 81% | 1447 fps | 87.8% |
| Lovex S011² | <<locked>> | 64% | 37,159 psi | 85% | 1257 fps | 100% |
| Lovex S020² | <<locked>> | 72% | 38,696 psi | 89% | 1332 fps | 100% |
| Maxam CSB 1 | <<locked>> | 84% | 39,015 psi | 90% | 1299 fps | 100% |
| Maxam CSB 2 | <<locked>> | 80% | 39,146 psi | 90% | 1299 fps | 100% |
| Maxam CSB 3² | <<locked>> | 76% | 36,114 psi | 83% | 1247 fps | 100% |
| Maxam CSB 4² | <<locked>> | 76% | 38,783 psi | 89% | 1253 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 39,001 psi | 90% | 1207 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 64% | 36,434 psi | 84% | 1355 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 68% | 37,898 psi | 87% | 1270 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 16,882 psi | 39% | 951 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 80% | 37,318 psi | 86% | 1355 fps | 100% |
| ReloadSwiss RS 24 | <<locked>> | 80% | 36,753 psi | 84% | 1467 fps | 96.1% |
| Rottweil P 801² | <<locked>> | 64% | 37,811 psi | 87% | 1240 fps | 100% |
| Rottweil P 806 | <<locked>> | 84% | 36,666 psi | 84% | 1473 fps | 100% |
| Shooters World Heavy Pistol* | <<locked>> | 80% | 35,157 psi | 81% | 1447 fps | 87.8% |
| Shooters World Major Pistol*² | <<locked>> | 72% | 34,853 psi | 80% | 1453 fps | 93.3% |
| SNPE Vectan A0 | <<locked>> | 80% | 36,274 psi | 83% | 1309 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 72% | 35,955 psi | 83% | 1253 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 76% | 39,233 psi | 90% | 1312 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 38,899 psi | 89% | 1178 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 88% | 38,566 psi | 89% | 1398 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 76% | 38,261 psi | 88% | 1306 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 72% | 36,056 psi | 83% | 1460 fps | 99.8% |
| Somchem MP200² | <<locked>> | 72% | 36,593 psi | 84% | 1348 fps | 100% |
| Somchem MS200² | <<locked>> | 76% | 36,506 psi | 84% | 1322 fps | 100% |
| Somchem S221² | <<locked>> | 68% | 37,956 psi | 87% | 1457 fps | 98.4% |
| Vihtavuori 3N37 | <<locked>> | 80% | 38,319 psi | 88% | 1414 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 92% | 38,595 psi | 89% | 1476 fps | 97.2% |
| Vihtavuori N105 | <<locked>> | 96% | 35,288 psi | 81% | 1483 fps | 99% |
| Vihtavuori N320² | <<locked>> | 72% | 37,739 psi | 87% | 1247 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 38,464 psi | 88% | 1178 fps | 100% |
| Vihtavuori N330² | <<locked>> | 72% | 35,621 psi | 82% | 1280 fps | 100% |
| Vihtavuori N340² | <<locked>> | 76% | 36,013 psi | 83% | 1319 fps | 100% |
| Vihtavuori N350 | <<locked>> | 84% | 39,131 psi | 90% | 1417 fps | 100% |
| Winchester 231² | <<locked>> | 64% | 39,073 psi | 90% | 1296 fps | 100% |
| Winchester AutoComp | <<locked>> | 80% | 37,869 psi | 87% | 1309 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 60% | 25,498 psi | 59% | 1175 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 22,481 psi | 52% | 1234 fps | 85.8% |
| Accurate Solo 1000² | <<locked>> | 60% | 26,121 psi | 60% | 1089 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 22,379 psi | 51% | 1089 fps | 100% |
| Accurate TCM*² | <<locked>> | 76% | 30,037 psi | 69% | 1362 fps | 86.5% |
| ADI AP 100*² | 6.8 gr | 60% | 14,794 psi | 34% | 1001 fps | 88% |
| ADI AP 70N² | <<locked>> | 60% | 31,662 psi | 73% | 1234 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 27,412 psi | 63% | 1010 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 26,818 psi | 62% | 1033 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 25,744 psi | 59% | 1056 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 28,021 psi | 64% | 1129 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 22,989 psi | 53% | 1089 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 80% | 24,424 psi | 56% | 1260 fps | 86% |
| Alliant BULLSEYE² | <<locked>> | 60% | 29,066 psi | 67% | 1247 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 25,382 psi | 58% | 1096 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 16,578 psi | 38% | 1024 fps | 99.8% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 21,567 psi | 50% | 1198 fps | 93.5% |
| Alliant RED DOT² | <<locked>> | 60% | 24,671 psi | 57% | 1056 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 32,474 psi | 75% | 1302 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 22,887 psi | 53% | 1155 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 24,831 psi | 57% | 1079 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 16,114 psi | 37% | 948 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 27,108 psi | 62% | 1135 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 25,193 psi | 58% | 1142 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 27,891 psi | 64% | 1027 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 32,271 psi | 74% | 1335 fps | 100% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 8,224 psi | 19% | 699 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 27,079 psi | 62% | 1168 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 22,481 psi | 52% | 1234 fps | 85.8% |
| Lovex D037.2*² | <<locked>> | 76% | 30,632 psi | 70% | 1378 fps | 85.4% |
| Lovex S011² | <<locked>> | 60% | 32,605 psi | 75% | 1204 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 26,701 psi | 61% | 1184 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 21,451 psi | 49% | 1066 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 23,018 psi | 53% | 1096 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 24,091 psi | 55% | 1089 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 25,889 psi | 60% | 1096 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 28,834 psi | 66% | 1089 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 31,879 psi | 73% | 1296 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 30,052 psi | 69% | 1178 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 7,847 psi | 18% | 705 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 20,972 psi | 48% | 1125 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 19,653 psi | 45% | 1152 fps | 85.8% |
| Rottweil P 801² | <<locked>> | 60% | 33,518 psi | 77% | 1191 fps | 100% |
| Rottweil P 806*² | <<locked>> | 60% | 16,201 psi | 37% | 1112 fps | 94.8% |
| Shooters World Heavy Pistol*² | <<locked>> | 76% | 30,632 psi | 70% | 1378 fps | 85.4% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 22,481 psi | 52% | 1234 fps | 85.8% |
| SNPE Vectan A0² | <<locked>> | 60% | 20,885 psi | 48% | 1083 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 26,339 psi | 61% | 1135 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 25,498 psi | 59% | 1138 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 29,211 psi | 67% | 1066 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 18,275 psi | 42% | 1070 fps | 96.7% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 24,961 psi | 57% | 1132 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 24,352 psi | 56% | 1266 fps | 96.9% |
| Somchem MP200² | <<locked>> | 60% | 26,194 psi | 60% | 1204 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 23,873 psi | 55% | 1145 fps | 100% |
| Somchem S221² | <<locked>> | 60% | 28,674 psi | 66% | 1316 fps | 95.4% |
| Vihtavuori 3N37² | <<locked>> | 60% | 20,697 psi | 48% | 1145 fps | 98.7% |
| Vihtavuori 3N38*² | 9.1 gr | 68% | 18,724 psi | 43% | 1129 fps | 86.1% |
| Vihtavuori N105*² | 8.8 gr | 68% | 14,779 psi | 34% | 1073 fps | 85.5% |
| Vihtavuori N320² | <<locked>> | 60% | 26,919 psi | 62% | 1115 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 15,896 psi | 37% | 879 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 25,614 psi | 59% | 1155 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 23,018 psi | 53% | 1138 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 19,087 psi | 44% | 1109 fps | 98.3% |
| Winchester 231² | <<locked>> | 60% | 34,679 psi | 80% | 1247 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 22,191 psi | 51% | 1099 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 13 powders for .357 Mag. loaded with the .358 | 148gr | Rim Rock SWC. Alliant BLUE DOT delivers the highest muzzle velocity at 1,483 fps; across all powders the maximum-charge window runs from 945 fps to 1,483 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 13 of the 13 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (300 MPa), the top charges use 39–90 %, 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. Vihtavuori N105, Vihtavuori 3N38, ADI AP 100 rank at the top here: for .357 Mag. with the .358 | 148gr | Rim Rock SWC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, 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.